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BEGIN:VEVENT
SUMMARY:Luca Delacretaz (University of Chicago)
DTSTART;VALUE=DATE-TIME:20200430T150000Z
DTEND;VALUE=DATE-TIME:20200430T160000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/1
DESCRIPTION:Title: Hydrodynamic Fluctuations\nby Luca Delacretaz (University of Chicago)
as part of HoloTube: Applied holography webinars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/HoloTube/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eric Mefford (École Polytechnique Paris)
DTSTART;VALUE=DATE-TIME:20200505T150000Z
DTEND;VALUE=DATE-TIME:20200505T160000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/3
DESCRIPTION:Title: Transport in clean quantum critical superfluids\nby Eric Mefford (Éc
ole Polytechnique Paris) as part of HoloTube: Applied holography webinars\
n\n\nAbstract\nThe hydrodynamic regime of superfluids in systems like 4He
has been well understood since the seminal work of Landau and Tisza. A fun
damental assumption in much subsequent work is the low-temperature dominan
ce of the superfluid phonon which leads to universal behavior in transport
that is characterized by the phonon sound speed. I will discuss investiga
tions of the two-fluid model of superfluids near an underlying quantum cri
tical phase and establish criteria for the breakdown of this assumption wh
ich leads to novel transport behavior. A surprising result is the non-vani
shing of the charge density of the fluid’s normal component at zero temp
erature. I will illustrate these results with some holographic models.\n
LOCATION:https://researchseminars.org/talk/HoloTube/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chandan Setty (University of Florida)
DTSTART;VALUE=DATE-TIME:20200512T140000Z
DTEND;VALUE=DATE-TIME:20200512T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/4
DESCRIPTION:Title: Pairing instability on Luttinger Surfaces : SYK thermodynamics from a con
densed matter perspective\nby Chandan Setty (University of Florida) as
part of HoloTube: Applied holography webinars\n\n\nAbstract\nSuperconduct
ivity results from an instability of the Fermi surface — contour of pole
s of the single particle propagator — to an infinitesimally small attrac
tive inter-particle attraction. In this talk\, I will instead discuss the
analogous problem on a model Luttinger Surface — contour of zeros of the
Green function. Unlike a Fermi surface\, in the presence of an attracti
ve potential\, the model exhibits a quantum phase transition from a non-Fe
rmi liquid to a superconducting state. Crucially\, pair-fluctuations clos
e to the transition resemble well-studied models with gravity duals such a
s SYK. I will discuss implications of this result to microscopic models de
scribing Mott physics.\n
LOCATION:https://researchseminars.org/talk/HoloTube/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Richard Davison (Heriot-Watt University)
DTSTART;VALUE=DATE-TIME:20200519T140000Z
DTEND;VALUE=DATE-TIME:20200519T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/5
DESCRIPTION:Title: Relations between transport and chaos in holographic theories\nby Ric
hard Davison (Heriot-Watt University) as part of HoloTube: Applied hologra
phy webinars\n\n\nAbstract\nI will describe recent work illustrating gener
al relations between the transport properties and chaotic properties of qu
antum field theories with holographic duals. I will firstly show how a sim
ple analysis of near-horizon dynamics yields exact constraints on the spec
trum of collective excitations. I will then describe how this can be explo
ited to identify a universal feature in the spectrum\, and its implication
s for the collective transport properties of strongly interacting field th
eories with gravity duals.\n
LOCATION:https://researchseminars.org/talk/HoloTube/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rene Meyer (University of Wurzburg)
DTSTART;VALUE=DATE-TIME:20200602T140000Z
DTEND;VALUE=DATE-TIME:20200602T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/7
DESCRIPTION:Title: Strongly correlated Dirac materials\, electron hydrodynamics & AdS/CFT\nby Rene Meyer (University of Wurzburg) as part of HoloTube: Applied hol
ography webinars\n\n\nAbstract\nA current challenge in condensed matter ph
ysics is the realization of strongly correlated\, viscous electron fluids.
These fluids are not amenable to the perturbative methods of Fermi liquid
theory\, but can be described by holography\, that is\, by mapping them o
nto a weakly curved gravitational theory via gauge/gravity duality. The ca
nonical system considered for realizations has been graphene\, which posse
sses Dirac dispersions at low energies as well as significant Coulomb inte
ractions between the electrons. In this talk\, after introducing basic not
ions of hydrodynamics and holography\, I will discuss Kagome systems which
\, with electron fillings adjusted to the Dirac nodes of their band struct
ure\, provide a much more compelling platform for realizations of viscous
electron fluids\, including non-linear effects such as turbulence. In par
ticular\, in stoichiometric Scandium (Sc) Herbertsmithite\, the fine-struc
ture constant\, which measures the effective Coulomb interaction and hence
reflects the strength of the correlations\, is enhanced by a factor of ab
out 3.2 as compared to graphene. I will present a holographic model which
includes the leading finite coupling corrections and allows to estimate th
e ratio of shear viscosity over entropy density in Sc-Herbertsmithite\, an
d find it about three times smaller than in graphene. These findings put\,
for the first time\, the turbulent flow regime described by holography wi
thin the reach of experiments.\n
LOCATION:https://researchseminars.org/talk/HoloTube/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matteo Baggioli (host) (IFT Madrid)
DTSTART;VALUE=DATE-TIME:20200526T140000Z
DTEND;VALUE=DATE-TIME:20200526T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/8
DESCRIPTION:Title: Discussion about the applications of Holography\nby Matteo Baggioli (
host) (IFT Madrid) as part of HoloTube: Applied holography webinars\n\n\nA
bstract\nPanelists: Luca Delacretaz (Chicago)\, Blaise Gouteraux (Paris)\,
Saso Grozdanov (MIT & Ljubljana)\, Carlos Hoyos (Oviedo)\, Koenraad Schal
m (Leiden)\, Jan Zaanen (Leiden).\n\nAfter more than a Decade of effort in
to holography and its applications\, it is a perfect moment to put\noursel
ves on trial. What did we learn? What are we doing? And\, most importantly
\, what are we going to do next? With the help of the top experts in the c
ommunity\, we will try to address all of the above questions in an interac
tive panel discussion. As a moderator\, I will propose specific and concre
te questions about the last developments in the subject. All participants
are highly encouraged to bring\ntheir own questions and interact during th
e panel discussion.\n
LOCATION:https://researchseminars.org/talk/HoloTube/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ayan Mukhopadhyay (Indian Institute Of Technology Madras)
DTSTART;VALUE=DATE-TIME:20200609T140000Z
DTEND;VALUE=DATE-TIME:20200609T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/9
DESCRIPTION:Title: SL(2\,R) lattices and networks as information mirrors and decoders\nb
y Ayan Mukhopadhyay (Indian Institute Of Technology Madras) as part of Hol
oTube: Applied holography webinars\n\n\nAbstract\nQuantum black holes past
their Page times are unique objects in terms of how they process quantum
information. Thinking of such black holes as quantum circuits\, it has bee
n argued that while infalling information after Page time comes out quickl
y at the order of Hayden-Preskill time\, processing the information about
the black hole interior will require timescales that are much larger than
the evaporation time of the black hole in order to avoid information parad
oxes. Thus quantum black holes acts as information mirrors that reveals th
e bits that fell in just after Page time first and its own formation later
. Motivated by the fragmented horizon picture\, we construct a simple mode
l that can capture the essence of quantum black holes in terms of its info
rmation processing. Our model is a lattice of nearly two-dimensional anti-
de Sitter spaces interacting with mobile quantum hair carrying gravitation
al charges. We will show that this model can realize the Hayden-Preskill p
rotocol while not encountering information paradoxes due to inherent pseud
orandomness and scrambling. Furthermore\, we will discuss well motivated g
eneralizations of this model that are analogous to tensor networks. We wil
l argue these can provide computable “fragmented holographic” framewo
rks for general semi-local non-Fermi liquids and other strongly correlated
systems.\n
LOCATION:https://researchseminars.org/talk/HoloTube/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Umut Gürsoy (University of Utrecht)
DTSTART;VALUE=DATE-TIME:20200616T140000Z
DTEND;VALUE=DATE-TIME:20200616T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/10
DESCRIPTION:Title: Holography of the spin current\nby Umut Gürsoy (University of Utrec
ht) as part of HoloTube: Applied holography webinars\n\n\nAbstract\nRecent
developments both in high and low energy physics have increased the impor
tance of hydrodynamics of matter with correlated spin degrees of freedom.
In particular\, Takahashi et al managed to create stable spin currents in
liquid metals sourced by vorticity\, and the STAR collaboration at RHIC ob
served nontrivial polarization of hyperon particles in off-central heavy i
on collisions. Theoretical understanding of these findings requires adding
the spin current to (relativistic) hydrodynamics as a new degree of freed
om. In this talk — that will be based on arXiv:2004.05148 — I will de
scribe how this can be done by sourcing the spin current by torsion. I wil
l classify different types of torsion in 3+1 dimensions and develop the co
rresponding constitutive equations for the energy-momentum tensor and the
spin current. We will then analyze the problem in a toy holographic model
based on the 5D Lovelock-Chern-Simons theory. As a byproduct\, I will intr
oduce a number of previously unknown blackhole solutions to this theory a
nd map these solutions to hydrodynamics by the fluid-gravity correspondenc
e. The resulting energy-momentum and spin flow exhibits interesting featur
es including a dynamical version of the Barnett effect and indicate variou
s novel mechanisms through which spin currents may be generated in strongl
y correlated systems.\n
LOCATION:https://researchseminars.org/talk/HoloTube/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sera Cremonini (University of Lehigh)
DTSTART;VALUE=DATE-TIME:20200623T140000Z
DTEND;VALUE=DATE-TIME:20200623T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/11
DESCRIPTION:Title: Constraining Non-Relativistic RG Flows with Holography\nby Sera Crem
onini (University of Lehigh) as part of HoloTube: Applied holography webin
ars\n\n\nAbstract\nThe basic question of how to organize the degrees of fr
eedom of a quantum system as a function of energy scale has proven very di
fficult to address in a general context. The powerful c-theorems\, for exa
mple\, which provide a clear measure for the number of effective degrees o
f freedom through the existence of a monotonic c-function\, rely crucially
on Lorentz invariance. In this talk I will discuss attempts to identify p
otential generalizations of a c-function within the context of non-relativ
istic holographic RG flows. In particular\, I will examine Einstein-Maxwel
l-scalar theories that support geometries that are not Lorentz invariant a
t all energy scales\, and identify several quantities that behave monotoni
cally along RG flow. While some results are completely generic in Einstein
-Maxwell-scalar theories\, others will only hold in Einstein-scalar theori
es.\n
LOCATION:https://researchseminars.org/talk/HoloTube/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moshe Rozali (UBC Vancouver)
DTSTART;VALUE=DATE-TIME:20200630T140000Z
DTEND;VALUE=DATE-TIME:20200630T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/12
DESCRIPTION:Title: Effective Field Theory for Chaotic CFTs\nby Moshe Rozali (UBC Vancou
ver) as part of HoloTube: Applied holography webinars\n\n\nAbstract\nRelat
ions between chaos and hydrodynamics are one of the unique feature of holo
graphic CFTs. The early time Lyapunov regime can described by an effective
field theory of a single mode\, which for maximally chaotic systems is an
hydrodynamic mode. We describe that effective field theory for conformal
field theories\, both in two dimensions and in higher dimensions\, and sho
w how it captures maximal chaos and pole skipping. We discuss the relation
of the theory to other formulations of CFTs and show how it captures inte
resting objects such as conformal blocks and partial waves. We speculate o
n what is needed to extend the discussion to non maximal chaos.\n
LOCATION:https://researchseminars.org/talk/HoloTube/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rajeev Singh (Institute of Nuclear Physics Polish Academy of Scien
ces)
DTSTART;VALUE=DATE-TIME:20200707T140000Z
DTEND;VALUE=DATE-TIME:20200707T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/13
DESCRIPTION:Title: A new hydrodynamics with spin formalism for the description of polarizat
ion effect of Lambda hyperons\nby Rajeev Singh (Institute of Nuclear P
hysics Polish Academy of Sciences) as part of HoloTube: Applied holography
webinars\n\n\nAbstract\nMeasurements made recently by the STAR collaborat
ion show that the Lambda hyperons produced in relativistic heavy-ion colli
sions are subject to global spin polarization with respect to an axis coin
cident with the axis of rotation of the produced matter. Recently formulat
ed formalism of relativistic hydrodynamics with spin\, which is a generali
zation of the standard hydrodynamics\, is a natural tool for describing th
e evolution of such systems. This approach is based on the conservation la
ws and the form of the energy-momentum tensor and spin tensor postulated b
y de Groot\, van Leeuwen\, and van Weert (GLW). Using Bjorken symmetry we
show how this formalism may be used to determine observables describing th
e polarization of particles measured in the experiment.\n
LOCATION:https://researchseminars.org/talk/HoloTube/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Krikun (Nordita)
DTSTART;VALUE=DATE-TIME:20200714T140000Z
DTEND;VALUE=DATE-TIME:20200714T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/14
DESCRIPTION:Title: Coherent and incoherent transport in holographic models with spontaneous
ly broken translations\nby Alexander Krikun (Nordita) as part of HoloT
ube: Applied holography webinars\n\n\nAbstract\nIn holography it is relati
vely easy to construct the models which break translation symmetry either
explicitly\, or spontaneously\, or both. AC transport in these models has
a few interesting features\, which were in focus for the past few years\,
including the gapped “pseudo-Goldstone” mode\, the metal — Mott insu
lator transition\, the residual incoherent conductivity and the contributi
on of the gapped coherent peak in DC conductivity due to “phase relaxati
on”. It is particularly interesting to study these features in detail\,
since they might have a direct representation in the experimental data on
cuprates and doped Mott insulators. I will overview the subject and presen
t several recent observations in models with either helical or periodic ho
lographic lattices\, which shed some light on the physics behind these int
eresting features.\n
LOCATION:https://researchseminars.org/talk/HoloTube/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kévin Nguyen (Harvard University)
DTSTART;VALUE=DATE-TIME:20200721T140000Z
DTEND;VALUE=DATE-TIME:20200721T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/15
DESCRIPTION:Title: Superluminal chaos after a quantum quench\nby Kévin Nguyen (Harvard
University) as part of HoloTube: Applied holography webinars\n\n\nAbstrac
t\nI will present a formula to compute out-of-time-order correlators (OTOC
) in generic asymptotically AdS spacetimes\, based on the geodesic approxi
mation to bulk propagators and the exchange of gravitational shock waves.
In contrast to the standard method of Shenker and Stanford\, this formula
does not require to work in Fourier space and is therefore better suited w
hen considering time-dependent holographic states. Applying this new metho
d to the computation of OTOCs in quenched states dual to collapsing thin s
hells of matter (Vaidya spacetimes)\, we discover a transient superluminal
ity in the butterfly velocity characterizing information scrambling in the
system.\n
LOCATION:https://researchseminars.org/talk/HoloTube/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mario Flory (Jagiellonian University)
DTSTART;VALUE=DATE-TIME:20200728T140000Z
DTEND;VALUE=DATE-TIME:20200728T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/16
DESCRIPTION:Title: Complexity and Conformal Field Theory\nby Mario Flory (Jagiellonian
University) as part of HoloTube: Applied holography webinars\n\n\nAbstract
\nWe study circuit and state complexity in the universal setting of (1+1)-
dimensional conformal field theory and unitary transformations generat
ed by the stress-energy tensor. We provide a unified view of assigning
a cost to circuits based on the Fubini-Study metric\, iteratively solve th
e emerging integro-differential equation for sample optimal circuits an
d discuss the sectional curvature of the underlying geometry. We also disc
uss the relation of our work to Euler-Arnold type equations such as the Ko
rteweg-de Vries and Hunter-Saxton equations.\n
LOCATION:https://researchseminars.org/talk/HoloTube/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jelle Hartong (University of Edinburgh)
DTSTART;VALUE=DATE-TIME:20200901T140000Z
DTEND;VALUE=DATE-TIME:20200901T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/17
DESCRIPTION:Title: Dynamics of Fluids without Boost Symmetries\nby Jelle Hartong (Unive
rsity of Edinburgh) as part of HoloTube: Applied holography webinars\n\n\n
Abstract\nStandard textbook treatments of fluid dynamics assume the presen
ce of a boost symmetry. This is either a Galilean boost symmetry or a Lore
ntzian one and leads to the Navier-Stokes equations or their relativistic
counterpart. It is however not necessary to rely on a boost symmetry as on
e can treat velocity as the chemical potential associated with momentum co
nservation. In fact for fluids moving through a medium one expects boost s
ymmetries to be generically broken. This includes the case of scale invari
ant Lifshitz fluids. In this talk I will present the general treatment of
fluid dynamics without boost symmetries and I will show that there can be
10 dissipative and 6 non-dissipative transport coefficients (of which 2 ar
e hydrostatic and 4 are not) for uncharged non-boost invariant fluid dynam
ics. I will end with some comments regarding holographic realisations of n
on-boost invariant Lifshitz fluids.\n
LOCATION:https://researchseminars.org/talk/HoloTube/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Danny Brattan (University of Genova)
DTSTART;VALUE=DATE-TIME:20200908T140000Z
DTEND;VALUE=DATE-TIME:20200908T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/18
DESCRIPTION:Title: Diffusion in a magnetic field\nby Danny Brattan (University of Genov
a) as part of HoloTube: Applied holography webinars\n\n\nAbstract\nEven wi
th the simplifying assumption of non-dynamical (external) electromagnetic
fields\, magnetohydrodynamics is a technically subtle framework for unders
tanding the long wavelength and low frequency regime of interacting theori
es. One of these technicalities is that for many models of interdisciplina
ry relevance the magnetic field is a constant in equilibrium. Intuitively
however\, for momentum to be approximately conserved and enter the hydrody
namic description\, the magnetic field must vanish at leading order.\n\nIn
this talk I will review recent work that sheds light on some of the uniqu
e features of magnetohydrodynamics in (2+1)-dimensions\, with a particular
emphasis on diffusion. I will show that there is a qualitative and quanti
tative improvement in matching holographic and hydrodynamic correlators if
one correctly accounts for the magnetic field being non-zero in the backg
round. Consequently\, I will give conclusive evidence that there is a non-
zero incoherent Hall conductivity in the absence of parity violation that
was missed in previous approaches. Finally\, I will discuss some ways in w
hich this new approach can be applied to non-stringy systems.\n
LOCATION:https://researchseminars.org/talk/HoloTube/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paul Romatschke (University of Colorado Boulder)
DTSTART;VALUE=DATE-TIME:20200915T140000Z
DTEND;VALUE=DATE-TIME:20200915T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/19
DESCRIPTION:Title: Hydrodynamics Off Equilibrium\nby Paul Romatschke (University of Col
orado Boulder) as part of HoloTube: Applied holography webinars\n\n\nAbstr
act\nHaving a thermalized system is the textbook requirement for the appli
cability of hydrodynamics. However\, there is mounting evidence that hydro
dynamics offers a good quantitative description even in off-equilibrium si
tuations. Recent applications of resurgence to relativistic fluid dynamics
in the context of conformal systems is able to put the new\, generalized
theory of off-equilibrium fluid dynamics on solid theoretical footing\, wi
thout requiring near local equilibrium or even isotropy. This offers a tem
pting explanation for\nthe ‘unreasonable success’ of hydrodynamics in
describing experimental data for p+p and p+A collisions.\n
LOCATION:https://researchseminars.org/talk/HoloTube/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aldo Cotrone (University of Firenze)
DTSTART;VALUE=DATE-TIME:20200922T140000Z
DTEND;VALUE=DATE-TIME:20200922T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/20
DESCRIPTION:Title: Holographic QCD and Gravitational Waves\nby Aldo Cotrone (University
of Firenze) as part of HoloTube: Applied holography webinars\n\n\nAbstrac
t\nI will first review basic properties of the Sakai-Sugimoto model\, the
top-down holographic theory closest to QCD. Then\, in this model I will de
scribe the process of nucleation of bubbles of true vacua in the case of t
wo first-order transitions: the confinement/deconfinement and chiral symme
try breaking/restoration ones. Finally\, using these information\, I will
present the calculation of the gravitational wave spectra generated in the
se transitions\, when the Sakai-Sugimoto model is employed as a dark secto
r. Prospects of detection will be discussed.\n
LOCATION:https://researchseminars.org/talk/HoloTube/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John McGreevy (University of California at San Diego)
DTSTART;VALUE=DATE-TIME:20200929T160000Z
DTEND;VALUE=DATE-TIME:20200929T170000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/21
DESCRIPTION:Title: How right was Landau?\nby John McGreevy (University of California at
San Diego) as part of HoloTube: Applied holography webinars\n\n\nAbstract
\nThe Landau paradigm for phases of matter and transitions between them ha
s been very successful. It is even more successful if we extend it to inc
lude higher-form symmetries. I will discuss some applications of this way
of thinking about the world. This includes revisiting the idea that the 3d
Ising model is a string theory.\n(Based on work with Nabil Iqbal.)\n
LOCATION:https://researchseminars.org/talk/HoloTube/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrei Starinets (University of Oxford)
DTSTART;VALUE=DATE-TIME:20201006T140000Z
DTEND;VALUE=DATE-TIME:20201006T150000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/22
DESCRIPTION:by Andrei Starinets (University of Oxford) as part of HoloTube
: Applied holography webinars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/HoloTube/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrea Amoretti (University of Genoa)
DTSTART;VALUE=DATE-TIME:20201103T150000Z
DTEND;VALUE=DATE-TIME:20201103T160000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/23
DESCRIPTION:Title: Holography\, hydrodynamics and condensed matter experiments: a critical
overview\nby Andrea Amoretti (University of Genoa) as part of HoloTube
: Applied holography webinars\n\n\nAbstract\nIn this talk I will review th
e progress that has been done in the last year in the description of stron
gly coupled condensed matter electron systems by means of hydrodynamic and
holographic effective field theories\, focusing particularly on the exper
imental results. Particular attention will be put on recent results on hig
h temperature superconductors. In the final part of the talk I will try to
emphasize open questions and possible future directions.\n
LOCATION:https://researchseminars.org/talk/HoloTube/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cindy Keeler (Arizona State University)
DTSTART;VALUE=DATE-TIME:20201110T170000Z
DTEND;VALUE=DATE-TIME:20201110T180000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/24
DESCRIPTION:Title: Towards a general map from Navier-Stokes to Maxwell via Einstein\nby
Cindy Keeler (Arizona State University) as part of HoloTube: Applied holo
graphy webinars\n\n\nAbstract\nAfter a brief review of the cutoff-surface
formulation of fluid-gravity duality\, we explore the “square root” of
the fluid-dual metrics via the classical-double copy\, highlighting the c
onstant vorticity flows and potential flows which have algebraically speci
al Weyl double copy fields. We then present progress towards building the
same map\, from fluid solutions to gravitational solutions to Maxwell solu
tions\, for generic fluids in 2+1 dimensions. This talk is based on JHEP 0
8 (2020) 147 published with ASU students Nikhil Monga and Tucker Manton\,
and forthcoming work\n
LOCATION:https://researchseminars.org/talk/HoloTube/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ben Withers (University of Southampton)
DTSTART;VALUE=DATE-TIME:20201117T150000Z
DTEND;VALUE=DATE-TIME:20201117T160000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/25
DESCRIPTION:Title: Does the hydrodynamic expansion converge?\nby Ben Withers (Universit
y of Southampton) as part of HoloTube: Applied holography webinars\n\n\nAb
stract\nThis is one of the foundational questions in relativistic fluid me
chanics\, and concerns the properties of a gradient expansion at large ord
ers. Holographic theories provide the ideal testing ground for this questi
on\, since hundreds of orders in the expansion can be obtained with relati
ve ease. Famously\, the answer was found to be “No” for the Bjorken fl
ow\, an expanding plasma considered in position space. In this talk I will
begin by reviewing earlier work\, in which I show that the answer is inst
ead “Yes” for QNM dispersion relations in momentum space\, with a radi
us of convergence set by mode collisions in the complex momentum plane. I
will then present recent work showing that these hitherto disjoint avenues
of research are naturally unified\, and share a common underlying mechani
sm governing convergence.\n
LOCATION:https://researchseminars.org/talk/HoloTube/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ya-Wen Sun (UCAS Beijing)
DTSTART;VALUE=DATE-TIME:20201124T150000Z
DTEND;VALUE=DATE-TIME:20201124T160000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/26
DESCRIPTION:Title: Topological modes in hydrodynamics and holography\nby Ya-Wen Sun (UC
AS Beijing) as part of HoloTube: Applied holography webinars\n\n\nAbstract
\nIn this talk I will show that gapless modes in relativistic hydrodynamic
s could become topologically nontrivial by weakly breaking the conservatio
n of energy momentum tensor in a specific way. This system has topological
semimetal-like crossing nodes in the spectrum of hydrodynamic modes that
require the protection of a special combination of translational and boost
symmetries in two spatial directions. One possible origin for the non-con
servation terms of the energy momentum tensor is an external gravitational
field which could be generated by a specific coordinate transformation fr
om the flat spacetime. This suggests that topologically trivial modes coul
d become topologically nontrivial by being observed in a special non-inert
ial reference frame. Finally a holographic realization of this system will
be introduced.\n
LOCATION:https://researchseminars.org/talk/HoloTube/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glorioso\, Heller\, Kovtun\, Withers
DTSTART;VALUE=DATE-TIME:20201201T160000Z
DTEND;VALUE=DATE-TIME:20201201T170000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/27
DESCRIPTION:Title: Panel on "Hydrodynamics\, out-of-equilibrium physics and holography"
\nby Glorioso\, Heller\, Kovtun\, Withers as part of HoloTube: Applied hol
ography webinars\n\n\nAbstract\nHosts: Navid Abbasi and Matthias Kaminski
(HoloTube Team)\n\nPanelists: Pavel Kovtun (University of Victoria)\, Mich
al Heller (Max Planck Institute for Gravitational Physics\, Postdam)\, Pao
lo Glorioso (Stanford)\, Ben Withers (Southampton University)\n\nTitle: Di
scussion about Hydrodynamics\, Out-of-Equilibrium Physics and Holography\n
\nAbstract: In the recent two decades\, hydrodynamics has been systematica
lly studied as a low energy effective field theory (EFT)\, which is an exp
ansion into operators and their derivatives. This EFT has been extended in
many directions by: including the effect of interactions\, examining the
convergence of its dispersion relations\, re-summing the derivative expans
ion\, connecting it to gravity\, pushing it forward to far from equilibriu
m situations\, establishing its causality and stability conditions\, and d
eriving it from a generating functional. In this panel discussion\, with f
our experts we assess the status and prospects of this field.\n
LOCATION:https://researchseminars.org/talk/HoloTube/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorge Noronha (University of Illinois)
DTSTART;VALUE=DATE-TIME:20201215T150000Z
DTEND;VALUE=DATE-TIME:20201215T160000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/28
DESCRIPTION:Title: Holography and the Quark-Gluon Plasma: The Next Decade\nby Jorge Nor
onha (University of Illinois) as part of HoloTube: Applied holography webi
nars\n\n\nAbstract\nIn this talk I will critically review the role played
by holography in our current understanding of the quark-gluon plasma (QGP)
formed in heavy-ion collisions. Outstanding challenges regarding the hydr
odynamic behavior of the QGP will be presented\, considering the dynamical
inclusion of critical phenomena and\, especially\, concerning the modelin
g of the collective behavior displayed by small collision systems such as
proton-nucleus and proton-proton collisions. New opportunities to improve
the holographic modeling of the QGP\, in and out-of-equilibrium\, will be
discussed.\n
LOCATION:https://researchseminars.org/talk/HoloTube/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sayantani Bhattacharyya (NISER\, India)
DTSTART;VALUE=DATE-TIME:20201208T150000Z
DTEND;VALUE=DATE-TIME:20201208T160000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/29
DESCRIPTION:Title: Entropy current for higher derivative theories of gravity\nby Sayant
ani Bhattacharyya (NISER\, India) as part of HoloTube: Applied holography
webinars\n\n\nAbstract\nWe know that black holes could be viewed as thermo
dynamic ensemble of large number of microstates and therefore we could ass
ociate some entropy with these objects. For Einstein gravity\, the local a
rea element around any point of the black hole horizon plays the role of e
ntropy density\, that satisfies the second law of thermodynamics locally a
t every point on the horizon. However\, any UV complete theory of gravity\
, in its low energy limit\, will typically have higher derivative correcti
ons to Einstein gravity. Black holes continue to exist for such higher der
ivative theories. In this talk\, we shall show that for such theories we c
ould still satisfy the second law locally on every point of the horizon\,
at least when the dynamics of the black hole is of small amplitude. To see
this\, we need to add a spatial entropy current to the equilibrium constr
uction of Wald entropy density. This method also fixes some of the ambigui
ties that arise in Wald’s construction\, for the entropy of a dynamical
black hole in higher derivative theories.\n
LOCATION:https://researchseminars.org/talk/HoloTube/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glorioso\, Heller\, Kovtun\, Withers
DTSTART;VALUE=DATE-TIME:20201210T160000Z
DTEND;VALUE=DATE-TIME:20201210T180000Z
DTSTAMP;VALUE=DATE-TIME:20240329T061809Z
UID:HoloTube/30
DESCRIPTION:Title: Panel on "Hydrodynamics\, out-of-equilibrium physics and holography". Pa
rt II\nby Glorioso\, Heller\, Kovtun\, Withers as part of HoloTube: Ap
plied holography webinars\n\n\nAbstract\nHosts: Navid Abbasi and Matthias
Kaminski (HoloTube Team)\n\nPanelists: Pavel Kovtun (University of Victori
a)\, Michal Heller (Max Planck Institute for Gravitational Physics\, Postd
am)\, Paolo Glorioso (Stanford)\, Ben Withers (Southampton University)\n\n
Title: Discussion about Hydrodynamics\, Out-of-Equilibrium Physics and Hol
ography\n\nAbstract: In the recent two decades\, hydrodynamics has been sy
stematically studied as a low energy effective field theory (EFT)\, which
is an expansion into operators and their derivatives. This EFT has been ex
tended in many directions by: including the effect of interactions\, exami
ning the convergence of its dispersion relations\, re-summing the derivati
ve expansion\, connecting it to gravity\, pushing it forward to far from e
quilibrium situations\, establishing its causality and stability condition
s\, and deriving it from a generating functional. In this panel discussion
\, with four experts we assess the status and prospects of this field.\n
LOCATION:https://researchseminars.org/talk/HoloTube/30/
END:VEVENT
END:VCALENDAR