BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Free discussion
DTSTART;VALUE=DATE-TIME:20210317T173000Z
DTEND;VALUE=DATE-TIME:20210317T180000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25788@indico.mpp.mpg.de
DESCRIPTION:https://indico.mpp.mpg.de/event/7856/contributions/25788/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25788/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Wheeler DeWitt approach for Liouville quantum gravity
DTSTART;VALUE=DATE-TIME:20210318T133000Z
DTEND;VALUE=DATE-TIME:20210318T143000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25796@indico.mpp.mpg.de
DESCRIPTION:Speakers: Olga Papdoulaki ()\nI will present the connection be
tween the Wheeler-DeWitt approach for two-dimensional quantum gravity and
holography\, focusing in the case of Liouville theory coupled to c = 1 mat
ter. The analysis is in a spirit similar to the recent studies of Jackiw-T
eitelboim gravity. Matrix quantum mechanics and the associated double scal
ed fermionic field theory\, are providing the complete dynamics of such tw
o-dimensional universes with c=1 matter\, including the effects of topolog
y change.\n\n45' talk + 15' discussion\n\nhttps://indico.mpp.mpg.de/event/
7856/contributions/25796/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25796/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion session
DTSTART;VALUE=DATE-TIME:20210317T143000Z
DTEND;VALUE=DATE-TIME:20210317T151500Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25785@indico.mpp.mpg.de
DESCRIPTION:Speakers: Elias Kiritsis ()\nhttps://indico.mpp.mpg.de/event/7
856/contributions/25785/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25785/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Free discussion
DTSTART;VALUE=DATE-TIME:20210318T173000Z
DTEND;VALUE=DATE-TIME:20210318T180000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25801@indico.mpp.mpg.de
DESCRIPTION:https://indico.mpp.mpg.de/event/7856/contributions/25801/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25801/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Saturons
DTSTART;VALUE=DATE-TIME:20210319T150000Z
DTEND;VALUE=DATE-TIME:20210319T160000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25806@indico.mpp.mpg.de
DESCRIPTION:Speakers: Gia Dvali ()\nWe introduce the concept of saturons\,
systems that saturate a certain bound on entropy\, which is imposed \nby
S-matrix and unitarity. Such objects share certain niversal properties (
e.g.\, the area-law of entropy\, near-thermal emission\, inner entanglemen
t\, ...) that goes well beyond gravity. We give an example from QCD. We s
how that black holes and de Sitter are saturons and this determines their
physical properties such as their entanglement curves. Both exhibit anoma
lous quantum break-time which for de Sitter is deadly. Through this mechan
ism\, the S-matrix formulation\nof quantum gravity/string theory excludes
de Sitter vacua. \n\n45' talk + 15' discussion\n\nhttps://indico.mpp.mpg.
de/event/7856/contributions/25806/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25806/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion session
DTSTART;VALUE=DATE-TIME:20210318T143000Z
DTEND;VALUE=DATE-TIME:20210318T151500Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25797@indico.mpp.mpg.de
DESCRIPTION:Speakers: Jan de Boer ()\nhttps://indico.mpp.mpg.de/event/7856
/contributions/25797/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25797/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Outlook and discussion
DTSTART;VALUE=DATE-TIME:20210319T170000Z
DTEND;VALUE=DATE-TIME:20210319T173000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25808@indico.mpp.mpg.de
DESCRIPTION:Speakers: Roberto Emparan ()\nhttps://indico.mpp.mpg.de/event/
7856/contributions/25808/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25808/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a microscopic model of AdS fragmentation
DTSTART;VALUE=DATE-TIME:20210318T103000Z
DTEND;VALUE=DATE-TIME:20210318T113000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25794@indico.mpp.mpg.de
DESCRIPTION:Speakers: Tarek Anous ()\nA salient feature of black holes nea
r extremality is the appearance of an AdS$_2$ throat in their near-horizon
geometry. Depending on the underlying theory\, these AdS$_2$ throats may
be unstable to fragmentation\, wherein a single throat is instead replace
d by a tree-like structure of branched AdS$_2$ throats. For Einstein-Maxwe
ll theory\, the underlying reason behind this instability is the existence
of multi-centered configuration in the moduli space of black hole solutio
ns at fixed total charge. Given the success of the Schwarzian/SYK paradigm
for understanding a single AdS$_2$ it is time to revisit the fragmentatio
n story. To build up intuition\, I will present a model\, studied in the s
tatistical mechanics literature\, that shares many features with SYK\, inc
luding exact solvability at large-N and an emergent conformal symmetry tha
t gets weakly broken in the UV. The novel feature of this model is the app
earance of a spin glass phase at O(1) temperatures\, which I will try to r
elate to the fragmentation story.\n\n45' talk + 15' discussion\n\nhttps://
indico.mpp.mpg.de/event/7856/contributions/25794/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25794/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a Swampland Global Symmetry Conjecture
DTSTART;VALUE=DATE-TIME:20210317T093000Z
DTEND;VALUE=DATE-TIME:20210317T103000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25781@indico.mpp.mpg.de
DESCRIPTION:Speakers: Arthur Hebecker ()\nGiven that exact global symmetri
es are forbidden by quantum gravity\, it is natural to expect that bounds
on the quality of approximate global symmetries exist. So far\, holographi
c arguments have only been provided for the former claim. I will discuss a
classification of approximate global symmetries and describe a simple arg
ument\, based the Weak Gravity Conjecture\, for a quantitative bound on th
e sub-class of "gauge-derived" global symmetries. This has intriguing rela
tions to wormhole-based arguments\, which I will also present. I will end
with a brief discussion of the fundamental problems associated with euclid
ean wormholes and of some recent developments in this context.\n\n45' talk
+ 15' discussion\n\nhttps://indico.mpp.mpg.de/event/7856/contributions/25
781/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25781/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Unreasonable Effectiveness of Higher-Derivative Supergravity i
n AdS_4 Holography
DTSTART;VALUE=DATE-TIME:20210319T133000Z
DTEND;VALUE=DATE-TIME:20210319T143000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25804@indico.mpp.mpg.de
DESCRIPTION:Speakers: Nikolay Bobev ()\nI will describe the four-derivativ
e corrections to four-dimensional N=2 minimal gauged supergravity and show
that they are controlled by two constants. Interestingly\, the solutions
of the equations of motion in the two-derivative theory are not modified b
y the higher-derivative corrections. I will use this to arrive at a genera
l formula for the regularized on-shell action for any asymptotically local
ly AdS_4 solution of the theory and show how the higher-derivative correct
ions affect black hole thermodynamic quantities in a universal way. I will
employ these results in the context of holography to derive new explicit
results for the subleading corrections in the large N expansion of supersy
mmetric partition functions on various compact manifolds for a large class
of three-dimensional SCFTs arising from M2- and M5-branes. I will also br
iefly discuss possible extensions and generalizations of these results.\n\
n45' talk + 15' discussion\n\nhttps://indico.mpp.mpg.de/event/7856/contrib
utions/25804/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25804/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simple Euclidean wormholes might not contribute in the path integr
al
DTSTART;VALUE=DATE-TIME:20210317T103000Z
DTEND;VALUE=DATE-TIME:20210317T113000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25782@indico.mpp.mpg.de
DESCRIPTION:Speakers: Thomas Van Riet ()\nI present evidence\, both from a
GR and a holographic viewpoint\, that Coleman's Euclidean axion wormholes
do not contribute to the path integral. \n\n45' talk + 15' discussion\n\
nhttps://indico.mpp.mpg.de/event/7856/contributions/25782/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25782/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening address
DTSTART;VALUE=DATE-TIME:20210317T092000Z
DTEND;VALUE=DATE-TIME:20210317T093000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25915@indico.mpp.mpg.de
DESCRIPTION:Speakers: Dieter Lüst ()\nhttps://indico.mpp.mpg.de/event/785
6/contributions/25915/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25915/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The OPE Randomness Hypothesis and Euclidean Wormholes
DTSTART;VALUE=DATE-TIME:20210317T123000Z
DTEND;VALUE=DATE-TIME:20210317T133000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25783@indico.mpp.mpg.de
DESCRIPTION:Speakers: Alex Belin ()\nRecent developments in holography ind
icate that the semi-classical Euclidean path-integral of Einstein gravity
is much more powerful than previously anticipated. It is capable of reprod
ucing a unitary Page curve for black hole evaporation\, and can even captu
re some features of the discrete nature of black hole microstates. Wormhol
e geometries play a key role in this context. I will propose a mechanism t
o explain this in the CFT: the OPE Randomness Hypothesis. This ansatz is a
generalization of the Eigenstate Thermalization Hypothesis which applies
to chaotic CFTs\, and treats OPE coefficients of heavy operators as random
variables with a given probability distribution. I will present two appli
cations of this framework: First\, it resolves a factorization puzzle in A
dS_3/CFT_2 due to the genus-2 wormhole\, as raised by Maoz and Maldacena.
Second\, it provides an argument against global symmetries in quantum grav
ity.\n\n45' talk + 15' discussion\n\nhttps://indico.mpp.mpg.de/event/7856/
contributions/25783/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25783/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum BTZ black hole
DTSTART;VALUE=DATE-TIME:20210319T160000Z
DTEND;VALUE=DATE-TIME:20210319T170000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25807@indico.mpp.mpg.de
DESCRIPTION:Speakers: Roberto Emparan ()\nThe study of quantum effects on
black holes including their gravitational backreaction is an important but
notoriously hard problem. I will begin by reviewing how the framework of
braneworld holography allows to solve it for strongly-coupled quantum conf
ormal fields. Then I will describe a holographic construction of quantum r
otating BTZ black holes (quBTZ) using an exact dual four-dimensional bulk
solution. Besides yielding the quantum-corrected geometry and the renormal
ized stress tensor of quBTZ\, we use it to show that the quantum black hol
e entropy\, which includes the entanglement of the fields outside the hori
zon\, rather non-trivially satisfies the first law of thermodynamics\, whi
le the Bekenstein-Hawking-Wald entropy does not.\n\n45' talk + 15' discuss
ion\n\nhttps://indico.mpp.mpg.de/event/7856/contributions/25807/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25807/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comments on Euclidean wormholes and holography
DTSTART;VALUE=DATE-TIME:20210317T163000Z
DTEND;VALUE=DATE-TIME:20210317T173000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25787@indico.mpp.mpg.de
DESCRIPTION:Speakers: Panos Betzios ()\nEuclidean wormholes comprise exoti
c types of gravitational solutions\, that still challenge our physical int
uition and understanding. In the first part of the talk\, I will analyse a
symptotically AdS wormhole solutions in the context of holography. From a
bottom up perspective a study of correlation functions of local and non-lo
cal operators indicates the universal properties that any putative hologra
phic dual should exhibit. The system is very weakly cross-coupled in the U
V\, and becomes strongly cross-coupled in the IR. In the second part\, I w
ill describe some concrete field theoretic setups which exhibit such a beh
aviour and comment on various issues arising in the alpha-parameter interp
retation of the wormhole gas.\n\n45' talk + 15' discussion\n\nhttps://indi
co.mpp.mpg.de/event/7856/contributions/25787/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25787/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phases of Holographic Interfaces
DTSTART;VALUE=DATE-TIME:20210318T093000Z
DTEND;VALUE=DATE-TIME:20210318T103000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25793@indico.mpp.mpg.de
DESCRIPTION:Speakers: Costas Bachas ()\nDomain walls between Anti-de Sitte
r vacua are important for the study of the string-theory landscape\, and e
nter in recent toy models of black hole evaporation. In this talk I will d
escribe the phase diagram of a simple 2+1 dimensional model of thin domain
walls anchored at the AdS boundary\, and I will comment on its dual holo
graphic interpretation. \n\n45' talk + 15' discussion\n\nhttps://indico.mp
p.mpg.de/event/7856/contributions/25793/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25793/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Complexity\, Integrability\, and Chaos
DTSTART;VALUE=DATE-TIME:20210317T133000Z
DTEND;VALUE=DATE-TIME:20210317T143000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25784@indico.mpp.mpg.de
DESCRIPTION:Speakers: Vijay Balasubramanian ()\nThe states of quantum syst
ems grow in complexity over time as entanglement spreads between degrees o
f freedom. Following ideas in computer science\, we formulate the complex
ity of evolution as the length of the shortest geodesic on the unitary gro
up manifold between the identity and the time evolution operator\, and use
the SYK family of models with N fermions to study this quantity in free\,
integrable\, and chaotic systems. In all cases\, the complexity initiall
y grows linearly in time\, and the shortest path lies along the physical t
ime evolution. This linear growth is eventually truncated by "shortcuts"
on the unitary manifold that are shorter than the physical time evolution.
We explicitly locate such shortcuts and hence show that in the free theo
ry\, shortcuts occur at a time of O(N^1/2)\, truncating complexity growth
at this scale. We also find an explicit operator which "fast-forwards" tim
e evolution with this complexity. In a class of integrable theories\, we
show that shortcuts appear in a time upper bounded by O(poly(N))\, again t
runcating complexity growth. Finally\, in chaotic theories we argue that
shortcuts do not occur until exponential times\, after which it becomes po
ssible to find infinitesimally nearby fixed-complexity approximations to t
he time evolution operator. We relate these results to the Eigenstate Com
plexity Hypothesis\, a new criterion on the spectrum of energy eigenstates
that guarantees an exponential increase of complexity over time that is c
onsistent with maximal chaos. \n\n45' talk + 15' discussion\n\nhttps://ind
ico.mpp.mpg.de/event/7856/contributions/25784/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25784/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the geometry of quantum complexity
DTSTART;VALUE=DATE-TIME:20210318T153000Z
DTEND;VALUE=DATE-TIME:20210318T163000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25799@indico.mpp.mpg.de
DESCRIPTION:Speakers: Roberto Auzzi ()\nComputational complexity is a quan
tum information concept that recently has found applications in holography
. I will consider quantum computational complexity for n qubits using Niel
sen's geometrical approach. In the definition of complexity there is a big
amount of arbitrariness due to the choice of the penalty factors\, which
parameterize the cost of the elementary computational gates. In order to r
eproduce desired features in holography\, negative sectional curvatures ar
e required. With the simplest choice of penalties\, this is achieved at th
e price of singular curvatures in the large n limit. I will consider a cho
ice of penalties in which negative curvatures can be obtained in a smooth
way. I will also talk about the relation between operator and state compl
exities\, framing the discussion in the language of Riemannian submersions
. Finally\, I'll discuss conjugate points for a large number of qubits in
the unitary space and I'll provide a strong indication that maximal comple
xity scales exponentially with the number of qubits in a certain regime of
the penalties space. \n\n45' talk + 15' discussion\n\nhttps://indico.mpp.
mpg.de/event/7856/contributions/25799/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25799/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Page Curve from Holographic Moving Mirror and End of the World bra
ne
DTSTART;VALUE=DATE-TIME:20210319T093000Z
DTEND;VALUE=DATE-TIME:20210319T103000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25802@indico.mpp.mpg.de
DESCRIPTION:Speakers: Tadashi Takayanagi ()\nIn this talk we calculate the
entanglement entropy in the presence of a moving mirror in a CFT. We empl
oy the AdS/BCFT construction to describe a gravity dual of moving mirrors.
We will show that the time evolution of entanglement entropy for a class
of moving mirror\, which models an evaporating black hole\, follows an ide
al page curve. In this gravity dual of this model and also in earlier work
s on holographic page curves\, the end of the world-brane in AdS plays a c
rucial role. I will also present our recent result on their chaotic spectr
um in holographic CFTs.\n\n45' talk + 15' discussion\n\nhttps://indico.mpp
.mpg.de/event/7856/contributions/25802/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25802/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complexity for CFTs in General Dimensions
DTSTART;VALUE=DATE-TIME:20210318T163000Z
DTEND;VALUE=DATE-TIME:20210318T173000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25800@indico.mpp.mpg.de
DESCRIPTION:Speakers: Shira Chapman ()\nIn this talk I will discuss circui
t complexity in the setting of higher dimensional conformal field theories
. I will consider unitary gates built from a representation of the conform
al group\, two different circuit cost functions defined using either the F
ubini-Study metric or the one-norm\, and paths that start from an initial
spinless primary state. We will see that the resulting Fubini-Study metric
is the metric on a particular coadjoint orbit of the conformal group\, wh
ile the one-norm computes the geometric action associated to this orbit. T
his generalizes recent results in 2d connecting the one-norm to a Virasoro
geometric action\, and also shows that coadjoint orbits provide a unified
geometric framework that applies to different choices of cost functions.
I will end with some comments about symmetry groups other than the conform
al group\, using group theoretic generalizations of coherent states. This
is based on a work with Nicolas Chagnet\, Jan de Boer and Claire Zukowski.
\n\n45' talk + 15' discussion\n\nhttps://indico.mpp.mpg.de/event/7856/cont
ributions/25800/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25800/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Islands and Hawking radiation correlations of evaporating black ho
les
DTSTART;VALUE=DATE-TIME:20210317T153000Z
DTEND;VALUE=DATE-TIME:20210317T163000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25786@indico.mpp.mpg.de
DESCRIPTION:Speakers: Prem Kumar ()\nWe consider the effect of shockwaves
on the entanglement structure of black holes. We examine the correlatio
ns in generic subsets of the Hawking radiation emitted by evaporating blac
k holes following the shockwave insertion and find a zoo of competing isla
nd saddle points for the associated entanglement entropies. By computing t
he mutual information between early and late modes we establish long range
correlations in the Hawking radiation.\n\n45' talk + 15' discussion\n\nht
tps://indico.mpp.mpg.de/event/7856/contributions/25786/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25786/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The principle of holography of information and its low-energy test
s
DTSTART;VALUE=DATE-TIME:20210319T103000Z
DTEND;VALUE=DATE-TIME:20210319T113000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25803@indico.mpp.mpg.de
DESCRIPTION:Speakers: Suvrat Raju ()\nThe principle of holography of infor
mation states that\, in any theory of quantum gravity\, a copy of all the
information available on a Cauchy slice is also available near the boundar
y of the slice. This principle can be made precise and proved\, under weak
assumptions\, for theories of gravity in AdS and in flat space and it has
interesting implications for black holes. In this talk\, we will describe
how this principle can be tested within the realm of low-energy effective
field theory. We will describe how observers placed in a low-energy state
near the boundary of AdS can use a simple physical protocol to completely
identify the state of the bulk without directly visiting the bulk. We wil
l also describe low-energy thought experiments that can be used to similar
ly obtain information about the bulk state from near the boundary of flat
space.\n\n45' talk + 15' discussion\n\nhttps://indico.mpp.mpg.de/event/785
6/contributions/25803/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25803/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pole skipping away from maximal chaos
DTSTART;VALUE=DATE-TIME:20210318T123000Z
DTEND;VALUE=DATE-TIME:20210318T133000Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25795@indico.mpp.mpg.de
DESCRIPTION:Speakers: Gábor Sárosi ()\nThe pole skipping phenomenon is a
subtle effect in the thermal energy density retarded two point function a
t a special point in the complex frequency and momentum planes. For maxima
lly chaotic theories\, this special point is related to data characterisin
g the butterfly effect\, and is explained by a common dynamical origin of
energy transport and scrambling. I will argue that pole skipping also happ
ens in non-maximally chaotic theories and its location corresponds to the
stress tensor contribution to many body chaos. I will test this proposal i
n the large q limit of an SYK chain\, where I determine both the Lyapunov
growth of the OTO correlator and the energy density two point function exa
ctly as a function of the coupling\, interpolating between weekly coupled
and maximally chaotic behaviour. \n\n45' talk + 15' discussion\n\nhttps://
indico.mpp.mpg.de/event/7856/contributions/25795/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25795/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion session: Holographic Complexity
DTSTART;VALUE=DATE-TIME:20210319T123000Z
DTEND;VALUE=DATE-TIME:20210319T131500Z
DTSTAMP;VALUE=DATE-TIME:20210420T221932Z
UID:indico-contribution-7856-25805@indico.mpp.mpg.de
DESCRIPTION:Speakers: Johanna Erdmenger ()\nComputational complexity is a
notion from information theory\, initially defined for finite-dimensional
systems\, measuring the number of gates that have to be applied to a given
reference state to reach a target state. Susskind’s proposals for defin
ing computational complexity also for characterising quantum properties bl
ack holes have triggered significant interest in defining computational co
mplexity also for quantum field theories\, i.e. for infinite-dimensional H
ilbert spaces. The idea is to establish a precise holographic dictionary f
or complexity. There are successful proposals for complexity definitions i
n free quantum field theory. Recently\, there have been several proposals
also for interacting theories\, mostly in the context of conformal field t
heories\, building gate sets from symmetry generators. Questions to be dis
cussed include\, in addition to further questions about the talks on the s
ubject presented at the workshop: - What is the status of defining complex
ity for interacting field theories? - How do different proposals for gate
sets\, reference states and cost functions compare to each other? - What i
s the status of establishing a holographic dictionary? - What are promisin
g avenues to be pursued for further progress?\n\nhttps://indico.mpp.mpg.de
/event/7856/contributions/25805/
LOCATION:
URL:https://indico.mpp.mpg.de/event/7856/contributions/25805/
END:VEVENT
END:VCALENDAR