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18/07/2022, 08:00
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Christof Gattringer, Regina Hitzenberger18/07/2022, 08:45
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Emil Martinec18/07/2022, 09:00Review Talk
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Natalie Paquette18/07/2022, 10:00Invited Talk
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Edward Witten18/07/2022, 11:00Invited Talk
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Shira Chapman18/07/2022, 11:30
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Vijay Balasubramanian18/07/2022, 12:00
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Monica Guica18/07/2022, 14:00
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Daniel Harlow18/07/2022, 15:00
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Maxim Pospelov18/07/2022, 16:00
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Tom Rudelius18/07/2022, 16:30
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Liam McAllister18/07/2022, 17:00
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Andreas Karch19/07/2022, 09:00
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Amit Sever19/07/2022, 10:00
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Hong Liu19/07/2022, 11:00Invited Talk
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Nick Evans19/07/2022, 11:30
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Luca Iliesiu19/07/2022, 12:00
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Shlomo Razamat19/07/2022, 14:00Review Talk
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James Sparks19/07/2022, 15:00
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Julian Sonner (chair), Alexandre Belin, Lorenz Eberhardt, Alexander Maloney, Olga Papadoulaki19/07/2022, 16:00
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Joe Minahan (chair), Agnese Bissi, Shai Chester, Nikolay Gromov, Shota Komatsu19/07/2022, 16:00
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Cumrun Vafa (chair), Chethan Krishnan, Miguel Montero, Thomas Van Riet19/07/2022, 16:00
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19/07/2022, 19:00
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Daniel Waldram20/07/2022, 09:00
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Sara Pasquetti20/07/2022, 10:00
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Juan Maldacena20/07/2022, 11:00Invited Talk
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Dionysios Anninos20/07/2022, 11:30
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Kostas Skenderis20/07/2022, 12:00
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Mithat Ünsal20/07/2022, 12:30
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20/07/2022, 14:30
For possible afternoon program activities please look in the "Outdoor activities" for more information.
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20/07/2022, 19:00
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Umut Gürsoy21/07/2022, 09:00Review Talk
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Eric Perlmutter21/07/2022, 10:00Invited Talk
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Andrew Strominger21/07/2022, 11:00Invited Talk
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Alok Laddha21/07/2022, 11:30Invited Talk
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Ana-Maria Raclariu21/07/2022, 12:00Invited Talk
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Michael Walter21/07/2022, 14:00
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Jaroslav Trnka21/07/2022, 15:00Invited Talk
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David Kosower21/07/2022, 15:30Invited Talk
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Francesco Benini22/07/2022, 09:00Review Talk
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Zohar Komargodski22/07/2022, 10:00
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Aninda Sinha22/07/2022, 11:00
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Emily Nardoni22/07/2022, 11:30
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Seung-Joo Lee22/07/2022, 12:00
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Susanne Reffert22/07/2022, 14:00
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Kantaro Ohmori22/07/2022, 14:30Invited Talk
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Iñaki García-Etxebarria22/07/2022, 15:00Invited Talk
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Agnese Bissi22/07/2022, 16:00
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Shing-Tung Yau22/07/2022, 16:20
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Ahmed Almheiri22/07/2022, 16:25
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Rajesh Gopakumar22/07/2022, 16:30
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Hirosi Ooguri22/07/2022, 16:50
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22/07/2022, 19:00
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23/07/2022, 19:00
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Max Guillen (Uppsala University)Poster
In this contribution I will explain how to use 11D pure spinors to compute 3-point scattering amplitudes of 11D supergravity physical states in a manifestly super-Poincare covariant manner. I will also discuss some work in progress which aims to generalize these ideas to an arbitrary number of external states, and its implications for the pure spinor supermembrane.
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Veronica Pasquarella (DAMTP, University of Cambridge, UK)Poster
We show that the behaviour of 2D vacuum transitions is reminiscent of the CFT$_2$/CFT$_1$ correspondence. In doing so, we perform the calculation in 3 different methods, namely the Euclidean formalism of Coleman-de Luccia and Brown-Teitelboim, and the Hamiltonian method of Fischler, Morgan and Polchinski. The bounces from the Euclidean methods are always proportional to the central charge,...
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Mario De Marco (SISSA)Poster
We classify rank zero 5d SCFTs geometrically engineered from M-theory on quasi-
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homogeneous compound Du Val isolated threefold singularities. For all such theories,
we characterize the Higgs Branch, by computing the dimension, the continuous and
discrete symmetry groups, as well as more refined details such as the charges of the
hypermultiplets under these groups. We derive these data by... -
Romain RuzziconiPoster
We propose a holographic description of gravity in 4d asymptotically flat spacetime in terms of a 3d sourced conformal Carrollian field theory. The external sources encode the leaks of gravitational radiation at null infinity. The Ward identities of this theory are shown to reproduce those of the 2d celestial CFT after relating Carrollian to celestial operators. This suggests a new set of...
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Ioannis Tsiares (Institut de Physique Theorique, CEA-Saclay)Gong Show Talk
Two-dimensional Conformal Field Theories (CFTs) are defined via a list of primary operators, along with their scaling dimensions, spins and OPE coefficients. This set of data, along with the central charge, uniquely defines any correlation function of the theory on an arbitrary Riemann surface. Using consistency conditions like crossing symmetry and modular invariance, one can show that there...
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Ioannis Tsiares (Institut de Physique Theorique, CEA-Saclay)Poster
Two-dimensional Conformal Field Theories (CFTs) are defined via a list of primary operators, along with their scaling dimensions, spins and OPE coefficients. This set of data, along with the central charge, uniquely defines any correlation function of the theory on an arbitrary Riemann surface. Using consistency conditions like crossing symmetry and modular invariance, one can show that there...
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Dr Sebastian Waeber (University of Washington & Technion - Israel Institute of Technology)Poster
Further progress in simulating heavy ion collisions via holography, beyond the collision of localized, broad, Gaussian shocks, is held back by numerical difficulties of solving 5D Einstein equations with initial conditions corresponding to localized projectiles with a large difference between longitudinal and transverse scales. Recent techniques are discussed which turn this obstacle into an...
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Francesco Galvagno (ETH Zürich)Poster
We consider a special family of 4-d $\mathcal{N}=2$ superconformal theories, arising as orbifolds of $\mathcal{N}=4$ SYM under the action of a discrete group, realizing a circular quiver theory. Following the recent Gaberdiel-Gopakumar derivation, we construct a free field worldsheet theory in the tensionless string limit which is dual to the orbifold gauge theory at the free theory point. In...
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Dr Emine Seyma KutlukPoster
We use a trick similar to that of Weinberg’s for adiabatic modes, in a Manton approximation for general relativity on a spacetime whose spatial slices have a boundary. We show that this results in a description of the slow-time dependent solutions as null geodesics on the space of boundary diffeomorphisms, with respect to a metric we prove to be composed solely of the boundary data. We...
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Robert Knighton JrPoster
Much recent progress has been made in understanding the 'tensionless' limit of the AdS$_3$/CFT$_2$ correspondence directly using powerful worldsheet CFT methods. For closed strings, the correspondence between partition functions and correlation functions is fairly well understood. Using methods of boundary conformal field theory, we explore the dynamics of strings in D-brane and O-plane...
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Ms Adrita Chakraborty (Indian Institute of Technology Kharagpur)Poster
We establish 1d Neumann-Rosochatius (NR) integrable model for rotating and pulsating string ansatz in some less conventional 2d nonlinear string sigma models, specifically, the fundamental string probing the gravity background of planar ABJ theory and the manifest SL(2, Z) covariant (p,q)-type bound states of fundamental string and D1 branes in $AdS_3\times S^3\times T^4$ background with mixed...
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Dimitrios Toulikas (IPhT, Universite Paris-Saclay, CEA)Poster
Despite two decades of efforts, constructing metastable de Sitter vacua in String Theory continues to be a great challenge and the almost twenty-year-old construction of Kachru, Kallosh, Linde and Trivedi (KKLT), although not uncontested, remains the prototypical example. This proposal is a three-step construction that combines fluxes, non-perturbative phenomena and anti-D3 branes in a warped...
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Moritz Dorband (Julius-Maximilians University Würzburg)Poster
The AdS/CFT correspondence states that certain CFTs admit a description in terms of a gravitational theory in asymptotically AdS geometries of one dimension more. one of the most fascinating examples of this correspondence is the ER = EPR proposal that relates entanglement in the boundary gauge theory to a gravitational wormhole connecting two asymptotic regions of an eternal black hole in its...
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Cristoforo Iossa (SISSA, Trieste; INFN, Trieste)Poster
Reversing the logic of the bootstrap approach in Liouville CFT we explicitly compute the connection formulae for degenerate conformal blocks. In the semiclassical limit of the theory, this amounts to solving the connection problem of Fuchsian ODEs. Generalizing to irregular insertions we solve as well for various confluences. Concentrating on the Heun equation and its confluences, we can solve...
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Cristoforo Iossa (SISSA, Trieste; INFN, Trieste)Gong Show Talk
Reversing the logic of the bootstrap approach in Liouville CFT we explicitly compute the connection formulae for degenerate conformal blocks. In the semiclassical limit of the theory, this amounts to solving the connection problem of Fuchsian ODEs. Generalizing to irregular insertions we solve as well for various confluences. Concentrating on the Heun equation and its confluences, we can solve...
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Praxitelis Ntokos (University of Edinburgh)Poster
In the last few years, there has been enormous progress on the statistical description of the entropy of BPS black holes in AdS$_D$ for $D>3$ in terms of states in the dual field theory. The success of such developments relies on the existence of an extremisation principle in the bulk which maps to the evaluation of the partition function in the field theory in the large charge limit. I will...
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Krishan Saraswat (Perimeter Institute for Theoretical Physics)Poster
Holographic investigations have revealed the importance of quantum chaos and random matrix theory in the unitary description of black holes. The spectral form factor associated with the $e^{S_{BH}}$ microstates that compose the black hole serve as a simple proxy for studying how perturbations to black holes thermalize. I will discuss how the details of the spectral statistics of the...
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Julius Julius (King's College London)Poster
I will describe the “bootstrability” program, which combines integrability techniques in 4d N = 4 supersymmetric Yang-Mills (SYM) and the conformal bootstrap to study beyond-the-spectrum observables in a CFT.
Focussing on the 1d defect CFT living on the Maldacena-Wilson line in N = 4 SYM, I will show how the quantum spectral curve (QSC), a powerful integrability based method solves its...
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Julien Barrat (Humboldt Universität zu Berlin)Poster
Tremendous progress has been achieved during the last years in bootstrapping conformal correlators at strong coupling using analytical bootstrap methods and the AdS/CFT correspondence. In particular the development of Lorentzian inversion formulae revealed helpful in reconstructing four-point functions. In this work we present how this technology can be adapted to defect setups in order to...
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Maxim Pavlov (Vrije Universiteit Brussel), Philip Hacker (Vrije Universiteit Brussel)Poster
In recent years, complexity has gained a lot of interest in the study of holography and has been subject to a number of holographic proposals. While first defined and studied in the context of quantum computation in terms of discrete operations in the form of gates, a continuous generalization of complexity has been introduced by Nielsen et al. In this picture, the complexity of given unitary...
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Dr Poulami Nandi (Indian Institute of Technology Gandhinagar)Poster
It is more than 20 years since the advent of the famed AdS/CFT correspondence, which has given a firm footing to the idea of holography. Our physical world is, however, clearly not AdS. For many applications, especially astrophysical ones, the universe can be approximated by an asymptotically flat spacetime. It is thus of great importance to extend the notion of holography from its original...
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Goncalo Araujo-Regado (University of Cambridge)Gong Show Talk
We show how to construct an explicit map between boundary states and quantum gravity states in AdS/CFT via a specific field theory path integral on a bulk Cauchy slice, rather than on the asymptotic boundary. The field theory is constructed from the boundary CFT via an irrelevant deformation, which is the analogue of the well-known $T\bar{T}$ operator in two boundary dimensions. Our...
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Goncalo Araujo-Regado (University of Cambridge)Poster
We show how to construct an explicit map between boundary states and quantum gravity states in AdS/CFT via a specific field theory path integral on a bulk Cauchy slice, rather than on the asymptotic boundary. The field theory is constructed from the boundary CFT via an irrelevant deformation, which is the analogue of the well-known $T\bar{T}$ operator in two boundary dimensions. Our...
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Yorgo PanoPoster
Celestial holography conjectures a duality between a theory of quantum gravity living in the bulk of an asymptotically flat spacetime and a codimension 2 conformal field theory living on its boundary. I will present some motivation to this correspondence, namely by looking at the soft sector of scattering amplitudes and their relation to asymptotic symmetries. These can be seen as generated by...
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Sudip Ghosh (Indian Institute of Science)Poster
We consider 2-to-2 celestial scattering amplitudes for massless external particles in d=4 dimensions using crossing symmetric dispersion relations employed in recent studies of the S-matrix bootstrap. The crossing symmetric dispersive representation of the amplitude has spurious singularities for complex values of the celestial cross-ratio z, which need to be removed in local QFTs. We show...
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Elizabeth HimwichGong Show Talk
The Lorentz symmetry of four-dimensional (4D) scattering is isomorphic to two-dimensional (2D) global conformal symmetry. As a consequence, amplitudes in 4D momentum space can be naturally recast via a Mellin transform as correlation functions of 2D ''celestial'' conformal primary operators. In this talk, I will describe results (with M. Pate and K. Singh) on operator product expansions of...
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Jacob Michael Leedom (DESY)Poster
I will discuss ensemble averages of two-dimensional conformal field theories associated with an arbitrary indefinite lattice with integral quadratic form Q. I will provide evidence that the holographic dual after the ensemble average is the three-dimensional Abelian Chern-Simons theory with kinetic term determined by Q. The resulting partition function can be written as a modular form,...
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Suman Kundu (TIFR, Mumbai)Poster
We will explain that the Lorentzian CFT (time-ordered and OTOC) has a far richer structure and becoming more and more important. In CFT correlators generically there are branch points at $0,1$, and $\infty$ in the correlators. Whenever two operators cross their lightcones they go through a monodromy around one of the branch points. A natural and very important question is,
- Can one...
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Maor Ben-Shahar (Uppsala University)Poster
Chern-Simons theory obeys the color-kinematics duality off-shell, and admits an off-shell double-copy. The off-shell duality is the result of there being volume preserving diffeomorphisms hidden in the Feynman rules. This can be extended to the ghost sectors by using a suitable superspace formulation of the theory. On-shell, there is an N=4 adjoint matter theory that obeys the duality and can...
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Torsten Weber (University of Regensburg)Poster
In the last years the discovery of the duality between JT quantum gravity and a double-scaled matrix model [1] has led to an intense cross-fertilization between the fields of holography and quantum chaos. Starting on the quantum chaos side, we investigate the implications imposed by the universal RMT behaviour of the matrix model [2] on JT gravity. Specifically we show how the consistency of...
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Anthony HouppePoster
Microstate geometries in string theory replace the black-hole horizon with a smooth geometric "cap" at the horizon scale. Famous examples of such geometries include so-called "superstrata", which are microstates of the extremal three-charge black hole in six dimensions, and whose holographic duals are very well understood.
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Because of the huge simplifications provided by the BPS equations,... -
Karapet MkrtchyanPoster
A simple Lorentz-covariant formulation for abelian self-interacting p-forms is derived. This includes a democratic formulation of non-linear electrodynamics (featuring both electric and magnetic potentials) and its p-form generalizations, as well as interacting self-dual p=2k-forms in d=4k+2 dimensional Minkowski space. In particular, an explicit covariant Lagrangians for all SO(2)-duality...
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Niklas Beisert (ETH Zürich)Poster
Global Warming is a clear and present danger for humankind. Halting it
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in time will require technological advances and societal changes at
impressive scales and rates. Both, Global Warming and mitigation efforts
will have an impact on the way we conduct research. What should we do?
What will you do? -
Atakan Hilmi FiratPoster
I will explain how one can fix the normalization of the D-instanton contribution to the superpotential in type II string theory on Calabi-Yau orientifolds using string field theory and show such normalization is holomorphic function of the moduli. I will also argue for the absence of multi-instanton contribution to the superpotential in these scenarios. Based on 2204.02981.
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Suzanne Bintanja (University of Amsterdam)Poster
We analyze how deforming symmetric product orbifolds of two-dimensional $\mathcal{N}=2$ conformal field theories by an exactly marginal operator lifts higher spin currents present at the orbifold point. We find on the one hand that these currents are universally lifted regardless of the underlying CFT. On the other hand the details of the lifting are surprisingly non-universal, with dependence...
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Yixuan Li (IPhT Saclay)Gong Show Talk
Large classes of supergravity solutions that appear to be coherent microstates of the D1-D5-P black hole have been found by the Microstate Geometries program. These solutions have a smooth cap at the bottom of a long but finite throat, replacing the black hole's horizon lying at the bottom of an infinitely-long throat. Because of gravitational blueshift, a small amount of energy as seen from...
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Yixuan Li (IPhT Saclay)Poster
Large classes of supergravity solutions that appear to be coherent microstates of the D1-D5-P black hole have been found by the Microstate Geometries program. These solutions have a smooth cap at the bottom of a long but finite throat, replacing the black hole's horizon lying at the bottom of an infinitely-long throat. Because of gravitational blueshift, a small amount of energy as seen from...
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Mikhail KhramtsovPoster
In this work we revisit the model of AdS$_2$ black hole in JT gravity evaporating into an external bath. We study when and how much information about the black hole interior can be accessed in these models through different portions of the Hawking radiation collected in the bath, and we obtain the corresponding full quantitative Page curves. As a refinement of previous results, we describe the...
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Florian EckerPoster
I introduce a family of 2D dilaton gravity models with state-dependent constant curvature
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so that dS2 emerges as an excitation of AdS2. Curiously, the strong coupling region corre-
sponds to the asymptotic region geometrically. Apart from these key differences, many fea-
tures resemble the Almheiri–Polchinski model. I also discuss perturbative and non-perturbative
thermodynamical... -
Ian Nagle (Macquarie University)Poster
We investigate the dynamical gravitational Wald entropy associated with spacetimes imbued with conformal killing horizons by using covariant phase space methods. We extend the Frobenius surface gravity formula to conformal Killing horizons, yielding a new generalized expression involving the conformal factor. The Wald entropy takes a modified form, with dependence on the conformal factor. We...
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Lecheng Ren (Brown University)Poster
The material is based on the previous paper 2111.11356 and also a paper to appear collaborating with Anastasia Volovich and Akshay Yellespur. We compute the deformation of the w1+∞ algebra of soft graviton, gluon and scalar currents in the Celestial CFT due to non-minimal couplings. Such deformed algebra shares some similarities with the W(1+infinity) algebra but has essential differences. We...
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Ivano BasilePoster
We address instabilities of AdS flux vacua arising from string theory with string-scale supersymmetry breaking. The semiclassical regime, sourced by branes, eventually decays in a chain of tunneling processes, and we study the resulting final state using holography. We connect this setting with a number of swampland conditions, most prominently the emergent string proposal: D1-brane final...
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Ken KikuchiPoster
We propose a renormalization group flow with emergent supersymmetry in two dimensions from a non-Lagrangian theory. The ultraviolet theory does not have supersymmetry while the infrared theory does. The flow is constrained analytically by topological defect lines including a new spin constraint, and further supported by numerics from the truncated conformal space approach.
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Mr Jaydeep Kumar Basak (Indian Institute of Technology Kanpur, India)Poster
We advance two alternative proposals for the island contributions to the entanglement negativity of various pure and mixed state configurations in quantum field theories coupled to semiclassical gravity. The first construction involves the extremization of an algebraic sum of the generalized Renyi entropies of order half. The second proposal involves the extremization of the sum of the...
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Ji Hoon Lee (Perimeter Institute)Poster
We study how the microstates of BPS sectors in string theory are encoded in the dual $U(N)$ gauge theory. The microstates take the form of a coherent sum of stacks of branes and their open/closed string excitations. We propose a prescription to construct the indices of string/brane configurations by analyzing the modifications of determinant operators in gauge theory. The strings and branes...
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Nizar EzrouraPoster
Motivated by recent studies of supersymmetric black holes, we revisit the phase diagram of AdS5 black holes, whether BPS or not, with particular emphasis on the role of rotation. We develop BPS thermodynamics systematically and note the differences and similarities with the thermodynamics of more familiar AdS black holes. We also explore the role of rotation in the attractor flow formalism for...
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Simon Pekar (UMONS)Poster
We present higher-spin algebras containing a Poincaré subalgebra and with the same set of generators as the Lie algebras that are relevant to Vasiliev’s equations in any space-time dimension D ≥ 3.
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Jani Kastikainen (Université Paris Cité)Poster
In this poster, I will briefly review renormalization group monotones (F-functions) of three dimensional quantum field theories and present our work on this topic. In our work (arXiv:2112.08715), we consider holographic F-functions in a top-down AdS/CFT setup involving flavored ABJM theory on a Euclidean 3-sphere. For quenched flavor, the holographic dual is type IIA supergravity with probe...
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Stefan Prohazka (University of Edinburgh)Gong Show Talk
Fractons are quasiparticles with the distinctive feature of having only limited mobility. This bizarre trait and their unusual symmetries also make the coupling to curved spacetime nontrivial. I will show how aristotelian geometry provides the right framework, review the state-of-the-art on this issue, provide a novel no-go theorem for theories with linear dipole symmetry, spatial derivatives...
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Emil HavePoster
Fracton phases of matter are characterised by excitations with restricted mobility. While much of their theoretical description remains shrouded in mystery, a robust line of attack involves their spacetime symmetries and their coupling to geometric backgrounds which realise these symmetries locally. One class of fracton theories derive their mobility constraints from a conserved dipole moment....
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Dr Stephen Angus (Asia Pacific Center for Theoretical Physics)Poster
I will discuss how fracton physics can be studied systematically within the geometric framework of double field theory (DFT). I will argue that the restricted mobility and large degeneracy of quantum states can be attributed to the generalized geodesics and infinite-dimensional isometries present in non-Riemannian backgrounds of DFT. Moreover, it turns out that a DFT Yang-Mills or Maxwell...
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Dr L GlaserPoster
Fuzzy spaces and matrix geometries are an evergreen topic in string theory.
They can also be arrived at from other directions, one of which is the theory of spectral triples.
In a spectral triple the geometric data of a manifold is encoded as an Algebra acting on a Hilbert space, with a compatible Dirac operator.In this poster I will show some results on fuzzy spaces from spectral...
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Nicolò ZenoniPoster
In the holographic framework, the evolution of black hole interiors is supposed to be captured by computational complexity, which heuristically quantifies the difficulty of preparing the dual state from a reference one by implementing elementary transformations. Employing the differential geometry toolkit, complexity can be defined as the length of shortest paths on proper manifolds.
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In this... -
Jack HoldenPoster
In gauge theories, spontaneous breaking of the centre symmetry provides a precise definition of deconfinement. In large-$N$ gauge theories, evidence has emerged recently that between confined and deconfined phases a partially-deconfined phase can appear, in which only a subset of colours deconfine. In the partially-deconfined phase, the centre symmetry is spontaneously broken, raising the...
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Andrea Sangiovanni (University of Trieste)Poster
The problem of explicitly computing Gopakumar-Vafa (GV) invariants of Calabi-Yau threefolds is, in most cases, challenging.
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We propose a novel way to fully characterize the GV invariants of singular Calabi-Yau threefolds arising from deformations of ADE singularities, employing a completely linear-algebraic method that computes zero-modes of an adjoint Higgs scalar, associated to the... -
Victoria MartinPoster
Hidden conformal symmetry (HCS) is the backbone of the proposed Kerr/CFT correspondence away from extremality. Recently this topic has gained a new lease on life, for three reasons: 1) the connection with the soft hair program, in which HCS acts non-trivially on the black hole horizon to generate soft hair, 2) the discovery of a set of globally defined HCS generators with a link to tidal Love...
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Weiming Zhao (Princeton University)Poster
Recent developments in massive on-shell scattering amplitudes in 4D have opened the door to understanding particle physics efficiently and theory-agnostically from an on-shell point-of-view, including on-shell notions of minimal coupling and black holes as elementary particles. Important special structures, like the x-factor, only appear when the masses of the particles look like they come...
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Colin SterckxPoster
We review recent progress stemming from the Type IIB S-folds program. S-folds are non-geometric backgrounds of type IIB supergravity of the form $\textrm{AdS}_4 \times \textrm{S}^1 \times \mathcal{M}$ involving a non-trivial $\textrm{SL}(2,\,\mathbb{Z})$ monodromy around the $\textrm{S}^1$. Engineering deformations of such backgrounds, we provide a mechanism for supersymmetry breaking that...
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Pavan Dharanipragada (IMSc Chennai)Poster
Holographic RG is the interpretation of the AdS-CFT correspondence as RG evolution of boundary theory. The radial coordinate is interpreted as the scale of the boundary theory. This allows a new physical way of looking at the correspondence. But, the precise regularisation of the boundary theory that allows this interpretation hasn't been looked at. I will show one such regularisation using...
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Mr Justin Kulp (Perimeter Institute)Gong Show Talk
4d holomorphic QFTs (such as those obtained from twisting N=1 QFTs) are endowed with extra structures and symmetries which are a 4d analogue of a 2d chiral algebra. In this talk, I will describe these holomorphic theories, higher structures that arise in studying loop corrections to the BRST differential, and a recursive "bootstrap" procedure for systematically computing these loop...
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Mr Justin Kulp (Perimeter Institute)Poster
4d holomorphic QFTs (such as those obtained from twisting N=1 QFTs) are endowed with extra structures and symmetries which are a 4d analogue of a 2d chiral algebra. In this poster, I will describe these holomorphic theories and their motivation, higher homological structures (analogous to $L_{\infty}$ algebras) that arise in studying loop corrections to the BRST differential, and a recursive...
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Kasia Budzik (Perimeter Institute)Poster
Holomorphic twists of $\mathcal{N}=1$ QFTs are defined by restricting to the cohomology of one supercharge, capturing the quarter-BPS operators that are counted by the supersymmetric index. We focus on the example of the holomorphic twist of pure $SU(N)$ gauge theory. We observe that the differential in the holomorphic twist receives loop corrections at all orders which make the theory...
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Daniele GregoriPoster
In the last couple of years, a new very surprising connection emerged between $\mathcal{N}=2$ supersymmetric gauge theory and black hole physics. Initially, it was found that quasinormal modes of black holes - as observed in the gravitational wave signal of the final ringdown phase of a merging - can be related and computed from quantization conditions on the so-called gauge theory...
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Sanjit ShashiPoster
We study black hole information and entanglement islands in higher dimensions (d > 2) using the bottom-up Karch-Randall-Sundrum braneworld construction. Earlier work in the double-holography literature embeds a single Randall-Sundrum brane in (d+1)-dimensional AdS gravity and uses the Karch-Randall mechanism to realize a theory of a gravitating braneworld coupled at infinity to a...
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David Kolchmeyer (Harvard University)Poster
I argue for the existence of single-trace, two-matrix models that are dual at the level of the disk to Jackiw-Teitelboim gravity minimally coupled to a massive scalar field. One matrix is interpreted as the Hamiltonian of the boundary quantum mechanical theory, while the other matrix is an operator that is dual to the bulk field. In one of the models, before the double-scaling limit is taken,...
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Nicola Andrea Dondi (University of Bern)Gong Show Talk
The conformal data of generic CFTs involving heavy charged operators can be organised as a series in inverse powers of the global charges involved. When extrapolating these expansions to light low-charge sectors, is it relevant to ask whether these series are divergent and Borel-summable. In this talk, I will show that the O(N) scalar CFT has a large-charge expansion which is not...
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Ronak Soni (DAMTP, University of Cambridge)Gong Show Talk
In the matrix quantum mechanics (MQM) dual to the non-supersymmetric 2d black hole, we identify a set of degenerate states as the black hole microstates. At leading order in large $N$, the log of number of these states (already calculated by Gross and Klebanov) matches the Bekenstein-Hawking entropy formula, and also agrees with one of two candidates found by Kazakov and Tseytlin. The mass...
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Trakshu Sharma (Tata Institute of Fundamental Research, Mumbai)Poster
We classify multi-partite entanglement measures and count them for large dimensional quantum systems. We compute these measures for two dimensional conformal field theories using twist operators and find that they are given by the lightest Virasoro conformal block in appropriate channel. In the limit of large central charge $c$, these blocks reduce to geodesic networks on the hyperbolic...
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Giulia Peveri (Humboldt University of Berlin)Poster
One dimensional CFTs are an exceptional laboratory in which we can test novel techniques in order to solve higher dimensional CFTs. They are also relevant from an holographic point of view, as in the case of the Wilson line defect in 4d N=4 Super Yang-Mills, which has an AdS_2 holographic dual. In this context, we focus on an under-explored subject: higher-point correlation functions. At weak...
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Priyadarshini Pandit (IIT kharagpur)Poster
Sigma model in AdS_{3}× S^{3} background supported by both NS-NS and R-R fluxes is one of the most distinguished integrable models. We study a class of classical string solutions for N-spike strings moving in AdS_{3}× S^{1} with angular momentum J in S^{1} ⊂ S^{5} in the presence of mixed flux. We observe that the addition of angular momentum J or winding number m results in the spikes getting...
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Dr Antonio PittelliPoster
We introduce a general systematic procedure to construct supersymmetric gauge theories on backgrounds with orbifold singularities, such as the spindle, and compute their partition functions. In addition to the presence of orbifold points, another novel aspect of our construction is that the background metric is allowed to be complex-valued. Combining this with supersymmetric localization leads...
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Yangrui HuPoster
D$p$-branes acquire effective nonlinear descriptions whose bosonic parts are related to the Born-Infeld action. This nonlinearity has been proven to be a consequence of the partial ${\cal N}=2\to{\cal N}=1$ supersymmetry breaking, originating from the solitonic nature of the branes. In this work, we focus on the effective descriptions of D2-branes, which play important roles in the Type IIA...
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Julian De Vuyst (OIST)Poster
In this work, we revisit the problem of finding entanglement islands in 2d Jackiw-Teitelboim (JT) gravity. We implement the following adjustments to the traditional setup: (1) we do not explicitly couple to a non-gravitating system, instead we implement only pure absorption into a fiducial detector, (2) we utilise the operationally defined renormalised matter entanglement entropy, as defined...
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Horatiu NastasePoster
We consider the Penrose limit of the MNa solution, a theory with spontaneous breaking of ${\cal N}=1$ supersymmetry in 3 dimensions, a case for which the holographic map is less understood. We compare the resulting pp wave and its string eigenstates to a sector of the theory on 5-branes reduced on $S^3$, and a spin chain-like system. We obtain many of the features of the pp wave analysis, but...
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Mr Ankit Aggarwal (Universite Libre de Bruxelles, University of Amsterdam)Poster
A first order phase transition for photons and gravitons in a Casimir box is studied analytically from first principles with a detailed understanding of symmetry breaking due to boundary conditions. It is closely related to Bose-Einstein condensation and accompanied by a quantum phase transition whose control parameter is the chemical potential for optical helicity.
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Adrian Sanchez Garrido (Universite de Geneve (CH))Poster
Krylov complexity is a notion of complexity that characterizes the spread of an operator over the algebra of observables by measuring its projection over a suitable orthonormal basis of this algebra built out of nested commutators of the Hamiltonian with the operator. Using this basis, operator dynamics can be mapped to a one-dimensional hopping problem. I will present recent results on the...
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Olga PapadoulakiGong Show Talk
I will present two protocols, that observers localized near the boundary of a spacetime can use to recover information about bulk excitations. The first protocol will be for the case of an asymptotically AdS spacetime and the second for an asymptotically flat spacetime. Although the specifics of the two protocols differ, they both demonstrate the principle of holography of information ---the...
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Naomi GendlerGong Show Talk
We show that the strong CP problem is solved in a large class of compactifications of string theory. The Peccei-Quinn mechanism solves the strong CP problem if the CP-breaking effects of the ultraviolet completion of gravity and of QCD are small compared to the CP-preserving axion potential generated by low-energy QCD instantons. We characterize both classes of effects. To understand quantum...
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John Donahue (New York University)Poster
The zigzag model is a relativistic integrable $N$-body system describing the leading high-energy semiclassical dynamics on the worldsheet of long confining strings in massive adjoint two-dimensional QCD. We discuss quantization of this model. We demonstrate that to achieve a consistent quantization of the model it is necessary to account for the non-trivial geometry of phase space. The...
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Anna-Lena WeigelPoster
Quantum circuits can be constructed from Virasoro symmetry transformations in a two-dimensional CFT. Employing the holographic dictionary we realize such circuits in AdS3 as a non-trivial time evolution of the bulk spacetime. This allows us to find holographic duals to CFT cost functionals such as the Fubini-Study metric.
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The same transformations we use to construct the circuits also give... -
Sinong Liu (Faculty of Physics, University of Warsaw)Poster
We find that the complexity of quantum many-body states, defined as a spread in the Krylov basis, may serve as a probe that distinguishes topological phases of matter. We illustrate this analytically in one of the representative examples, the Su-Schrieffer-Heeger model. Moreover, in the same setup, we analyze exactly solvable quench protocols where the evolution of the spread complexity shows...
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Pablo BasteiroPoster
As a new step towards defining complexity for quantum field theories, we map Nielsen operator complexity for $SU(N)$ gates to two-dimensional hydrodynamics. We develop a tractable large $N$ limit that leads to regular geometries on the manifold of unitaries as $N$ is taken to infinity. To achieve this, we introduce a basis of non-commutative plane waves for the $\mathfrak{su}(N)$ algebra and...
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Pablo BasteiroGong Show Talk
As a new step towards defining complexity for quantum field theories, we map Nielsen operator complexity for $SU(N)$ gates to two-dimensional hydrodynamics. We develop a tractable large $N$ limit that leads to regular geometries on the manifold of unitaries as $N$ is taken to infinity. To achieve this, we introduce a basis of non-commutative plane waves for the $\mathfrak{su}(N)$ algebra and...
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Muldrow Etheredge (University of Massachusetts Amherst)Poster
On the bulk side of the AdS/CFT correspondence, there is a TFT that controls which combinations of line operators are mutually local in the gauge theory side. We show that this TFT can be used to reproduce the line-operator classification of 4d gauge theories of Aharony, Tachikawa, and Seiberg.
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Andrea Manenti (Uppsala University)Gong Show Talk
I will discuss the analytic bootstrap technique applied to holographic superconformal field theories. In particular I will focus on $\mathcal{N}=4$ Super Yang-Mills and study correlators of quarter-BPS operators. Despite the fact that they are less protected than their half-BPS counterparts, these correlators can be constrained via the chiral algebra twist and this information is enough to...
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Timotej LemutPoster
Assuming only a known dispersion relation of single mode in the spectrum of a two-point function in some quantum field theory, we investigate when and how a reconstruction of the complete spectrum of physical excitations is possible. In particular, we develop a constructive algorithm based on the theorem of Darboux that allows for such a reconstruction when the associated spectral curve is...
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Miok Park (Institute for Basic Science (IBS))Poster
We revisit the no-hair theorems in Einstein-Scalar-Gauss-Bonnet theory with a general coupling function between the scalar and the Gauss-Bonnet term in four dimensional spacetime. We first resolve the conflict caused from the incomplete derivation of the old no-hair theorem by taking into account the surface term and restore its reliability. We also clarify that the novel no-hair theorem is...
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Simon LinPoster
Reflected entropy is a new quantum informatic quantity that has been shown to be dual to the area of entanglement wedge cross-section in holographic theories.
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We study reflected entropy of various states built form various Random Tensor Networks, a toy model that exhibits various features of holographic duality and show that the same result also holds.
For states built from a single (double)... -
Pietro Pelliconi (University of Geneva)Poster
Large black holes in anti-de Sitter space have positive specific heat and do not evaporate. In order to mimic the behavior of evaporating black holes, one may couple the system to an external bath. In this poster we explore a rich family of such models, namely ones obtained by coupling two holographic CFTs along a shared interface (ICFTs). We focus on the limit where the bulk solution is...
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Sudipta DuttaPoster
Recent attempts at the construction of holography for asymptotically flat spacetimes have taken two different routes. Celestial holography, involving a two dimensional (2d) CFT dual to 4d Minkowski spacetime, has generated novel results in asymptotic symmetry and scattering amplitudes. A different formulation, using Carrollian CFTs, has been principally used to provide some evidence for flat...
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Charles Thull (Uppsala University)Poster
It was recently suggested in [arXiv:1910.08555] that the spherical D6 brane solution of supergravity is dual to SYM on $S^7$ at small negative 't Hooft coupling. With the present work we investigate what happens to the SYM theory as one takes it from the true weak coupling regime through strong coupling to small negative coupling. Our guide is the simpler case of SYM on $S^5$, highlighting...
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Stefano Baiguera (Ben-Gurion University of the Negev)Poster
Charged and symmetry-resolved Rényi entropies are entanglement measures quantifying the degree of entanglement within different charge sectors of a theory with a conserved global charge. We use holography to determine the dependence of charged Rényi entropies on small shape deformations away from a spherical or planar entangling surface in general dimensions. This dependence is completely...
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Mr Andrea Arduino (University of Turin)Poster
The study of cosmological singularities in the context of string theory has been widely addressed on different time-dependent spacetime backgrounds and has never proved completely successful. Here we investigate the Null Boost Orbifold, which reproduces a Big-Bang type singularity but unfortunately suffers from unusual divergences when dealing with scattering amplitudes both in the closed and...
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Rene Meyer (JMU Würzburg)Poster
Quantum entanglement is the key resource employed in modern quantum computation. Different entanglement measures such as the entanglement entropy and Renyi entropies also provide useful information about the entanglement structure of quantum field the- ories, in particular at critical points. I will discuss the symmetry resolved entanglement and Renyi entropies, a fine-grained version of the...
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Chandramouli Chowdhury (ICTS-TIFR)Poster
We investigate the notion of asymptotic symmetries in classical gravity in higher even dimensions, with $D=6$ space-time dimensions as the prototype. Unlike in four dimensions, certain non-linearities persist which necessitates the complete non-linear analysis we undertake. We show that the free data is parametrized by a pair of symmetric trace-free tensors at future (past) null infinity. This...
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Hong Zhe (Vincent) Chen (Perimeter Institute)Poster
In previous work, a first law of generalized entropy was derived from semiclassical gravitational dynamics around thermal setups using an assumed relation between the matter modular Hamiltonian and the gravitational stress tensor. Allowing for non-minimal coupling between curvature and any tensor matter fields, we show however, that the modular Hamiltonian of thermal states is given by the...
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Nejc Čeplak (IPhT Saclay)Poster
One of the proposed resolutions of the information paradox is that black holes are described by ensembles of horizonless fuzzballs. Suitably coherent superpositions of such objects can be described within supergravity. Explicit examples are superstrata: smooth and horizonless microstates of the supersymmetric D1-D5-P black hole, which have a well defined dual description in terms of pure...
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Yoav Zigdon (Ben-Gurion University)Poster
In string theory, a thermal state is described by compactifying Euclidean time on a thermal circle $S^{1}_{\beta}$, of fixed circumference. However, this circumference is a dynamical field which could vary in space, therefore thermal equilibrium is not guaranteed. We discuss a thermal state of type II string theory near and above the Hagedorn temperature and show that the circumference of the...
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Sarah Racz (University of Texas at Austin)Poster
We study the effect of conserved charges on thermalization in quantum chaotic systems. Holographically, in the presence of a chemical potential, a non-monotonicity appears in the thermalization time as a function of chemical potential for small regions. To shed light on this behavior from the quantum side we study the dynamics of out of equilibrium states in finite-dimensional spin chains. Our...
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Mr Sergio Ernesto Aguilar Gutierrez (KU Leuven)Poster
We argue that an Euclidean supergravity vacuum solution of the form $\mathbb{R}\times S^1\times \mathbb{T}^8$ with imaginary self-dual $F_1$-flux through $\mathbb{R}\times S^1$ is the natural end to the chain of AdS$_d\times S^d\times \mathbb{T}^{10-2d}$-vacua with imaginary self dual $F_d$ flux, where $d\leq 5$. Such vacua come from the near-horizon of D($d-2$)/D($8-d$) branes and are...
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Robert Saskowski (University of Michigan, Ann Arbor)Poster
We discuss four-derivative corrections to pure $\mathcal{N}=2$, $D=5$ gauged supergravity, up to field redefinitions. In particular, the possible four-derivative corrections can be parametrized on-shell by a basis of five terms. We have found that, up to factors of the two-derivative action, supersymmetry picks out a unique set of coefficients for these terms, ie, there is a unique...
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Rahul PoddarPoster
An interesting class of integrable deformations of 2-dimensional quantum field theories are $\overline TT$ deformations. These deformations are well defined in any translationally invariant quantum field theory, including those without Lorentz invariance, such as Warped CFTs. Warped CFTs are the boundary dual to Warped AdS spacetimes, which are solutions to lower spin gravity. By adapting the...
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Kaiwen SunPoster
The elliptic genera of 2d (0,4) SCFTs for the BPS strings in 6d (1,0) SCFTs have been extensively studied in the past decade. By geometric engineering, they are equivalent to the refined topological string partition function on the underlying elliptic non-compact Calabi-Yau threefolds. Some 6d SCFTs allow twisted circle compactification, for example when the gauge algebra has an outer...
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Andreas Schachner (Cambridge University)Poster
We study the non-linear structure of Type IIB eight-derivative couplings involving the metric and the complexified three-form $G_3$. We show that, at the level of five-point string amplitudes, the kinematics in the maximally R-symmetry-violating sector is fully matched by standard superspace integrals and by superparticle amplitudes in M-theory on a two-torus. The latter approach is used to...
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Salvatore RAUCCI (Scuola Normale Superiore)Poster
We investigate codimension-one vacua resulting from low energy effective actions in ten-dimensional string models without tachyons.
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The main target is the non-supersymmetric Sugimoto USp(32) model, whose nine-dimensional solution is believed to contain backreacting 8-branes. We discuss the defects that interpolate between different vacua, possibly playing the role of the aforementioned... -
Houri Christina TaraziGong Show Talk
The five dimensional pure supergravity with 8 supercharges contains no dilaton making its string theory realization hard to get.
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I will be discussing previous attempts to realize the theory through non geometric constructions and provide reasons why this approach will fail. Additionally, I will discuss properties of the mysterious theory to assess its potential consistency as a quantum... -
Mr Davide Bufalini (University of Southampton)Poster
One of the most important objectives of string theory is to account for the bulk entropy of the 3-charge black hole. Some microstates may not have a reliable supergravity description, and thus models that capture stringy physics may be essential. I will present an exact worldsheet model describing the propagation of a string in some non-BPS microstates, and show how to compute correlation...
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Josh KirklinPoster
I will describe how topologically non-trivial contributions to the semiclassical gravitational path integral modify the Unruh effect, which is a phenomenon whereby an accelerating observer experiences a thermal state. In particular, I consider topologies in the Schwinger-Keldysh formalism involving wormholes connecting the forward and backward evolving branches. These wormholes may, under...
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