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BEGIN:VEVENT
SUMMARY:Zohar Komargodski
DTSTART:20200805T140000Z
DTEND:20200805T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/1
DESCRIPTION:Title: Generalized Symmetries\, Confinement\, and Naturalness\nby Zoha
r Komargodski as part of CERN Theory Colloquia\n\n\nAbstract\nWe explore v
arious generalizations of the notion of symmetry and Noether’s theorem.
We show how some new results about phases of gauge theories can be derived
from thinking about symmetries more carefully and abstractly. We provide
some examples in 2\,3\, and 4 dimensions. \nWe also make some comments on
the notion of naturalness and show how in some two-dimensional theories it
is violated.\n\nZoom connection info:\n\nhttps://cern.zoom.us/j/998781646
85?pwd=VkNWZ3phQ1ZtTkFHSkh4Z3Npd3NmZz09\n\nMeeting ID: 998 7816 4685\n\nPa
ssword: 794683\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergei Dubovsky
DTSTART:20200812T120000Z
DTEND:20200812T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/2
DESCRIPTION:Title: Integrability from confinement\nby Sergei Dubovsky as part of C
ERN Theory Colloquia\n\n\nAbstract\nIntegrable models have prominently eme
rged in the past studies of perturbative QCD. I will argue that (approxima
te) integrability\nis a natural consequence of confinement and asymptotic
freedom. I will illustrate this reasoning by two examples. First\, I will
show\nhow it leads to the ansatz for glueball quantum numbers in (2+1)-dim
ensional Yang-Mills theory. Recent lattice data\nconfirmed many prediction
s of this ansatz. Second\, I will show how this logic allowed us to lead t
o identify a remarkably simple and novel integrable relativistic N-body sy
stem\, which describes the high energy worldsheet dynamics in 2-dimensiona
l adjoint QCD.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vera Guelpers
DTSTART:20200902T120000Z
DTEND:20200902T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/3
DESCRIPTION:Title: Lattice calculations for high-precision tests of the Standard Model
of Particle Physics\nby Vera Guelpers as part of CERN Theory Colloqui
a\n\n\nAbstract\nThe LHC has not yet found any significant deviation from
the Standard Model at large energies and thus\, indirect high-precision se
arches for signatures of physics beyond the Standard Model at low energies
become more and more important. For any quantity involving the strong nuc
lear force\, the only known approach for an ab-initio treatment at low ene
rgies is Lattice QCD. In this talk I will give some examples for quantitie
s that can be used to test the Standard Model and will mainly focus on the
inclusion of electromagnetic and strong isospin breaking corrections\, wh
ich are required to further increase the precision of such lattice calcula
tions.\n\nZoom connection info:\nhttps://cern.zoom.us/j/97792556765?pwd=TV
RXTkpQKytibGN4RkxKYzJKUHhWZz09\nMeeting ID: 977 9255 6765\nPassword: 13150
6\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luciano Rezzolla
DTSTART:20201007T120000Z
DTEND:20201007T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/4
DESCRIPTION:Title: The first image of a black hole\nby Luciano Rezzolla as part of
CERN Theory Colloquia\n\n\nAbstract\nI will briefly discuss how the first
image of a black hole was obtained by the EHT collaboration. In particula
r\, I will describe the theoretical aspects that have allowed us to model
the dynamics of the plasma accreting onto the black hole and how such dyna
mics was used to generate synthetic black-hole images. I will also illustr
ate how the comparison between the theoretical images and the observations
has allowed us to deduce the presence of a black hole in M87 and to extra
ct information about its properties. Finally\, I will describe the lessons
we have learned about strong-field gravity and alternatives to black hole
s.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Volker Springel
DTSTART:20201021T120000Z
DTEND:20201021T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/5
DESCRIPTION:Title: Supercomputer insights into the messy physics of galaxy formation\nby Volker Springel as part of CERN Theory Colloquia\n\n\nAbstract\nSim
ulations of cosmic structure formation have come a long way. Nowadays\, th
ey are not only accurately predicting the dark matter backbone of the cosm
ic web and the internal structure of halos and their satellites far into t
he non-linear regime\, but are also capable of following the baryonic sect
or with rapidly improving physical fidelity. In my talk\, I will review th
e methodology and selected successes of recent hydrodynamical galaxy forma
tion simulations\, and critically discuss some of the primary uncertaintie
s in modelling strong\, scale-dependent feedback processes. I will also hi
ghlight predictions for the structure of magnetic fields in galaxies and t
he importance of cosmic rays in galaxy evolution. Finally\, I discuss some
of the challenges lying ahead in this field in the coming years.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesca Calore
DTSTART:20201028T130000Z
DTEND:20201028T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/6
DESCRIPTION:Title: Probing axion-like particles with high-energy astrophysics\nby
Francesca Calore as part of CERN Theory Colloquia\n\n\nAbstract\nAxion-lik
e particles (ALPs) are hypothetical pseudo Nambu Goldstone bosons predicte
d in numerous extensions of the standard model for Particle Physics\, and
they can represent viable dark matter candidates. Axions and ALPs could be
detected through the coupling to photons\, which would induce conversion
of ALPs into photons and back when travelling through external magnetic fi
elds. In my presentation\, I will illustrate how we can leverage on high-e
nergy astrophysics observations of Galactic and extragalactic sources to l
ook for specific imprints of the ALPs-photon coupling over a broad range o
f wavelengths\, from radio to high-energy gamma rays. I will review curren
t constraints on the ALPs parameter space\, and provide an outlook on futu
re experiments' sensitivity to ALPs discovery.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simon Caron-Huot
DTSTART:20201111T130000Z
DTEND:20201111T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/7
DESCRIPTION:Title: Gravity: The force from the UV\nby Simon Caron-Huot as part of
CERN Theory Colloquia\n\n\nAbstract\nDispersion relations are statements o
f causality. They give sum rules connecting infrared and ultraviolet physi
cs. While they originate in optics and quantum field theory\, I will argu
e that their true purpose is gravity\, due to the maximal growth rate of t
his force with energy. I will briefly discuss ongoing work on the space o
f consistent low-energy effective theories\, with preliminary results in s
calar models showing that causality turns dimensional analysis estimates i
nto sharp numerical bounds.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pedro Machado
DTSTART:20201118T130000Z
DTEND:20201118T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/8
DESCRIPTION:Title: The Large Neutrino Collider\nby Pedro Machado as part of CERN T
heory Colloquia\n\n\nAbstract\nIn this colloquium\, I will discuss aspects
that I am excited about of liquid argon time projection chambers (LArTPCs
). I will put emphasis particularly on the topological capabilities of LAr
TPCs. I will not discuss the main physics program of DUNE and the Short Ba
seline Neutrino program at Fermilab. Instead\, I will highlight novel sign
atures and search strategies that have been recently proposed in these exp
eriments and brush through several physics scenarios that can be probed in
these facilities.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Irene Tamborra
DTSTART:20201202T130000Z
DTEND:20201202T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/9
DESCRIPTION:Title: Ghostly Messengers of the Cosmos\nby Irene Tamborra as part of
CERN Theory Colloquia\n\n\nAbstract\nNeutrinos are fascinating elementary
particles heralding the dawn of the multi-messenger astronomy era. Neutrin
os affect the stellar dynamics\, drive the formation of new elements\, and
carry signatures of the yet mysterious physics ruling the most powerful c
osmic fireworks. Recent developments on the role of neutrinos in cosmic so
urces will be reviewed together with the most exciting detection prospects
.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edward Shuryak
DTSTART:20201216T130000Z
DTEND:20201216T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/10
DESCRIPTION:Title: Instantons and sphalerons of electroweak theory and QCD\nby Ed
ward Shuryak as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jeffrey Hazboun
DTSTART:20210127T130000Z
DTEND:20210127T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/11
DESCRIPTION:Title: Searching for Nanohertz Gravitational Waves with a Galactic-Scale
Detector\nby Jeffrey Hazboun as part of CERN Theory Colloquia\n\n\nAbs
tract\nPulsar timing arrays open a new band of the gravitational wave spec
trum by building a galactic-scale GW detector. They will detect a stochast
ic background of gravitational waves in the next few years. The strongest
signal is expected to be the unresolvable background from supermassive bla
ck hole binaries at the centers of merged galaxies. While SMBBHs are expec
ted to be the strongest source of GWs we are sensitive to any GW signal in
the nanohertz regime. The North American Nanohertz Observatory for Gravit
ational Waves (NANOGrav) is an NSF funded Physics Frontiers Center monitor
ing over 70 millisecond pulsars for the signature of these gravitational w
aves. In the NANOGrav 12.5-year dataset we are seeing significant evidence
for a signal in our data that is common among many of the pulsars. We cur
rently find no definitive evidence for the correlated pattern that is indi
cative of gravitational waves\, however\, if we are seeing the first signs
of the GW background our models show that continued observations will lea
d to a detection within the next few years.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ian Moult (SLAC\, Stanford)
DTSTART:20210303T150000Z
DTEND:20210303T170000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/12
DESCRIPTION:Title: Rethinking Jets: From the LHC\, to Conformal Colliders\, and Back
Again\nby Ian Moult (SLAC\, Stanford) as part of CERN Theory Colloquia
\n\n\nAbstract\nJets\, and more recently jet substructure\, have been stud
ied since the early days of QCD using observables that measure the shape o
f radiation produced in collisions. In this talk I will reformulate jet su
bstructure as the study of the near-coincidence (or operator product expan
sion (OPE)) limit of certain non-local lightray operators. This formulatio
n allows us to build a direct bridge between QCD phenomenology and recentl
y developed techniques in conformal field theory. In particular\, I will s
how that the OPE of lightray operators provides a natural expansion for je
t substructure\, and predicts rich Lorentzian scaling behavior inside jets
at the LHC\, which surprisingly has not been studied by the QCD community
. Using Open Data from the CMS experiment\, I will show that the scaling a
nd shape dependence of matrix elements of multiple lightray operators can
be directly measured at the LHC\, and exhibit a number of remarkable prope
rties. I will then describe how connections between conformal field theory
and jet substructure provide new insights into complicated calculations i
n jet substructure\, and new avenues for better understanding QCD.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pilar Coloma
DTSTART:20210317T130000Z
DTEND:20210317T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/13
DESCRIPTION:Title: New physics searches using neutrino oscillation experiments\nb
y Pilar Coloma as part of CERN Theory Colloquia\n\n\nAbstract\nIn this tal
k\, I will first give a broad introduction to neutrino oscillations\, incl
uding the current experimental status of the field as well as the main fut
ure proposals to measure neutrino properties precisely. I will then discus
s the possibilities to search for new physics using neutrino facilities\,
paying particular attention to the complementarity between oscillation and
non-oscillation experiments.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hai-Bo Yu
DTSTART:20210407T120000Z
DTEND:20210407T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/14
DESCRIPTION:Title: Self-Interacting Dark Matter\nby Hai-Bo Yu as part of CERN The
ory Colloquia\n\n\nAbstract\nIn this talk\, I will give an overview on dar
k matter distributions in galactic systems\, including spiral galaxies in
the field\, Milky Way satellite galaxies\, newly-discovered ultra diffuse
galaxies\, and galaxy clusters\, and show that they are more diverse than
predicted in the standard cold dark matter theory. Then I will show that s
elf-interacting dark matter may provide a unified explanation to the obser
ved diversity over a wide range of galactic mass scales. I will further di
scuss other astrophysical implications of self-interacting dark matter\, s
uch as the origin of supermassive black holes in the early Universe.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giovanni Villadoro
DTSTART:20210414T120000Z
DTEND:20210414T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/15
DESCRIPTION:Title: Axion Dark Matter\nby Giovanni Villadoro as part of CERN Theor
y Colloquia\n\n\nAbstract\nBesides providing a simple dynamical explanatio
n to the strong CP problem the QCD axion is also one of the most compellin
g dark matter candidate. While the presence of relic axions is almost guar
anteed if such particle exists\, a reliable computation of its abundance i
s still missing. Such information could be pivotal in both focusing the ex
perimental efforts and drawing the right theoretical conclusions in case o
f a discovery. In this talk I will review the challenges of such computati
on and the most recent developments.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreas Juettner
DTSTART:20210421T120000Z
DTEND:20210421T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/16
DESCRIPTION:Title: Towards a holographic description of cosmology on the lattice\
nby Andreas Juettner as part of CERN Theory Colloquia\n\n\nAbstract\nFollo
wing a recent proposal based on holography the physics of the very early u
niverse can be described in terms of a three-dimensional quantum field the
ory without gravity. In this model cosmological observables are expressed
in terms of correlation functions of the energy-momentum tensor computed i
n the QFT. Testing the model against observational data\, e.g. from Planck
\, requires control over the non-perturbative dynamics in the QFT\, which
we address with numerical simulations on the lattice. In this talk I will
discuss our progress towards making predictions for the properties of the
CMB from our model\, which requires understanding the IR properties of 3d
super-renormalisable QFT and the computation of 2pt functions of the energ
y-momentum tensor on the lattice.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clifford Cheung
DTSTART:20210428T143000Z
DTEND:20210428T163000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/17
DESCRIPTION:Title: From Scattering to the Dynamics of Black Holes and Fluids\nby
Clifford Cheung as part of CERN Theory Colloquia\n\n\nAbstract\nThe S-matr
ix bootstrap is a systematic framework for deriving dynamics without refer
ence to an action or an underlying spacetime. Remarkably\, the expression
s gleaned from this line of attack are marvelously simple\, revealing new
structures long hidden in plain sight. As examples\, I describe the duali
ty between color and kinematics and how gravity serves as the "mother of a
ll theories" whose S-matrix secretly encodes and unifies those of gluons\,
pions\, and Galileons. I then describe recent progress applying these id
eas to subjects somewhat less well-tread by particle physicists: gravitati
onal wave physics and fluid dynamics. First\, I discuss how cutting edge
ideas from amplitudes have been fused with classic tools from effective fi
eld theory to derive state-of-the-art results on the orbital dynamics of b
inary black holes and neutron stars. Second\, I show how the Navier-Stoke
s equation encodes scattering amplitudes of fluid quanta which are also am
enable to amplitudes analysis and exhibit a litany of familiar structures\
, including soft theorems\, recursion\, and the double copy.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christine Muschik
DTSTART:20210512T120000Z
DTEND:20210512T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/18
DESCRIPTION:Title: SU(2) hadrons on a quantum computer\nby Christine Muschik as p
art of CERN Theory Colloquia\n\n\nAbstract\nWe realize\, for the first tim
e\, a non-Abelian gauge theory with both gauge and matter fields on a quan
tum computer. This enables the observation of hadrons and the calculation
of their associated masses. The SU(2) gauge group considered here represen
ts an important first step towards ultimately studying quantum chromodynam
ics\, the theory that describes the properties of protons\, neutrons and o
ther hadrons. Quantum computers are able to create important new opportuni
ties for ongoing essential research on gauge theories by providing simulat
ions that are unattainable on classical computers. Our calculations on an
IBM superconducting platform utilize a variational quantum eigensolver to
study both meson and baryon states\, hadrons which have never been seen in
a non-Abelian simulation on a quantum computer. We develop a resource-eff
icient approach that not only allows the implementation of a full SU(2) ga
uge theory on present-day quantum hardware\, but further lays out the prem
ises for future quantum simulations that will address currently unanswered
questions in particle and nuclear physics.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laurent Lellouch
DTSTART:20210519T120000Z
DTEND:20210519T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/19
DESCRIPTION:Title: Leading hadronic contribution to the muon magnetic moment from lat
tice QCD\nby Laurent Lellouch as part of CERN Theory Colloquia\n\n\nAb
stract\nTwenty years ago in an experiment at Brookhaven National Laborator
y\, physicists measured the muon's anomalous magnetic moment\, 𝑎𝜇=(
𝑔𝜇−2)/2\, with a remarkable precision of 0.54 parts per million. S
ince then\, the standard model prediction for 𝑎𝜇 has exhibited a dis
crepancy with experiment of over 3 standard deviations\, raising the tanta
lizing possibility of physical particles or forces as yet undiscovered. On
April 7 a new experiment at Fermilab presented its first results\, brilli
antly confirming Brookhaven's measurement and bringing the discrepancy wit
h the standard model to a near discovery level of 4.2 sigma. To fully leve
rage this and future measurements\, and possibly claim the presence of new
fundamental physics\, it is imperative to check the standard model predic
tion with independent methods\, and to reduce its uncertainties. After an
introduction and a discussion of the current experimental and theoretical
status of 𝑎𝜇\, I will present a precise lattice QCD calculation\, by
the BMW collaboration\, of the contribution to this quantity that most li
mits the precision of the standard model prediction. The result of this c
alculation significantly reduces the gap between the standard model and ex
periment\, and suggests that new physics may not be needed to explain the
current\, experimental\, world-average value of 𝑎𝜇.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gian Giudice
DTSTART:20210609T120000Z
DTEND:20210609T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/20
DESCRIPTION:Title: Self-Organised Localisation\nby Gian Giudice as part of CERN T
heory Colloquia\n\n\nAbstract\nWe describe a new phenomenon in quantum cos
mology: self-organised localisation. When the fundamental parameters of a
theory are functions of a scalar field subject to large fluctuations durin
g inflation\, quantum phase transitions can act as dynamical attractors. A
s a result\, the theory parameters are probabilistically localised around
the critical value and the Universe finds itself at the edge of a phase tr
ansition. We illustrate how self-organised localisation could account for
the observed near-criticality of the Higgs self-coupling\, the naturalness
of the Higgs mass\, or the smallness of the cosmological constant.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ian Shipsey
DTSTART:20210630T120000Z
DTEND:20210630T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/21
DESCRIPTION:Title: quantum sensing\nby Ian Shipsey as part of CERN Theory Colloqu
ia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joachim Kopp
DTSTART:20210706T120000Z
DTEND:20210706T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/22
DESCRIPTION:Title: Neutrinos as a Window to New Physics\nby Joachim Kopp as part
of CERN Theory Colloquia\n\n\nAbstract\nWe discuss some of the manifold wa
ys in which physics beyond the Standard Model (SM) can manifest itself in
the neutrino sector. We begin with the dimension-4 "neutrino portal" which
leads to mixing between SM neutrino and any new singlet fermion. In this
context\, we highlight recent insights into the observed neutrino oscillat
ion anomalies\, both within the SM and beyond. At dimension-5\, we introdu
ce neutrino magnetic moments as a discovery tool for TeV-scale new physics
\, and we discuss the various terrestrial\, astrophysical\, and cosmologic
al constraints on such operators. Finally\, we consider dimension-6 operat
ors involving neutrinos in the context of Standard Model Effective Theory
(SMEFT) and its lower-energy counterparts. We demonstrate that experiments
observing LHC neutrinos\, such as FASERν and SND@LHC\, will become inter
esting players in the future.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Valerie Domcke
DTSTART:20210707T120000Z
DTEND:20210707T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/23
DESCRIPTION:Title: Cosmology with Axion-Like Particles\nby Valerie Domcke as part
of CERN Theory Colloquia\n\n\nAbstract\nAxion-like particles may play a k
ey role in early universe cosmology. They are naturally equipped with the
right properties to explain cosmic inflation\, can dynamically explain the
smallness of the electroweak scale\, may be involved in the generation of
the matter antimatter asymmetry and are promising dark matter candidates.
In this talk I discuss a generic but previously overlooked particle parti
cle production mechanism\, resulting in the dual production of gauge field
s and fermions induced by axion-like particles. I will discuss how this cr
ucially impacts all of the cosmological scenarios mentioned above and may
be probed with upcoming gravitational wave detectors.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jennifer Schober
DTSTART:20210728T120000Z
DTEND:20210728T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/24
DESCRIPTION:Title: Cosmic magnetic fields: a new window to the early Universe\nby
Jennifer Schober as part of CERN Theory Colloquia\n\n\nAbstract\nMagnetic
fields are observed on virtually all length scales of the modern Universe
\, from planets and stars to galaxies and galaxy clusters. Observations of
blazars suggest that even the intergalactic medium is permeated by magnet
ic fields. Such large-scale fields were most likely generated very shortly
after the Big Bang and therefore are a unique window into the physics of
the very early Universe.\nIn my talk\, I will review theoretical models of
magnetogenesis and confront these with observational constraints. I will
address the possible origin of magnetic fields in the very early Universe\
, during inflation and the cosmological phase transitions\, as well as the
ir pre-recombination evolution in magnetohydrodynamical (MHD) turbulence.
In particular\, I will present new results from high-resolution numerical
simulations that show an efficient amplification of magnetic energy due to
the so-called chiral anomaly\, a standard model effect that necessarily l
eads to an extension of the MHD equations at high energies.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marko Simonovic
DTSTART:20210929T120000Z
DTEND:20210929T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/25
DESCRIPTION:Title: Towards precision cosmology from large-scale structure of the univ
erse\nby Marko Simonovic as part of CERN Theory Colloquia\n\n\nAbstrac
t\nThe last decade has seen a tremendous improvement in theoretical unders
tanding of galaxy clustering on cosmological scales\, which culminated in
recent CMB-independent measurement of cosmological parameters from spectro
scopic galaxy surveys. In this talk I will review the main conceptual and
practical developments which led to this progress. I will also highlight t
he main lessons we learned so far and discuss further improvements that ha
ve to be made in order to optimally extract information from the ongoing g
alaxy surveys such as DESI and Euclid. I will conclude by arguing that in
the next couple of years the large-scale structure will become as powerful
probe of cosmology as the CMB\, and show the immense potential that the c
ombination of the two has in answering some of the open questions in cosmo
logy.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mauricio Bustamante
DTSTART:20211013T120000Z
DTEND:20211013T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/26
DESCRIPTION:Title: Pushing high-energy neutrino physics to the cosmic frontier\nb
y Mauricio Bustamante as part of CERN Theory Colloquia\n\n\nAbstract\nHigh
-energy (TeV-PeV) and ultra-high-energy (> 100 PeV) neutrinos of cosmic or
igin have a vast potential to probe neutrino physics in regimes of energy
and distance otherwise unreachable. Notable examples include precision tes
ts using the flavor composition of the neutrino flux\, new neutrino-neutri
no interactions\, and measuring the neutrino-nucleon cross section. Today\
, we are already tapping into this potential at high energies\, thanks to
spectacular discoveries by the IceCube neutrino telescope. In the coming
decade\, we may extend our reach to ultra-high energies\, thanks to an amb
itious experimental program under planning. I will survey the rich landsc
ape of high-energy physics with cosmic neutrinos\, from the perspectives o
f theory and experiment. By means of illustration\, I will campaign for t
he notion that in order for the field to mature\, we must embrace the natu
ral synergy between low-energy and high-energy neutrino experiments\, and
adopt an earnest\, comprehensive treatment of the relevant particle-physic
s and astrophysical unknowns. If we do\, then our progress\, while hard-e
arned\, could lead to transformative insight.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rebecca Leane
DTSTART:20211027T140000Z
DTEND:20211027T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/27
DESCRIPTION:Title: Detecting Dark Matter in Celestial Bodies\nby Rebecca Leane as
part of CERN Theory Colloquia\n\n\nAbstract\nStars and planets can be ide
al playgrounds to discover dark matter. In this talk\, I will review a ran
ge of dark matter searches using celestial objects\, including neutron sta
rs\, exoplanets\, solar-system planets\, and our Sun. I will discuss diffe
rent search strategies\, their opportunities and limitations\, and the int
erplay of regimes where different celestial objects are optimal detectors.
\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dorota Maria Grabowska
DTSTART:20211117T130000Z
DTEND:20211117T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/28
DESCRIPTION:Title: Applying Quantum Technology to Problems in Particle Physics\nb
y Dorota Maria Grabowska as part of CERN Theory Colloquia\n\nAbstract: TBA
\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julia Harz
DTSTART:20211124T130000Z
DTEND:20211124T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/29
DESCRIPTION:Title: Probing the properties of neutrinos and the mechanism behind the b
aryon asymmetry\nby Julia Harz as part of CERN Theory Colloquia\n\n\nA
bstract\nWith neutrino oscillations pointing us towards massive neutrinos\
, they are a clear hint towards physics beyond the standard model. With a
bright and diverse landscape of current and future experiments\, novel app
roaches are being developed to probe the nature and interactions of neutri
nos. First\, I will talk about possible dim-5 interactions\, in particular
transition magnetic moments\, and will discuss the sensitivity of coheren
t elastic neutrino-nucleus scattering experiments to probe those. In this
context\, I will present a new smoking gun signature that can probe steril
e neutrinos in an unexplored parameter space and can be used to distinguis
h between a Dirac or Majorana nature. I will then continue with possible d
im-7 and dim-9 lepton-number violating interactions. I will discuss the in
teresting interplay between different observables such as meson decays\, n
eutrinoless double beta decay and LHC searches. Finally\, I will demonstra
te the far-reaching implications of such an observation for cosmology: the
potential to render standard thermal leptogenesis unviable.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Rattazzi
DTSTART:20211201T130000Z
DTEND:20211201T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/30
DESCRIPTION:Title: The quantum mechanics of a perfect fluid\nby Riccardo Rattazzi
as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Csaba Csaki
DTSTART:20211208T140000Z
DTEND:20211208T153000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/31
DESCRIPTION:Title: Magnetic scattering: pairwise little group and pairwise helicity\nby Csaba Csaki as part of CERN Theory Colloquia\n\n\nAbstract\nI discu
ss how to construct a Lorentz-invariant S-matrix for the scattering of ele
ctrically and magnetically charged particles. A key ingredient is a revisi
on of our fundamental understanding of multi-particle representations of t
he Poincaré group. Surprisingly\, the asymptotic states for electric-magn
etic scattering transform with an additional little group phase\, associat
ed with pairs of electrically and magnetically charged particles. I will d
iscuss the general construction of such states. The resulting "pairwise he
licity" is identified with the quantized "cross product" of charges e1 g2-
e2 g1 for every charge-monopole pair\, and represents the extra angular
momentum stored in the asymptotic electromagnetic field. We define a new k
ind ofpairwise spinor-helicity variable\, which serves as an additional bu
ilding block for electric-magnetic scattering amplitudes. We then construc
t the most general 3-point S-matrix elements\, as well as the full partial
wave decomposition for the 2 -> 2 fermion-monopole S-matrix. In particula
r\, we derive the famous helicity flip in the lowest partial wave as a sim
ple consequence of a generalized spin-helicity selection rule\, as well as
the full angular dependence for the higher partial waves. We will also di
scuss a possible direction for resolving Callan's ``semiton" problem: the
scattering amplitude of a positron on a GUT monopole which apparently does
not have an allowed final state. We will show that using entagled pairwis
e helicity spinors a simple possible s-wave final state does exist.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joao Penedones
DTSTART:20211215T130000Z
DTEND:20211215T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/32
DESCRIPTION:Title: Talk by Joao Penedones\nby Joao Penedones as part of CERN Theo
ry Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Patrick Huber
DTSTART:20220119T130000Z
DTEND:20220119T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/33
DESCRIPTION:Title: Fluxes and Interactions of Reactor Neutrinos\nby Patrick Huber
as part of CERN Theory Colloquia\n\n\nAbstract\nNeutrinos were discovered
using a nuclear reactor as a source and since then much of our knowledge
about neutrinos comes from experiments using reactors. I will briefly touc
h on the history of the use of reactors as neutrino source and motivate wh
y they still play an important role today and in the future. An overview o
f the physics of how neutrinos are generated in reactors and how we can co
mpute neutrino fluxes will follow. The developments of the past decade wil
l be reviewed in particular. 2021 may have seen the resolution of one majo
r riddle regarding the neutrino yield from uranium-235 and I will comment
on this. I also will present the current status of the sterile neutrino in
electron neutrino disappearance including recent gallium results. I will
conclude with an outlook towards the future both for our understanding of
the reactor neutrino flux and reactor neutrino measurements. I also will
be touching on coherent elastic neutrino nucleus scattering at reactors.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Simmons-Duffin
DTSTART:20220216T150000Z
DTEND:20220216T160000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/34
DESCRIPTION:Title: Carving out gravitational theory space\nby David Simmons-Duffi
n as part of CERN Theory Colloquia\n\n\nAbstract\nIt has long been expecte
d that UV consistency of quantum gravity places constraints on low energy
observables. I will discuss new techniques for deriving such constraints -
- techniques that arose through an interesting interplay between effective
field theory and the conformal bootstrap.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Van Raamsdonk
DTSTART:20220224T150000Z
DTEND:20220224T170000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/35
DESCRIPTION:Title: Cosmology from vacuum physics\nby Mark Van Raamsdonk as part o
f CERN Theory Colloquia\n\n\nAbstract\nWe discuss a holographic approach t
o describing cosmological physics. The cosmological spacetime is encoded i
n a special state of a four-dimensional quantum field theory that is not c
onventionally holographic. The state is produced via a Euclidean path inte
gral that includes a three-dimensional holographic theory at a boundary in
the Euclidean past. The same Euclidean path integral can be used to defin
e a dual static spacetime\, and the many of the observables in the cosmolo
gy are equivalent to vacuum observables in the static spacetime. This dual
ity has interesting consequences\, for example it gives a simple explanati
on for correlations between regions of the universe that apparently were n
ever in causal contact. The model gives an effective field theory whose fu
ndamental constant that is negative\, but generically will have a phase of
accelerated expansion via a rolling scalar.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mao Zeng
DTSTART:20220302T130000Z
DTEND:20220302T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/36
DESCRIPTION:Title: Multi-loop scattering amplitudes and gravitational binary dynamics
\nby Mao Zeng as part of CERN Theory Colloquia\n\n\nAbstract\nNext-gen
eration gravitational wave detectors require highly precise predictions fo
r the waveforms from inspiraling black holes and neutron stars. We present
advances in binary inspiral dynamics by taking classical limits of scatte
ring amplitudes in perturbative quantum gravity. The amplitudes are calcul
ated efficiently using modern methods for scattering amplitudes\, includin
g double copy and generalized unitarity\, and loop integration techniques
borrowed from collider physics. Classical physics can be extracted by seve
ral complementary approaches\, including effective field theory\, eikonal
exponentiation\, and observables in wavepacket scattering. For both conser
vative and dissipative dynamics of binary systems\, we obtain new terms in
the post-Minksowskian expansion beyond the best previous results from pur
ely classical methods.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Claude Duhr
DTSTART:20220309T130000Z
DTEND:20220309T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/37
DESCRIPTION:Title: The dawn of N3LO\nby Claude Duhr as part of CERN Theory Colloq
uia\n\n\nAbstract\nOver the last 5 years there was tremendous progress in
performing computations for hadron colliders at next-to-next-to-next-to-le
ading order (N3LO) in the strong coupling constant. In particular\, the co
mputation of fully-inclusive N3LO cross sections for color-singlet product
ion is by now well understood. These results can serve as a template to as
sess the impact and the importance of N3LO corrections. I will review the
state-of-the-art of these computations and what we have learned about hadr
on collider phenomenology at N3LO.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shu-Heng Shao
DTSTART:20220316T130000Z
DTEND:20220316T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/38
DESCRIPTION:Title: Generalized Global Symmetries\nby Shu-Heng Shao as part of CER
N Theory Colloquia\n\n\nAbstract\nSymmetry has proven to be of fundamental
importance for describing Nature. I will discuss recent developments in v
arious generalizations of global symmetries and their applications in quan
tum field theory\, condensed matter physics\, and quantum gravity. These
generalized global symmetries exist ubiquitously in familiar quantum syste
ms\, including the Ising model\, Maxwell theory\, lattice gauge theories\,
and Yang-Mills theories. They also feature in more novel topological phas
es of quantum matter such as fractons. These new symmetries can have gene
ralized anomalies\, which lead to nontrivial dynamical consequences on ren
ormalization group flows and analytic constraints on the phase diagram of
gauge theories. In the case of fractons and related exotic lattice models
in condensed matter theory\, the generalized global symmetry results in a
surprising UV/IR mixing.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clay Córdova
DTSTART:20220323T130000Z
DTEND:20220323T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/39
DESCRIPTION:Title: Secrets of the Renormalization Group\nby Clay Córdova as part
of CERN Theory Colloquia\n\n\nAbstract\nThe renormalization group is a co
re idea of theoretical physics and organizes phenomena by energy scale. F
amously\, this flow is coarse graining: as one goes to longer distances de
grees of freedom are lost. In spite of this monotonicity there are certai
n quantities\, intrinsically linked to general notions of symmetry and ano
malies\, that are constants of the renormalization group flow. I will rev
iew some of these ideas and briefly discuss several recent applications\,
including results about the behavior of Yang-Mills theory as a function of
the theta-angle.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Irene Valenzuela
DTSTART:20220406T120000Z
DTEND:20220406T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/40
DESCRIPTION:Title: The Quantum Gravity Imprint at Low Energies\nby Irene Valenzue
la as part of CERN Theory Colloquia\n\n\nAbstract\nConsistency with quantu
m gravity can impose non-trivial constraints at low energies\, even if the
Planck scale is at very high energy. The Swampland program aims to determ
ine the constraints that an effective field theory must satisfy to be cons
istent with a UV embedding in a quantum gravity theory. This has led to ne
w quantum gravity constraints\, motivated by black hole physics and string
theory\, that can be used as new guiding principles to construct beyond s
tandard models of Particle Physics and Cosmology. They might also provide
the missing piece to solve the long-standing naturalness issues observed i
n our universe. In this talk\, I will review the most important Swampland
conjectures and recent developments regarding their connections and phenom
enological implications.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alvaro De Rujula
DTSTART:20220413T120000Z
DTEND:20220413T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/41
DESCRIPTION:Title: The gravitational wave and short gamma-ray burst GW170817/SHB17081
7A\, not your everyday binary neutron star merger\nby Alvaro De Rujula
as part of CERN Theory Colloquia\n\n\nAbstract\nThe splendid data\, theor
y and analysis of the gravitational wave GW170817 --the neutron star merge
r that was also seen across the electromagnetic spectrum as SHB170817A*--
are well known to cosmologists and particle physicists. Some of them are p
erhaps less familiar with the SHB and with what the GW wave and the SHB im
ply for each other’s understanding. My intention is to attempt to fill t
his possible gap in their information.\n\n*) SHB stands for Short Hard (g
amma-ray) Burst\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Hindmarsh
DTSTART:20220420T120000Z
DTEND:20220420T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/42
DESCRIPTION:Title: Probing phase transitions in the early universe with gravitational
waves\nby Mark Hindmarsh as part of CERN Theory Colloquia\n\n\nAbstra
ct\nGravitational waves will be an important probe of physics beyond the S
tandard Model\, as they would be produced at possible first order phase tr
ansitions in the early universe. I will discuss the characteristic spectru
m of gravitational radiation from phase transitions\, how it is connected
to underlying physics\, and prospects for observing measuring thermodynami
c parameters at the future space-based gravitational wave detector LISA.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sebastian Mizera
DTSTART:20220427T120000Z
DTEND:20220427T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/43
DESCRIPTION:Title: What is the iε for the S-matrix?\nby Sebastian Mizera as part
of CERN Theory Colloquia\n\n\nAbstract\nCan the S-matrix be complexified
in a way consistent with causality? Since the 1960's\, the affirmative ans
wer to this question has been well-understood for 2→2 scattering of the
lightest particle in theories with a mass gap at low momentum transfer\, w
here the S-matrix is analytic everywhere except at normal-threshold branch
cuts. We ask whether an analogous picture extends to realistic theories\,
such as the Standard Model\, that include massless fields\, UV/IR diverge
nces\, and unstable particles. Especially in the presence of light states
running in the loops\, the traditional iε prescription for approaching ph
ysical regions might break down\, because causality requirements for the i
ndividual Feynman diagrams can be mutually incompatible. We demonstrate th
at such analyticity problems are not in contradiction with unitarity. Inst
ead\, they should be thought of as finite-width effects that disappear in
the idealized 2→2 scattering amplitudes with no unstable particles\, but
might persist at higher multiplicity. To fix these issues\, we propose an
iε-like prescription for deforming branch cuts in the space of Mandelsta
m invariants without modifying the analytic properties. This procedure res
ults in a complex strip around the real part of the kinematic space\, wher
e the S-matrix remains causal.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Enrico Pajer
DTSTART:20220504T120000Z
DTEND:20220504T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/44
DESCRIPTION:Title: A timeless history of time\nby Enrico Pajer as part of CERN Th
eory Colloquia\n\n\nAbstract\nCosmological observations give us the unique
opportunity to probe the fundamental laws of physics at very high energie
s as well as the perturbative regime of quantum gravity. Unfortunately\, d
ue to the creativity of theorists and the paucity of data about the primor
dial universe\, there are many models that are still compatible with all m
easurements\, featuring a wide variety of mechanisms\, symmetries\, and sp
ectra of particles. The reason can be traced back to the fact that we don'
t observe the time evolution during inflation\, but only its final outcome
.\nIn this talk\, I report on the recent progress in developing a new "boo
tstrap" approach to derive predictions from the very early universe that m
akes no reference to the un-observable time evolution. The bootstrap appro
ach builds directly upon the fundamental pillars of physics. In particular
\, I will present the recent breakthroughs in understanding the consequenc
e of unitarity for cosmological correlators to all orders in perturbation
theory\, as well as the footprint of (bulk) locality. These principles can
be used to derive many classical and new inflationary predictions associa
ted with primordial non-Gaussianity in a way that is both computationally
simpler and conceptually more transparent. Topics to be presented include
a reconstruction formula that relates de Sitter correlators to amplitudes
for massless particles\, cosmological partial-energy recursion relations a
nd a "timeless" differential representation of the perturbative wavefuncti
on. The approach makes no reference to de Sitter boosts\, which are broken
by a large amount in models that predict large non-Gaussianity. I will co
nclude with speculations on how these results give us a handle on non-pert
urbative effects in cosmology either from cosmological positivity bounds o
r from de Sitter holography.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lina Necib
DTSTART:20220511T120000Z
DTEND:20220511T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/45
DESCRIPTION:Title: Tracing Dark Matter with Stars around the Milky Way\nby Lina N
ecib as part of CERN Theory Colloquia\n\n\nAbstract\nIn this talk\, I expl
ore the impact of stellar kinematics on understanding the particle nature
of Dark Matter in four separate locations: the solar neighborhood\, the Ga
lactic center\, dwarf galaxies\, and streams. I first discuss the implicat
ions of the different stellar components on direct detection experiments.
I show how to use the velocity distribution of stars in the solar neighbor
hood to determine the empirical velocity distribution of Dark Matter\, cri
tical for direct detection. I then use an example of a Dark Matter candida
te annihilating to gamma rays in the Galactic Center to motivate the need
for accurate measurements of the Dark Matter density profile. Subsequently
\, I motivate the need for better understanding of the density profiles of
dwarf galaxies given their large implications on indirect detection\, by
analyzing mock data and reconstructing the inner slope of the Dark Matter
profile. Finally\, I close by arguing for the importance of streams in ide
ntifying the Dark Matter subhalo population\, and present a new stream fin
ding algorithm called Via Machinae based on unsupervised machine learning
techniques.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cora Dvorkin
DTSTART:20220518T120000Z
DTEND:20220518T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/46
DESCRIPTION:Title: Unlocking New Physics out of Astrophysical Data Sets\nby Cora
Dvorkin as part of CERN Theory Colloquia\n\n\nAbstract\nCosmological obser
vations and galaxy dynamics have shown us that 84% of all matter in the un
iverse is composed of dark matter\, which is not accounted for by the Stan
dard Model of particles. The nature and interactions of dark matter remain
one of the great puzzles of fundamental physics.\nThe wealth of knowledge
which is and will soon be available from astrophysical surveys will revea
l new information about our universe. I will discuss new ways to use curre
nt and upcoming data sets to improve our understanding of the particle con
tent of our universe both at large and small scales.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gudrun Hiller
DTSTART:20220525T120000Z
DTEND:20220525T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/47
DESCRIPTION:Title: The same\, yet not the same: how to crack a paradigm (Flavor anoma
lies: status and prospects)\nby Gudrun Hiller as part of CERN Theory C
olloquia\n\n\nAbstract\nThe behavior of matter is ruled by the standard mo
del of particle physics -- really? Old puzzles and new evidences from prec
ision measurements are lurking and pose challenges to standard theory. Dev
iations in processes as rare as one in a billion suggest that electrons an
d muons are more different than thought: they should behave the same accor
ding to the standard model\, yet\, recent data from the Large Hadron Colli
der in Geneva finds them to behave differently. If taken at face value\, t
his anomaly heralds a very loud breakdown of the standard model\, and req
uires out-of-the-box new physics.\nIntriguingly\, cracking this with lepto
quarks\, i.e.\, new particles which share features from quarks and leptons
alike\, also open doors into the notorious and longstanding flavor puzzle
. This talk reports on the rise of the anomalies in flavor physics\, rare
decays of beauty quarks and further cracks in the building.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mari Carmen Bañuls
DTSTART:20220601T120000Z
DTEND:20220601T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/48
DESCRIPTION:Title: Tensor Networks: entanglement and the simulation of quantum many-b
ody problems\nby Mari Carmen Bañuls as part of CERN Theory Colloquia\
n\n\nAbstract\nThe term Tensor Network States (TNS) designates a number of
ansatzes that can efficiently represent certain states of quantum many-bo
dy systems. In particular\, ground states and thermal equilibrium of local
Hamiltonians\, and\, to some extent\, real time evolution can be numerica
lly studied with TNS methods. Quantum information theory provides tools to
understand why they are good ansatzes for physically relevant states\, an
d some of the limitations connected to the simulation algorithms.\n \nOrig
inally introduced in the context of condensed matter physics\, these metho
ds have become a state-of-the-art technique for strongly correlated one-di
mensional systems. Their applicability extends nevertheless to other field
s. As an example\, in the last few years it has been shown that TNS are al
so suitable to study lattice gauge theories and other quantum field proble
ms. This talk gives an overview of the possibilities and limitations of th
ese methods\, and some of their recent applications to this kind of proble
ms.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soeren Schlichting
DTSTART:20220608T120000Z
DTEND:20220608T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/49
DESCRIPTION:Title: Thermalization of QCD plasmas\nby Soeren Schlichting as part o
f CERN Theory Colloquia\n\n\nAbstract\nOver the past decades experiments a
t the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider
(LHC) have discovered the formation of a de-confined Quark-Gluon Plasma (
QGP) \, and established a standard picture of the space-time evolution of
the QGP based on relativistic viscous hydrodynamics. While high-energy hea
vy-Ion collisions thus provide a unique laboratory to study QCD matter und
er extreme conditions\, it has proven challenging to understand how the fa
r-from equilibrium matter created in the collision turns into a nearly equ
ilibrated plasma of quarks and gluons. Starting with a brief introduction\
, I will highlight recent theoretical progress in understanding thermaliza
tion mechanisms in QCD plasmas and address the question how an almost equi
librated Quark-Gluon plasma is created during the early stages of high-ene
rgy collisions. I will also discuss how these studies provide new insights
into the range of applicability of dissipative fluid dynamics and how an
improved understanding of the out-of-equilibrium dynamics of the QGP enabl
es new connections between hot QCD and cold QCD research.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michelangelo Mangano
DTSTART:20220615T120000Z
DTEND:20220615T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/50
DESCRIPTION:Title: Why FCC?\nby Michelangelo Mangano as part of CERN Theory Collo
quia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Shifman
DTSTART:20220622T120000Z
DTEND:20220622T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/51
DESCRIPTION:Title: 50 Years of Supersymmetry\nby Michael Shifman as part of CERN
Theory Colloquia\n\n\nAbstract\nCERN was one of the birthplaces of four-di
mensional supersymmetry. 50 years elapsed after SUSY inception — a time
long enough for a comprehensive review of its impact on high energy physic
s\, quantum field theory\, mathematical physics and beyond. In this Colloq
uium I present a broad picture avoiding too technical aspects and emphasiz
ing the most important achievement and prospects for the future.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/51/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mikhail Solon
DTSTART:20220629T120000Z
DTEND:20220629T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/52
DESCRIPTION:Title: Quantum Field Theory Tools for Gravitational Wave Science\nby
Mikhail Solon as part of CERN Theory Colloquia\n\n\nAbstract\nFuture gravi
tational wave detectors will map out and characterize every binary merger
in the history of the universe. The possibilities for new and unexpected s
cientific discoveries from this wealth of data is staggering\, but hinges
crucially on complementary advances in our theoretical understanding of th
e nature of gravitational wave sources. However\, the path from Einstein
’s equation to precision binary dynamics is notoriously difficult\, and
conventional methods may not scale to the demands of future detectors. I w
ill describe our recent efforts in solving the relativistic two-body probl
em using tools from quantum field theory.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefan Antusch
DTSTART:20220706T120000Z
DTEND:20220706T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/53
DESCRIPTION:Title: Lepton Number Violation at Colliders via Heavy Neutrino-Antineutri
no Oscillations\nby Stefan Antusch as part of CERN Theory Colloquia\n\
nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Douglas Stanford
DTSTART:20220824T150000Z
DTEND:20220824T160000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/54
DESCRIPTION:Title: Wormhole effects in quantum black hole physics\nby Douglas Sta
nford as part of CERN Theory Colloquia\n\n\nAbstract\nA powerful idea in t
heoretical physics is the conjecture that (from a distance) black holes be
have like ordinary quantum systems. Thought of in this way\, black holes d
isplay many deep quantum phenomena in simple but often surprising ways. We
will discuss recent work (involving wormholes) that gives new examples of
this and also uncovers new puzzles.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Susanne Reffert
DTSTART:20220928T120000Z
DTEND:20220928T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/55
DESCRIPTION:Title: The large charge expansion\nby Susanne Reffert as part of CERN
Theory Colloquia\n\n\nAbstract\nOver the last few years\, it has become c
lear that working in sectors of large global charge leads to significant s
implifications when studying strongly coupled CFTs\, theories which are ot
herwise often inaccessible to analytic methods. It allows us in particular
to calculate the CFT data as an expansion in inverse powers of the large
charge. \nIn this talk\, I will introduce the large-charge expansion via t
he simple example of the O(2) model and will then generalize it to the O(N
) vector model which displays a richer structure due to its non-Abelian gl
obal symmetry group. Using large-N methods in conjunction with large charg
e gives us even more control over the dynamics and lets us study the syste
m away from the conformal point.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Harlow
DTSTART:20221005T120000Z
DTEND:20221005T130000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/56
DESCRIPTION:Title: The black hole interior from non-isometric codes and complexity\nby Daniel Harlow as part of CERN Theory Colloquia\n\n\nAbstract\nI'll g
ive an overview of recent work with Akers\, Engelhardt\, Penington\, and V
ardhan\, in which we propose a general framework for understanding the eme
rgence of the black hole interior and the resolution of the information pr
oblem. Many previous ideas\, such as null states\, non-linearity\, post-s
election\, the QES calculation of the Page curve\, and computational compl
exity\, arise naturally in this framework.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jasmine Therese Brewer
DTSTART:20221012T120000Z
DTEND:20221012T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/57
DESCRIPTION:Title: Jets as a probe of the quark-gluon plasma\nby Jasmine Therese
Brewer as part of CERN Theory Colloquia\n\n\nAbstract\nThe quark-gluon pla
sma produced in heavy-ion collisions provides unique access to many-body p
henomena in QCD. This high temperature phase of QCD matter can be studied
through its interactions with high-energy partons\, called jets\, that are
also produced in these collisions. We will discuss some of the modern adv
ances and challenges of studying the quark-gluon plasma using the phenomen
ology of the modification of the structure of jets. A promising avenue for
ward is to dig into the detailed structure of jets by studying them splitt
ing-by-splitting. I will discuss the unique phenomenology of one particula
r such splitting\, gluon splitting to charm quarks.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/57/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tim Cohen
DTSTART:20221019T120000Z
DTEND:20221019T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/58
DESCRIPTION:Title: Three Effective Field Theory Vignettes\nby Tim Cohen as part o
f CERN Theory Colloquia\n\n\nAbstract\nI will describe some recent work on
applying Effective Field Theory (EFT) methodology to three different phys
ically interesting systems. First I will explain the philosophy and gener
al methodology of EFT. I will then present three short vignettes. The fi
rst has to do with techniques for systematically computing the EFT paramet
ers from a given more fundamental description. The second will show how E
FT can be used to understand the behavior of quantum fields in an inflatio
nary background\, with applications to light scalar fields and the inflato
n itself. And in the third\, I will show how EFT ideas can be applied to
systematically improve a numerical technique for quantum field theory know
n as Hamiltonian truncation.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/58/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Liam McAllister
DTSTART:20221026T130000Z
DTEND:20221026T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/59
DESCRIPTION:Title: Small Cosmological Constants in String Theory\nby Liam McAllis
ter as part of CERN Theory Colloquia\n\n\nAbstract\nI will present a const
ruction of vacua of string theory in which the magnitude of the cosmologic
al constant is exponentially small. The vacua are supersymmetric AdS solu
tions in flux compactifications of type IIB string theory\, with all modul
i stabilized. The vacuum energy is small because we ensure the exact canc
ellation of all perturbative contributions\, through an explicit choice of
integer parameters determined by the topology and quantized fluxes. The
nonperturbative contributions that remain are exponential in these integer
s. Finding cosmological constants of small magnitude in this landscape is
exponentially easier than in Bousso-Polchinski landscapes\, but extending
our approach to positive cosmological constants in realistic universes is
a difficult open problem.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/59/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joseph Lykken
DTSTART:20221102T130000Z
DTEND:20221102T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/60
DESCRIPTION:Title: Prospects for experimental quantum gravity\nby Joseph Lykken a
s part of CERN Theory Colloquia\n\n\nAbstract\nUnderstanding quantum gravi
ty is one of the biggest intellectual challenges of modern science. String
theory and the related AdS/CFT correspondence provide a rigorous theoreti
cal laboratory to address some aspects of quantum gravity\, and a few semi
-classical quantum gravity effects\, notably the existence of Hawking radi
ation\, are well-established and understood. However we are strongly handi
capped by the inability to perform experiments that probe quantum gravity
effects directly. In recent years a series of results have established a p
romising pathway towards exhibiting and exploring genuine quantum gravity
effects in a laboratory setting. This pathway exploits what appears to be
a fundamental relationship between the connectedness of spacetime and quan
tum entanglement\, as well as the holographic duality between certain bulk
gravity phenomena and non-gravitational quantum systems. Both ideas are r
ealized in the phenomenon of traversable wormholes\, which have been shown
in the rigorous context of AdS/CFT to be a feature of semi-classical quan
tum gravity. Such wormholes are rendered traversable by a quantum effect i
nvolving a flux of negative energy\, similar to the quantum phenomenon tha
t enables Hawking radiation. Furthermore these wormholes have a holographi
c dual description as a new form of quantum teleportation\, which can be e
xplicitly realized in the dynamics of the SYK model with N interacting Maj
orana fermions. There is considerable evidence that N~100 should be good e
nough to exhibit the key properties of traversable wormholes in a laborato
ry setting\, e.g.\, by producing the dynamics on a quantum processor. I wi
ll describe how such experiments might be performed and what we could lear
n from them.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/60/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthew Schwartz
DTSTART:20221116T090000Z
DTEND:20221116T110000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/61
DESCRIPTION:Title: Machine Learning for Amplitudes\nby Matthew Schwartz as part o
f CERN Theory Colloquia\n\n\nAbstract\nMachine learning is playing an incr
easingly large role in much of science. In high energy physics it has alre
ady revolutionized many aspects of experimental and theoretical collider p
hysics. Collider physics is well suited to machine learning partly because
the problems are largely numerical. However\, much of high energy theory
is largely symbolic. Can machine learning help in these areas too? Inspire
d by the impressive success of large language models in recent years\, pro
gress on symbolic problems should be possible. In this talk I will review
some elements of symbolic learning\, including reinforcement learning and
transformer networks\, and discuss applications to the field of scattering
amplitudes. In particular\, I will discuss how the task of simplifying a
scattering amplitude to a simpler symbolic form.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/61/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonardo Senatore
DTSTART:20221123T130000Z
DTEND:20221123T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/62
DESCRIPTION:Title: The Effective Field Theory of Large-Scale Structure\nby Leonar
do Senatore as part of CERN Theory Colloquia\n\n\nAbstract\nThe Effective
Field Theory of Large-Scale Structure describes the long wavelength dynami
cs of the density perturbations in the universe. I will review the theory
and the application to data\, including some recent developments.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/62/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marc Kamionkowski
DTSTART:20221207T130000Z
DTEND:20221207T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/63
DESCRIPTION:Title: The cosmic optical background excess\, line-intensity mapping\
nby Marc Kamionkowski as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/63/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michele Maggiore
DTSTART:20221214T130000Z
DTEND:20221214T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/64
DESCRIPTION:Title: Fundamental physics and cosmology with the Einstein Telescope\
nby Michele Maggiore as part of CERN Theory Colloquia\n\n\nAbstract\nThe E
instein Telescope is a proposed third-generation gravitational wave detec
tor\, to be build in Europe in the next decade. Its sensitivity will allow
us to explore the depths on the Universe with gravitational waves. It is
expected to detect of order 10^5 binary black holes and binary neutron st
ars per year\, with binary black holes potentially detectable up to reds
hift z=O(100) and binary neutron stars up to z\\simeq 3. Many of these sig
nals will be reconstructed with remarkable accuracy\, up to cosmological d
istances. We will discuss the impact that these observations might have on
fundamental physics\, cosmology and astrophysics.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/64/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Martin Beneke
DTSTART:20230118T130000Z
DTEND:20230118T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/65
DESCRIPTION:Title: Nonperturbative and quantum effects in electroweak WIMP annihilati
on\nby Martin Beneke as part of CERN Theory Colloquia\n\n\nAbstract\nA
n electroweak WIMP with TeV mass is a minimal and viable dark-matter candi
date. Owing to the large dark-matter mass\, the relevant electroweak inter
actions exhibit many features more familiar from the strong interaction. P
redicting the dark-matter abundance and cosmic gamma-ray signal from dark-
matter annihilation reliably requires understanding the electroweak static
potential\, resonant behaviour and unitarity violation\, electroweak boun
d states\, electroweak jets and Sudakov resummation\, and possibly thermal
effects in the plasma. In this seminar I discuss the diverse physical and
field theoretical phenomena associated with TeV mass WIMPS approaching th
em with effective field theories and resummation methods familiar from QCD
.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/65/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nathaniel Craig
DTSTART:20230201T130000Z
DTEND:20230201T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/66
DESCRIPTION:Title: Predicting the Higgs Mass\nby Nathaniel Craig as part of CERN
Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/66/
END:VEVENT
BEGIN:VEVENT
SUMMARY:LANCE Dixon
DTSTART:20230208T130000Z
DTEND:20230208T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/67
DESCRIPTION:Title: The DNA of Particle Scattering\nby LANCE Dixon as part of CERN
Theory Colloquia\n\n\nAbstract\nScattering amplitudes are where quantum f
ield theory meets particle experiments\, especially at the LHC where the c
opious scattering of quarks and gluons in QCD produces Higgs bosons and ma
ny backgrounds to new physics searches. For decades\, it has been realize
d that the scattering of particles in gauge theories like QCD is far simpl
er than standard perturbative approaches would suggest. New approaches bas
ed on unitarity and bootstrapping have massively simplified many computati
ons previously done with Feynman diagrams. Still\, the final results are
often highly intricate\, multivariate mathematical functions\, which are d
ifficult to describe\, let alone compute. In many cases\, the functions h
ave a "genetic code" underlying them\, called the symbol\, which reveals t
heir structure. The symbol of such a function is a linear combination of w
ords\, sequences of letters analogous to sequences of DNA base pairs. Und
erstanding the alphabet\, and then reading the code\, exposes the physics
and mathematics underlying the scattering process. Remarkably\, the two s
cattering amplitudes known to the highest orders in perturbation theory (7
and 8 loops\, in planar N=4 super-Yang-Mills theory) are related to each
other by a mysterious antipodal duality\, which involves reading the code
backwards as well as forwards. This duality can now be embedded in a large
r\, but still mysterious\, "antipodal self-duality".\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/67/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sakura Schafer-Nameki
DTSTART:20230215T130000Z
DTEND:20230215T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/68
DESCRIPTION:Title: Non-Invertible Symmetries\nby Sakura Schafer-Nameki as part of
CERN Theory Colloquia\n\n\nAbstract\nSymmetries play a key role in almost
any context in theoretical physics. In the past year a new type of symmet
ry was uncovered\, so-called non-invertible symmetries. Unlike standard fa
re symmetries they do not obey group-multiplication\, but generally do not
have inverses. I will give examples of such symmetries and provide some a
pplications to QFTs in various dimensions.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/68/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joan Elias Miro
DTSTART:20230222T130000Z
DTEND:20230222T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/69
DESCRIPTION:Title: Bridging Positivity and S-matrix Bootstrap bounds\nby Joan Eli
as Miro as part of CERN Theory Colloquia\n\n\nAbstract\nIn this talk I wil
l show how to isolate Effective Field Theory scattering amplitudes in the
space of non-perturbative two-to-two amplitudes\, using the S-matrix Boots
trap. I will show that this construction leads to novel bounds on operator
s of dimension less than or equal to six\, and specupate about future apli
cations to the SM EFT.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/69/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giulia Zanderighi
DTSTART:20230301T130000Z
DTEND:20230301T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/70
DESCRIPTION:Title: Determination of the strong coupling using power corrections in th
e three-jet region\nby Giulia Zanderighi as part of CERN Theory Colloq
uia\n\n\nAbstract\nIn the determination of the strong coupling constant fr
om event shape variables in e+e- collisions\, there has been a long-standi
ng discrepancy between determinations that rely on analytic models for the
non-perturbative corrections\, and those that model hadronization correct
ions with Monte Carlo generators. Analytic approaches calculate non-pertur
bative corrections in the 2-jet region and apply them also to the 3-jet re
gion. We study the impact of the new calculation of non-perturbative corr
ections in the 3-jet region and address whether the these calculations li
ft the tension in the determination of alpha_s. Other findings and conside
rations will also be discussed.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/70/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jaroslav Trnka
DTSTART:20230308T130000Z
DTEND:20230308T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/71
DESCRIPTION:Title: Non-perturbative Amplituhedron Geometries\nby Jaroslav Trnka a
s part of CERN Theory Colloquia\n\n\nAbstract\nI will discuss some new dev
elopments in the context of the Amplituhedron construction for planar N=4
SYM scattering amplitudes. I will define a negative Amplituhedron geometry
which provides an all-loop order definition for a certain IR finite quant
ity\, related to the ratio of null polygonal Wilson loops. Then I will sho
w that the Amplituhedron picture suggests an interesting expansion of this
quantity in terms of "loops of loops"\, unrelated to the usual small coup
ling expansion. In the leading order\, I will provide an exact result to a
ll orders in the coupling\, and show the relation to the cusp anomalous di
mension. Finally\, I will discuss a certain interesting deformation of the
geometric construction\, and then conclude with future directions.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/71/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John Beacom
DTSTART:20230315T130000Z
DTEND:20230315T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/72
DESCRIPTION:Title: Frontiers in Neutrino Astronomy\nby John Beacom as part of CER
N Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/72/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gino Isidori
DTSTART:20230329T120000Z
DTEND:20230329T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/73
DESCRIPTION:Title: Decoding flavour hierarchies: an essential key to physics beyond t
he SM\nby Gino Isidori as part of CERN Theory Colloquia\n\n\nAbstract\
nFlavour physics represents one of the most fascinating puzzles of particl
e physics. I will discuss some recent developments in this field\, both fr
om a theoretical perspective and from a more phenomenological point of vie
w. I will focus in particular on the idea of flavour non-universal gauge i
nteractions\, as a way to address the origin of the observed flavour hiera
rchies while allowing a minimal destabilisation of the electroweak sector.
The implications of this class of models for both flavour physics experim
ents (analysing in particular the status of various recent anomalies) and
high-energy searches will also be discussed.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/73/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ruth Durrer Zimmermann
DTSTART:20230405T120000Z
DTEND:20230405T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/74
DESCRIPTION:Title: Testing General Relativity with cosmological large scale structure
observations\nby Ruth Durrer Zimmermann as part of CERN Theory Colloq
uia\n\n\nAbstract\nGeneral Relativity (GR) is immensely successful. With t
he late discovery of gravitational waves from black hole and neutron star
mergers\, it has passed all the tests with flying colors. But so far\, al
l observations have mainly tested the vacuum equations of GR. The most imp
ortant non-vacuum case\, cosmology\, is in agreement with GR only after th
e introduction of two otherwise unknown components\, 'Dark Matter' and 'Da
rk Energy' which amount to about 96% of the total energy budget of the pr
esent Universe. This led people in the field to question the validity of G
R for cosmology. Might it be that GR is flawed on large\, cosmological sca
les? Or in the presence of matter in general?\nBut how can we test Einstei
n's equation in the presence of matter? Can't we simply move any modificat
ion of the Einstein tensor to the right hand side and call it a 'dark matt
er/darkenergy' component?\nIn my talk I shall discuss possible ways (parti
ally) out of this dilemma. How to test both\, the left and the right hand
side of Einstein's equations with cosmological observations.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/74/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jose Ramon Espinosa Sedano
DTSTART:20230426T120000Z
DTEND:20230426T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/75
DESCRIPTION:Title: Applications of the Tunneling Potential Formalism\nby Jose Ram
on Espinosa Sedano as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/75/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paolo Gambino
DTSTART:20230510T120000Z
DTEND:20230510T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/76
DESCRIPTION:Title: The Vcb puzzle\nby Paolo Gambino as part of CERN Theory Colloq
uia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/76/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefan Floerchinger
DTSTART:20230517T120000Z
DTEND:20230517T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/77
DESCRIPTION:Title: Quantum field simulator for dynamics in curved spacetime\nby S
tefan Floerchinger as part of CERN Theory Colloquia\n\n\nAbstract\nQuantum
fields in curved spacetimes have many tantalizing theoretical properties\
, for example particles are being produced by the time-dependence of the g
eometry. I will describe how quantum fields in geometries with spacetime c
urvature and different cosmologies can be quantum-simulated with Bose-Eins
tein condensates in specifically designed trapping potentials and with tim
e-dependent interaction strengths. Analytical results for relativistic sca
lar fields in cosmologies with 2+1 spacetime dimensions will be compared w
ith recent experimental results obtained in Heidelberg laboratories.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/77/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elina Fuchs
DTSTART:20230524T120000Z
DTEND:20230524T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/78
DESCRIPTION:Title: Quantum sensing for New Physics and Gravitational Waves\nby El
ina Fuchs as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/78/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gregory Korchemsky
DTSTART:20230607T120000Z
DTEND:20230607T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/79
DESCRIPTION:Title: Integrability of high-energy QCD\nby Gregory Korchemsky as par
t of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/79/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elina Fuchs
DTSTART:20230614T120000Z
DTEND:20230614T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/80
DESCRIPTION:Title: Quantum sensing for New Physics and Gravitational Waves\nby El
ina Fuchs as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/80/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brian Fields
DTSTART:20230621T120000Z
DTEND:20230621T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/81
DESCRIPTION:Title: Big-Bang Nucleosynthesis: Beyond the Lithium Problem?\nby Bria
n Fields as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/81/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Massimiliano Grazzini
DTSTART:20230705T120000Z
DTEND:20230705T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/82
DESCRIPTION:Title: The Higgs boson and the top quark: precision theory for the LHC an
d beyond\nby Massimiliano Grazzini as part of CERN Theory Colloquia\n\
n\nAbstract\nThe Higgs boson and the top quark are the heaviest elementary
particles known to date. The study of their production and interaction is
crucial to improve our understanding of the Standard Model\, and can poss
ibly open a window on new physics. At the same time\, top quarks provide a
n ubiquitous background to Higgs studies and new-physics searches. We revi
ew recent theoretical progress in precision computations of top-quark prod
uction and related processes and present new results for ttH and ttW produ
ction at next-to-next-to-leading order in QCD.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/82/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Masanori Hanada
DTSTART:20230712T120000Z
DTEND:20230712T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/83
DESCRIPTION:Title: From matrix model to string theory and M-theory\nby Masanori H
anada as part of CERN Theory Colloquia\n\n\nAbstract\nRecent development o
f quantum technologies suggest an exciting new direction of the study of q
uantum gravity: We might be able to create black holes! More precisely\, w
e might be able to use quantum devices to simulate (seemingly) non-gravita
tional systems that are equivalent to quantum black holes via holography.
For such a purpose\, the D0-brane matrix model is probably the simplest ta
rget that has well-controlled limit that describes weakly-coupled gravity.
\n\nIn this talk\, we show the latest results of numerical simulations of
the D0-brane matrix model. The duality between the matrix model and type
IIA superstring theory is confirmed with a good precision\, including stri
ngy corrections. Furthermore\, we find a new low-energy phase (confined ph
ase) and suggest that this phase describes M-theory. We further argue that
the matrix model can describe the eleven-dimensional Schwarzschild black
hole. \n\nIf time permits\, we will provide a rough resource estimate for
quantum simulation.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/83/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Wald
DTSTART:20230717T120000Z
DTEND:20230717T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/84
DESCRIPTION:Title: Quantum Superpositions of Massive Bodies and Gravitationally Media
ted Entanglement\nby Robert Wald as part of CERN Theory Colloquia\n\n\
nAbstract\nWe analyze a gedanken experiment involving a quantum superposit
ion of a massive body and show that in order to avoid contradictions with
complementarity and causality\, it is necessary for there to be both quant
ized gravitational radiation and local vacuum fluctuations of the spacetim
e metric. We then improve upon this analysis by providing a precise and ri
gorous description of the entanglement and decoherence effects. As a by-pr
oduct of our analysis\, we show that under the protocols of the gedankenex
periment\, there is no clear distinction between entanglement mediated by
the Newtonian gravitational field of a body and entanglement mediated by o
n-shell gravitons emitted by the body. This suggests that Newtonian entang
lement implies the existence of graviton entanglement and supports the vie
w that the experimental discovery of Newtonian entanglement---as envisione
d in proposed experiments---provides evidence for the existence of the gra
viton.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/84/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Antoine Petiteau
DTSTART:20230719T120000Z
DTEND:20230719T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/85
DESCRIPTION:Title: Science prospects for LISA\nby Antoine Petiteau as part of CER
N Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/85/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surjeet Rajendran
DTSTART:20230726T120000Z
DTEND:20230726T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/86
DESCRIPTION:Title: A Causal Framework for Non-Linear Quantum Mechanics\nby Surjee
t Rajendran as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/86/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eiichiro Komatsu
DTSTART:20230913T120000Z
DTEND:20230913T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/87
DESCRIPTION:Title: Parity Violation in Cosmology\nby Eiichiro Komatsu as part of
CERN Theory Colloquia\n\n\nAbstract\nParity symmetry is known to be violat
ed in the weak interaction. Do the physical laws behind the unsolved probl
ems of modern cosmology - cosmic inflation\, dark matter\, and dark energy
- also violate parity symmetry? In this talk\, we will discuss theoretica
l and observational possibilities of parity violation in cosmology\, a top
ic that has received much attention in recent years.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/87/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthias Bartelmann
DTSTART:20230927T120000Z
DTEND:20230927T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/88
DESCRIPTION:Title: Kinetic field theory for cosmic structure formation\nby Matthi
as Bartelmann as part of CERN Theory Colloquia\n\n\nAbstract\nKinetic fiel
d theory is a new analytic approach to cosmic structure formation which av
oids some of the notorious problems in this field. I will briefly review t
he foundations of the theory and then highlight four recent results\, conc
erning the asymptotic behaviour of power spectra\, a mean-field approximat
ion to particle interactions\, perturbation theory\, and structure formati
on in modified gravity.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/88/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christophe Grojean
DTSTART:20231011T120000Z
DTEND:20231011T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/89
DESCRIPTION:Title: Higgs and Beyond the Standard Model: from LHC to future colliders<
/a>\nby Christophe Grojean as part of CERN Theory Colloquia\n\nAbstract: T
BA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/89/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Djuna Croon
DTSTART:20231018T120000Z
DTEND:20231018T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/90
DESCRIPTION:Title: Dark matter and celestial objects: new phenomenological opportunit
ies\nby Djuna Croon as part of CERN Theory Colloquia\n\n\nAbstract\nWe
have known since the 1970s that most matter in the Universe is dark. To u
ncover dark matter’s particle nature\, we must turn over every stone. In
this talk\, we will delve into the potential interactions between dark ma
tter and celestial objects such as stars\, planets\, and compact objects.
Such interactions can change their formation\, evolutionary trajectory\, a
nd final faith in an observable way. I will highlight various examples and
explore the resulting phenomenological opportunities in the coming decade
.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/90/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan Rojo
DTSTART:20231129T130000Z
DTEND:20231129T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/91
DESCRIPTION:Title: Physics with TeV Neutrinos from the LHC\nby Juan Rojo as part
of CERN Theory Colloquia\n\n\nAbstract\nProton-proton collisions at the LH
C produce an immense flux of high-energy (up to several TeV) neutrinos alo
ng the beam (forward) direction. The breakthrough observation of LHC neutr
inos by FASER and SND@LHC in March 2023 heralds a new era in particle phys
ics. In this talk I present the unprecedented reach of current (FASER\, SN
D@LHC) and future (FASER2\, AdvSND\, FLArE) forward LHC neutrino experimen
ts for studies of SM and BSM physics\, focusing on their impact for QCD an
d neutrino physics. I demonstrate that these experiments effectively exten
d the CERN infrastructure with an Neutrino-Ion Collider\, enabling novel o
pportunities to pin down hadronic structure\, opening a window to the gluo
n content of the proton in regions outside the coverage of any other expe
riment\, and providing the first laboratory-based validation of cross-sect
ions relevant for high-energy astroparticle studies.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/91/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fernando Quevedo
DTSTART:20240214T130000Z
DTEND:20240214T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/92
DESCRIPTION:Title: On Quantum Transitions and the String Landscape\nby Fernando Q
uevedo as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/92/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Antonin Portelli
DTSTART:20240221T130000Z
DTEND:20240221T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/93
DESCRIPTION:Title: Challenges in high-precision determinations of CKM matrix elements
using lattice QCD\nby Antonin Portelli as part of CERN Theory Colloqu
ia\n\n\nAbstract\nThe current precision on determining CKM matrix elements
is below a per cent in several cases\, and tensions between results are p
resent\, for example\, in the Vus/Vud plane. Investigating that problem is
essential for searching for new physics through weak decays. At this leve
l of precision\, a crucial ingredient is the determination of radiative co
rrections to pseudoscalar meson weak decays. Those have been computed main
ly through effective field theories\, which can have uncontrolled uncertai
nties. It is\, therefore\, important for lattice QCD+QED simulations to pr
ovide accurate predictions from first principles.\n\nIn this talk\, I will
present various results\, mainly from the UKQCD collaboration\, illustrat
ing several challenges faced when performing such calculations. The first
calculation at physical quark masses of radiative corrections to kaon and
pion was published in [1] after the pioneering work from [2]. A feature of
[1] is an uncomfortably sizeable systematic error due to theoretical unce
rtainties on higher-order finite-size corrections. I will present our resu
lt and detail this issue based on the formalism established in [3]. I will
conclude with future possible directions to address this problem.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/93/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Miguel Escudero Abenza
DTSTART:20240313T130000Z
DTEND:20240313T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/94
DESCRIPTION:Title: Modern Neutrino Cosmology\nby Miguel Escudero Abenza as part o
f CERN Theory Colloquia\n\n\nAbstract\nNeutrinos are ubiquitous in cosmolo
gy and they always represent a substantial fraction of the energy density
of the Universe. This makes cosmology a key arena to test the properties o
f the most elusive particles in the Standard Model. In this talk\, I will
begin by first reviewing the various ways in which neutrinos impact cosmol
ogical observables. I will discuss the origin of the cosmic neutrino backg
round\, and how neutrino physics can alter BBN and the CMB. I will then di
scuss three topics that I find timely in the context of precision cosmolog
y\, namely: 1) what is the value of Neff in the Standard Model and how do
we calculate it\, 2) what can cosmological observations tell us about BSM
neutrino interactions\, and 3) how robust are the very stringent cosmologi
cal neutrino mass bounds.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/94/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Peter Skands
DTSTART:20240320T130000Z
DTEND:20240320T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/95
DESCRIPTION:Title: Anatomy of LHC Collisions - And Future Challenges\nby Peter Sk
ands as part of CERN Theory Colloquia\n\n\nAbstract\nI will give an overvi
ew of our current picture of the physical mechanisms that are at play in L
HC collisions\, and review the current state of the art of detailed numeri
cal models of these processes. I will explain why I believe we are on the
cusp of at least two exciting revolutions\, and outline some of the main c
hallenges in realising them. I will include a few measurement highlights f
rom the Large Hadron Collider\, showcasing both successes and some (intere
sting) failures.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/95/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jean-Yves Ollitrault
DTSTART:20240424T120000Z
DTEND:20240424T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/96
DESCRIPTION:Title: QCD thermodynamics from LHC data\nby Jean-Yves Ollitrault as p
art of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/96/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gilad Perez
DTSTART:20240508T120000Z
DTEND:20240508T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/97
DESCRIPTION:Title: New era in dark matter searches the dawn of the (nuclear) clocks\nby Gilad Perez as part of CERN Theory Colloquia\n\n\nAbstract\nAfter a
brief introduction related to ultralight (pseudo) scalar dark matter\, we
are going to describe the current status of searches for ultralight dark
matter (UDM). We explain why modern clocks can be used to search for both
scalar and axion dark matter fields. We review existing and new types of w
ell-motivated models of UDM and argue that they all share one key ingredie
nt - their dominant coupling is to the QCD/nuclear sector\, which existing
clocks are less sensitive to (although there are a few ways to circumvent
this challenge). We then focus on nuclear clocks to show why they might i
mprove our sensitivity to DM searches by 8-10 orders of magnitude in the n
ear future\, and discuss some of the implications.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/97/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Krishna Rajagopal
DTSTART:20240612T120000Z
DTEND:20240612T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/98
DESCRIPTION:Title: Novel Probes of the Primordial Liquid\nby Krishna Rajagopal as
part of CERN Theory Colloquia\n\n\nAbstract\nHeavy ion collisions reprodu
ce droplets of the trillions-of-degrees-hot liquid that filled the microse
conds-old universe\, conventionally called quark-gluon plasma (QGP) but be
tter thought of as hot quark-gluon soup. Over the past couple of decades\,
data obtained via recreating this primordial fluid have shown that it is
the most liquid liquid in the universe\, making it the first complex matte
r to form as well as the source of all protons and neutrons. After a brief
look back at what we have learned about the formation and properties of t
his original liquid from heavy ion collisions\, I will focus on the road a
head\, in particular on new probes being developed to enable us to use dat
a from the LHC and RHIC to answer questions like: How does a strongly coup
led liquid emerge\, given that what you will see if you can probe QGP with
high resolution is weakly coupled quarks and gluons? How can we use jets
to see the inner workings of QGP and answer this question? And how does th
e droplet of QGP ripple after it has been probed by a passing jet?\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/98/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sophie Renner
DTSTART:20240619T120000Z
DTEND:20240619T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/99
DESCRIPTION:Title: New physics on the run from precision tests\nby Sophie Renner
as part of CERN Theory Colloquia\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/99/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benjamin Frederick Farr
DTSTART:20240710T120000Z
DTEND:20240710T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/100
DESCRIPTION:Title: Hearing the forest for the trees: understanding LIGO/Virgo's plur
ality of singularities\nby Benjamin Frederick Farr as part of CERN The
ory Colloquia\n\n\nAbstract\nBefore the start of their current and fourth
observing run (O4)\, the LIGO and Virgo detectors had already collected an
impressive census of compact binary mergers in the local universe. By the
end of O2 in August 2017 the LIGO Scientific Collaboration and Virgo Coll
aboration claimed a total of 10 binary black hole mergers and one binary n
eutron star merger. O3 spanned April 2019 through March 2020\, included ma
ny significant discoveries (e.g.\, neutron star-black hole binaries\, surp
risingly massive black holes)\, and culminated in the third catalog of com
pact binary mergers\, GWTC-3\, raising the total catalog of confidently de
tected binary mergers to 90. I will present some of what ground-based grav
itational wave astronomy has taught us about compact binaries over the las
t eight years\, and what may lie ahead.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/100/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laurent Lellouch
DTSTART:20241002T120000Z
DTEND:20241002T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/101
DESCRIPTION:Title: Probing the Standard Model to 0.37 ppm with the muon anomalous ma
gnetic moment\nby Laurent Lellouch as part of CERN Theory Colloquia\n\
n\nAbstract\nFor the past fifty years\, the Standard Model has been hugely
successful in describing subatomic phenomena. However\, recent measuremen
ts of the anomalous magnetic moment of the muon (a_mu) appear to challenge
that statement\, as they show a significant discrepancy with the referenc
e Standard Model prediction. After providing an overview of the current ex
perimental and theoretical landscape surrounding a_mu\, I will present a l
attice QCD calculation of the contribution that currently limits the preci
sion of the Standard Model's prediction for a_mu. When combined with the o
ther Standard Model contributions\, this calculation yields a prediction t
hat differs from the experimental measurement by only 0.9 standard deviati
ons\, with an overall precision of 0.37 ppm.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/101/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hofie Hannesdottir
DTSTART:20241009T120000Z
DTEND:20241009T140000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/102
DESCRIPTION:Title: Analytic properties of scattering amplitudes\nby Hofie Hannes
dottir as part of CERN Theory Colloquia\n\n\nAbstract\nIn this talk\, we w
ill explore intricate ways in which physical principles are encoded in sca
ttering amplitudes. In particular\, we will discuss the imprints of causal
ity and crossing symmetry on the analyticity properties of scattering ampl
itudes\, and show how different observables can be related to one another
via analytic continuations. We highlight how such physical insights can be
leveraged to simplify computations in perturbation theory\, and deepen ou
r understanding of collider observables.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/102/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matthew Lewandowski
DTSTART:20241030T130000Z
DTEND:20241030T150000Z
DTSTAMP:20260422T212754Z
UID:CERNTheoryColl/103
DESCRIPTION:Title: Physics of and from the large-scale structure of the Universe
\nby Matthew Lewandowski as part of CERN Theory Colloquia\n\n\nAbstract\nI
t is expected that measurements of the large-scale structure of the Univer
se will soon become our leading sources of fundamental cosmological inform
ation. In this talk\, I will review some of the major progress\, both theo
retical and data-oriented\, that we have made in understanding the physics
of galaxy clustering\, as well as what we might hope to learn about new p
hysics (including primordial non-Gaussianities) from these measurements. A
key milestone in this direction has been the advent and development of th
e Effective Field Theory of Large-Scale Structure (EFT of LSS)\, a theoret
ical framework that allows for a controlled and consistent perturbative ex
pansion (analogous to the QFT loop expansion) of cosmological observables
on large scales. After reviewing galaxy clustering surveys and the theoret
ical underpinnings of the EFT of LSS\, I will describe some recent results
. Overall\, we find that including higher-order predictions significantly
increases the amount of information that can be reliably extracted from ex
isting data sets. This points to even larger gains from future surveys suc
h as DESI\, Euclid\, and MegaMapper\, and opens the door to exploring exci
ting new physics with precision large-scale structure measurements.\n
LOCATION:https://researchseminars.org/talk/CERNTheoryColl/103/
END:VEVENT
END:VCALENDAR