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BEGIN:VEVENT
SUMMARY:Stefan Weinzierl (Mainz)
DTSTART:20200930T150000Z
DTEND:20200930T160000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/9
DESCRIPTION:Title: Feynman integrals associated to elliptic curves\nby Stefan Weinz
ierl (Mainz) as part of Dublin Theoretical Physics Colloquium\n\n\nAbstrac
t\nFeynman integrals are indispensable for precision calculations in quant
um field theory. But they are notoriously difficult to calculate. While we
do have methods to compute any one-loop Feynman integral analytically\, a
lready at two-loops there are Feynman integrals for which the known method
s fail. The first obstruction one encounters is related to elliptic curves
\, and for this reason the Feynman integrals not tractable by standard met
hods are known as ``elliptic’’ Feynman integrals. In this talk I will
review our current knowledge about Feynman integrals associated to ellipti
c curves.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edgar Shaghoulian (Cornell)
DTSTART:20201007T150000Z
DTEND:20201007T160000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/10
DESCRIPTION:Title: Looking for islands\nby Edgar Shaghoulian (Cornell) as part of
Dublin Theoretical Physics Colloquium\n\n\nAbstract\nI will review the rol
e of replica wormholes in deriving a unitary Page curve for Hawking radiat
ion and discuss extensions to flat spacetime and cosmology. I will also di
scuss general consistency conditions that guide the search for such nontri
vial saddles in the gravitational path integral.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marco Serone (SISSA)
DTSTART:20201014T150000Z
DTEND:20201014T160000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/11
DESCRIPTION:Title: Conformal windows and walking dynamics in four-dimensional gauge th
eories\nby Marco Serone (SISSA) as part of Dublin Theoretical Physics
Colloquium\n\n\nAbstract\nFour-dimensional gauge theories can flow in the
infrared to non-trivial conformal field theories. At large N the RG flow c
an be under perturbative control and in presence of scalar matter can admi
t more than one fixed point. We show a specific model of this kind where c
onformality can be lost due to the merging of two nearby fixed points that
move into the complex plane\, and gives rise to a walking dynamics. In th
e more interesting case of pure fermion matter\, such as QCD with an arbit
rary number $n_f$ of fundamental flavours\,\nonly one fixed point can be p
erturbatively under control and the extension of the conformal window is d
ebated. Using Borel resummation techniques we provide evidence that QCD wi
th $n_f=12$ is conformal and indications that the conformal window extends
to lower values of $n_f$.\nA possible walking regime can occur for $n_f<1
2$\, but in a regime where our methods break down.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Maloney (McGill)
DTSTART:20201021T150000Z
DTEND:20201021T160000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/12
DESCRIPTION:Title: Gravity from Averaging CFTs\nby Alex Maloney (McGill) as part o
f Dublin Theoretical Physics Colloquium\n\n\nAbstract\nI will explore the
idea that certain theories of gravity in Anti-de-Sitter space are dual to
an average over an ensemble of quantum theories\, rather than to a specifi
c quantum theory. I will describe an average over Narain’s family of tw
o-dimensional conformal field theories which describe free bosons on a tor
us\, and compute the partition function using the Siegel-Weil formula. Th
e result takes the form of a sum over geometries as one would expect in a
theory of gravity. But the gravitational theory looks more like a Chern-S
imons theory than like Einstein gravity.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Liam Fitzpatrick (Boston)
DTSTART:20201028T160000Z
DTEND:20201028T170000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/13
DESCRIPTION:by Liam Fitzpatrick (Boston) as part of Dublin Theoretical Phy
sics Colloquium\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paolo Di Vecchia (Nordita)
DTSTART:20201111T160000Z
DTEND:20201111T170000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/14
DESCRIPTION:Title: Universality of ultra-relativistic gravitational scattering\nby
Paolo Di Vecchia (Nordita) as part of Dublin Theoretical Physics Colloqui
um\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benjamin Basso (ENS)
DTSTART:20201202T160000Z
DTEND:20201202T170000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/15
DESCRIPTION:Title: Dressing up the pair of pants in planar N=4 SYM\nby Benjamin Ba
sso (ENS) as part of Dublin Theoretical Physics Colloquium\n\n\nAbstract\n
I will discuss the wrapping problem for structure constants of single-trac
e operators in planar N=4 SYM in the integrability-based hexagon formalism
. In this approach a three-point function represented as a pair of pants i
s cut into smaller pieces - the hexagons - which are then stitched back to
gether. The gluing procedure which is an important part of the program has
passed many tests but suffers from so-called wrapping divergences when ap
plied to short-length operators. In this talk I will explain how to fix th
is problem to leading order for a class of structure constants using an an
alogy with thermal correlation functions. Besides shedding light on the th
ermal-like structures dressing the hexagon formula\, the solution predicts
that new cubic structures must be added to the mix. The latter are specif
ic to the pair-of-pants geometry and help resolving a few tensions between
the hexagon predictions and known perturbative gauge / string theory resu
lts.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Smolkin (Jerusalem)
DTSTART:20201104T160000Z
DTEND:20201104T170000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/16
DESCRIPTION:by Michael Smolkin (Jerusalem) as part of Dublin Theoretical P
hysics Colloquium\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gregory Korchemsky (Saclay)
DTSTART:20201118T160000Z
DTEND:20201118T170000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/17
DESCRIPTION:Title: Solving AdS/CFT with strong Szego limit theorem\nby Gregory Kor
chemsky (Saclay) as part of Dublin Theoretical Physics Colloquium\n\n\nAbs
tract\nI will report on a recent progress in computing four-point correlat
ion functions of infinitely heavy half-BPS operators in planar N = 4 SYM.
Taking advantage of integrability of the theory\, these correlation functi
ons can be constructed in terms of fundamental building blocks - the octag
on form factors. We show that these functions can be expressed as Fredholm
determinants of the integrable Bessel operator and demonstrate that this
representation is very efficient in finding the dependence of the octagons
on the ’t Hooft coupling and two cross ratios. At weak coupling\, this
yields a known series representation of the octagon in terms of ladder int
egrals. At strong coupling\, we apply strong Szego limit theorem to develo
p a systematic expansion of the octagon in the inverse powers of the coupl
ing constant and calculate accompanying expansion coefficients analyticall
y.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shota Komatsu (CERN)
DTSTART:20201125T160000Z
DTEND:20201125T170000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/18
DESCRIPTION:Title: Wilson Loop and Matrix Product States in Maximally Supersymmetric Y
ang-Mills\nby Shota Komatsu (CERN) as part of Dublin Theoretical Physi
cs Colloquium\n\n\nAbstract\nOver the last fifteen years\, there have been
significant developments in computing correlation functions of local oper
ators in the maximally supersymmetric Yang-Mills theory in four dimensions
. What triggered this burst of activity was the finding by Minahan and Zar
embo that local operators in this theory can be mapped to states in an int
egrable spin chain. In this talk\, I will show that this correspondence ca
n be extended to Wilson loops in a rather nontrivial way: the Wilson loops
in this theory can be mapped to Matrix Product States in the same spin ch
ain system. I will explain this new relation and use it to compute the cor
relation function of the Wilson loop and a local operator.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kyle Parfrey (TCD)
DTSTART:20201209T160000Z
DTEND:20201209T170000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/19
DESCRIPTION:Title: A Tour of Computational Approaches in Relativistic Astrophysical Pl
asma Simulation\nby Kyle Parfrey (TCD) as part of Dublin Theoretical P
hysics Colloquium\n\n\nAbstract\nThe magnetised plasmas surrounding black
holes and neutron stars are responsible for a great variety of bizarre ast
ronomical phenomena\, from relativistic radio jets to giant gamma-ray flar
es. Understanding this behaviour via numerical simulation requires a range
of specialised methods\, dictated by the unusual physical conditions. I'l
l briefly introduce these two families of compact relativistic objects and
describe some ways in which recent computational research has both confir
med decades-old proposals and yielded a few surprises. I'll finish by desc
ribing ongoing work aiming to produce a simulation code that is useful for
both high-energy astrophysics and whole-device fusion-plasma modelling.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Puhm (Ecole Polytechnique\, CPHT)
DTSTART:20210407T150000Z
DTEND:20210407T160000Z
DTSTAMP:20260422T225823Z
UID:TCDcolloquium/20
DESCRIPTION:Title: Celestial Diamonds\nby Andrea Puhm (Ecole Polytechnique\, CPHT)
as part of Dublin Theoretical Physics Colloquium\n\n\nAbstract\nCelestial
holography asserts that the quantum gravity S-matrix in asymptotically fl
at space is dual to a codimension two conformal field theory living on the
celestial sphere. To understand the nature of the holographic map I will
focus on the celestial building blocks given by conformal primary wavefunc
tions which are boost rather than energy eigenstates and whose novel gener
alization captures ultra-boosted black holes\, shockwaves and other intere
sting bulk metrics. Examining the structure of global conformal multiplets
in 2D celestial CFT reveals the power of symmetry to organize socalled co
nformally soft behavior and ties together questions about the vacuum struc
ture of asymptotically flat spacetimes\, constraints on celestial amplitud
es\, and intrinsically 2D effective descriptions of celestial CFT. We refe
r to the nested structure of primary descendants as ‘celestial diamonds
’ and show that their corners are related to the factorization theorems
of celestial correlators\, soft charges for spontaneously broken asymptoti
c symmetries and conformal dressings for amplitudes.\n
LOCATION:https://researchseminars.org/talk/TCDcolloquium/20/
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