Focus Week on Quantum Gravity and Holography

Contribution List

26. welcome address

02/04/2018, 09:55

1. Constraints on Quantum Gravity (Hirosi Ooguri, Caltech, Kavli IPMU)

02/04/2018, 10:00

2. JT-bar deformed CFTs and their holographic interpretation (Monica Guica, IPhT/CEA Saclay /Uppsala)

02/04/2018, 11:15

It has been recently shown that the deformation of an arbitrary two-dimensional conformal field theory by the composite irrelevant operator
TT-bar, built from the components of the stress tensor, is solvable; in particular, the finite-size spectrum of the deformed theory can be obtained from that of the original CFT through a universal formula. We study a similarly universal, Lorentz-breaking...

3. Exact Bulk Operators and the Fate of Locality (Jared Kaplan, Johns Hopkins)

02/04/2018, 13:45

Abstract: We recently used Virasoro symmetry considerations to propose an exact formula for a bulk proto-field φ in AdS3. In this talk we will explain the construction and study the propagator <φφ>. Many techniques from the study of conformal blocks can be generalized to compute it, and when the results are expanded at large central charge, they match gravitational perturbation theory for a...

4. Eternal traversable wormhole in two dimensions (Xiaoliang Qi, Stanford U)

03/04/2018, 10:00

We study two Sachdev-Ye-Kitaev models with a relevant coupling, and show that a subsector of this theory is dual to a gravity in nearly AdS2 geometry, with two causally connected boundaries. The coupling corresponds to matter with negative null energy in gravity theory. We study the ground state and finite temperature properties of this model. There is an interesting phase transition at finite...

5. Non-perturbative QFT methods inspired by holography (Emanuel Katz, Boston Univ.)

03/04/2018, 11:15

I will describe a new numerical approach for calculating dynamical quantities in QFT in the non-perturbative regime.

In this approach any QFT (including a gauge theory) can be formulated as a relevant perturbation of a UV CFT.

The states of the CFT are used as a basis to describe the resulting RG-flow. Holography motivates a certain truncation
of the CFT basis which allows for numerical...

6. A Critique of the Fuzzball Program (Suvrat Raju, ICTS)

03/04/2018, 13:45

We explore the viability of fuzzballs as candidate microstate geometries for the black hole, and their possible role in resolutions of the information paradox. We argue that if fuzzballs provide a description of black-hole microstates, then the typical fuzzball microstate can only differ significantly from the conventional black-hole geometry at a Planck-scale-distance from the horizon....

7. Scattering Forms from Geometries at Infinity (Song He, ITP Chinese Academy of Science)

04/04/2018, 10:00

Abstract: Scattering amplitudes play a prominent role not only in high
energy particle physics, but also for quantum gravity in
asymptotically flat spacetime.The search for a "theory at infinity” of
the S-Matrix has revealed surprising geometric structures underlying
amplitudes ranging from the string worldsheet to the amplituhedron,
but these are all geometries in auxiliary spaces as opposed...

8. Holography for General Spacetimes (Yasunori Nomura, UC Berkeley)

04/04/2018, 11:15

9. Gravity and interacting O(N) model quantum mechanics (Bo Sundborg, Stockholm Univ.)

04/04/2018, 13:45

I wish to apply quantum field theory (and quantum mechanics) to define a quantum gravity theory in a simple case. AdS/CFT and gauge/gravity correspondences suggest calculating bulk quantities by boundary methods, by-passing bulk action principles. Interacting O(N) model quantum mechanics is a simple relative to higher dimensional boundary theories dual to gravity with broken higher spin...

10. Nonrelativistic Naturalness and Gravity (Petr Horava, UC Berkeley)

05/04/2018, 10:00

12. Black holes from singlet models (Nico Wintergerst, Niels Bohr Institute, Univ. of Copenhagen)

05/04/2018, 11:15

Thermal boundary correlation functions provide a direct and accessible way to probe features of an emergent bulk geometry. In free large N gauge theories dual to higher spin gravity and tensionless string theory, two point correlators of singlet operators encode propagation through an approximate AdS spacetime at low temperatures. Contrarily, in high temperature phases, we discover...

11. Quantum Information and Topological Complexity in AdS/CFT (Rene Meyer, ITP Wuerzburg)

05/04/2018, 13:15

Recently, using the AdS/CFT correspondence exciting new relations are
being established between aspects of quantum information theory and of
the geometry of black holes in Anti de Sitter space-times. After a
concise review of the roles of entanglement measures such as e.g. the
entanglement entropy as well as of the computational complexity within
the AdS/CFT correspondence, I discuss the...

15. Bulk reconstruction of the black holes in AdS/CFT correspondence (Kanato Goto, UTokyo)

05/04/2018, 13:45

In the context of AdS/CFT, one of the most important problem is to
understand how CFTs describe the bulk interior of the AdS spacetime.
Especially, it is not clear whether CFTs can describe the black hole
interior. In order to understand it, we construct the bulk local
states which are dual to the the states locally excited by a scalar
fields in the AdS black holes. For double-sided BHs dual...

14. Warped Black Holes in Lower Spin Gravity (Max Riegler, Université libre de Bruxelles)

05/04/2018, 14:30

In this talk I present a novel and very efficient description of
spacelike warped Anti-de Sitter black holes in terms of a lower spin
Chern-Simons theory that allows for various interesting extensions. A
special focus will be on how to determine the thermal entropy as well
as entanglement entropy holographically in this formulation. The
validity of the results obtained in the Chern-Simons...

16. Correlators in higher spin AdS_3 holography with loop corrections (Takahiro Uetoko, Ritsumeikan Univ., Japan)

05/04/2018, 15:00

We study the correlators of 2d W_N minimal models and quantum effects
in the dual gravity theory. From boundary viewpoint, we develop a new
method to compute three point functions with two scalar operators and
a higher spin current and obtain new results at the next non-trivial
order in 1/N expansion [arXiv : 1708.02017]. From bulk viewpoint, we
propose new regularization prescription with the...

20. Big-J in 3D and O(4) (Masataka Watanabe, Kavli IPMU)

05/04/2018, 16:00

I will discuss conformal O(4) model at large global charges. Unlike
the case in the O(2) model, the ground state configuration is
inhomogeneous and its 2-point function exhibits an interesting
behaviour.

17. The String Worldsheet as one Candidate Dual Description of SYK Model (Yun-Long Zhang, APCTP, China)

05/04/2018, 16:30

Recent studies of the fluctuations of an open string in AdS space show
some pieces of evidence that the string with a worldsheet horizon
could be a dual description of SYK model, as they saturate universal
chaos bound and share the same symmetry. An open string hangs from the
AdS boundary to the horizon of black brane could be dual to a 0+1
dimensional boundary state. To be specific, we find...

18. Weak Gravity Conjecture, Multiple Point Principle and the Standard Model Landscape (Yuta Hamada, Univ. of Wisconsin-Madison)

06/04/2018, 10:00

The requirement for an ultraviolet completable theory to be well-behaved upon compactification has been suggested as a guiding principle for distinguishing the landscape from the swampland. Motivated by the weak gravity conjecture and the multiple point principle, we investigate the vacuum structure of the standard model compactified on S1 and T2. The measured value of the Higgs mass implies,...

19. Simeon Hellerman

06/04/2018, 11:15

22. N=2* Super Yang-Mills on a Lattice (Anosh Joseph, ICTS, Tata Institute)

06/04/2018, 13:30

Four-dimensional N=2 super Yang-Mills theory is obtained by introducing a one parameter
mass deformation to the hypermultiplet of four-dimensional N=4 Yang-Mills.
Four-dimensional N=2 Yang-Mills is a non-conformal gauge theory and its gravitational
dual has been constructed by Pilch and Warner. The theory exhibits many interesting
properties at finite temperature. We formulate N=2* super...

23. Spherical transverse M5-branes from the plane wave matrix model (Goro Ishiki, Tsukuba)

06/04/2018, 14:10

We consider the matrix theoretical description of transverse M5-branes
in M-theory on the 11-dimensional maximally supersymmetric pp-wave
background. We apply the　localization to the plane wave matrix model
(PWMM) and show that transverse spherical fivebranes emerge as the
distribution of low energy moduli of the scalar fields in PWMM.

24. Phase transitions in the BMN matrix model (Yuhma Asano, Dublin Institute for Advanced)

06/04/2018, 14:40

An idea to formulate string theory or M-theory by a gauge theory
attracts theorists and has been extensively studied. The gauge theory
should be lower dimensional so that a geometry in string or M-theory,
which has higher dimensions, must emerge from it. This suggests that
there should be a phase transition in the gauge theory and that the
geometry would appear as its temperature decreases. In...

25. Complex Langevin dynamics and large-N gauge theories (Pallab Basu, ICTS)

Using complex Langevin dynamics and stochastic quantization we examine the phase structure of a large N unitary matrix model at low temperature with finite quark chemical potential. This model is obtained as the low temperature effective theory of QCD with N number of colors and N_f number of quark flavors. We simulate several observables of the model, including Polyakov lines and quark number...

21. Superstring worldsheet beyond perturbation theory (Valentina Forini, Humboldt Univ.)

String sigma-models relevant in AdS/CFT are highly non-trivial two-dimensional field theories for which predictions at finite coupling assume integrability and/or the duality itself. Adopting the perspective of genuine quantum field theory methods, I will briefly review the perturbative analysis and discuss progress on how to extract non-perturbative information for the Green-Schwarz...

13. Tatsuo Azeyanagi