Gauge/Gravity Duality 2021

Contribution List

1. Hydrodynamisation and entanglement entropy in expanding spacetimes

Wilke Van Der Schee (CERN)

26/07/2021, 13:00

This talk will be about hydrodynamisation in an FRW universe and entanglement entropy in empty 4-dimensional de Sitter spacetime of a non-conformal QFT [1]. I will first briefly describe the set-up and show how a hydrodynamic plasma dilutes and falls out of equilibrium due to expansion towards empty de Sitter spacetime. Interestingly, in the empty setting we can show that extremal surfaces in...

2. D3-brane solitons and black holes

Ronald Rodgers (University of Southampton)

26/07/2021, 13:50

Four dimensional N=4 SYM with gauge group SU(N) admits spherically symmetric, dyonically charged solitons holographically dual to certain probe D3-brane configurations in AdS5 x S5. A peculiar feature of these solitons, that their masses and charges scale linearly with radius, have lead to the suggestion that they may in some sense provide a QFT analogue of extremal black holes. I will...

3. Remarks on Color Confinement

Igor Klebanov (Princeton University)

26/07/2021, 15:00

4. Branes, Islands, and Massive Gravitons

Andreas Karch (UT Austin)

26/07/2021, 15:50

Recent developments have led to a breakthrough in our understanding of the evaporation of black holes in very special systems: gravity in a box, coupled to an external bath. To what extend these considerations apply to generic black holes is a point of debate. In this talk we will demonstrate that one of the main ingredients in these calculations, the appearance of entanglement islands,...

6. TTbar deformed fermionic theories revisited

Junggi Yoon (APCTP)

27/07/2021, 09:00

In this talk, I will discuss the TTbar deformation of fermionic theories. First, I briefly review the TTbar deformation of two-dimensional QFTs. And, I demonstrate the Hamiltonian analysis of the TTbar deformation of free fermion, and I show how this reproduces the deformed spectrum. Then, I explain how negative norm states could appear in the TTbar deformed fermionic theories depending on the...

5. Towards a Classification of Fermionic Rational Conformal Field Theories

Jinbeom Bae (Korea Institute for Advanced Study)

27/07/2021, 09:50

7. The volume of the black hole interior at late times

Gabor Sarosi (CERN)

27/07/2021, 11:00

The volume of the interior of a two-sided eternal black hole classically grows forever. I will show that in JT gravity, summing the non-perturbative contribution of higher topologies leads to a saturation of the volume of the interior at times exponential in the entropy of the black hole. I will explain that this is evidence for the conjecture that the size of the interior is related to the...

8. Complexity and Conformal Transformations

Mario Flory (Jagiellonian University)

27/07/2021, 11:50

In this talk I will (mainly) present my recent work on complexity, especially how conformal transformations in AdS_3/CFT_2 can provide useful information to check holographic complexity proposals, as well as considerations of complexity of conformal transformations on the field theory side.

9. Enstrophy from symmetry and holography

Natalia Pinzani Fokeeva

28/07/2021, 13:30

Enstrophy is an approximately conserved quantity in 2+1 dimensional fluid flows that has dramatic consequences for the phenomenology of turbulence: it implies an inverse energy cascade in 2+1 dimensions.
In this talk, I will illustrate an algorithm to construct an enstrophy current for fluid flows with various degrees of symmetry, including, but not limited to, the well-known case of...

11. Half-wormhole in SYK with one time point

Baur Mukhametzhanov (IAS (Princeton))

28/07/2021, 14:20

10. Thermalization of 2d Quantum Field Theories

Delacrétaz Luca (University of Chicago)

28/07/2021, 15:30

I will show that (1+1)d QFTs typically thermalize more slowly than the expected "Planckian" equilibration time 1/T. This arises due to causality, which imposes strong constraints on the emergence of hydrodynamic sound in low dimensions. Subluminality of sound further allows one to define a thermodynamic analogue of Zamolodchikov's C-function, and constrain the sign of the TT-bar term in the...

12. Holographic Entropy Cone from Marginal Independence

Veronika Hubeny (UC-Davis)

28/07/2021, 16:20

This talk will explain recent puzzling revelations in the ongoing efforts to obtain a useful characterization of entanglement structure of geometric states in a holographic CFT, via the so-called holographic entropy cone (HEC). The relations between subsystem entanglement entropies which delimit this cone are known explicitly for only a rather coarse subdivision of the system (specified by N...