Gauge/Gravity Duality 2015

Session

Morning session

Apr 16, 2015, 9:00 AM

The Galileo Galilei Institute for Theoretical Physics (GGI)

21. Quantum quenches & holography

Robert Myers

4/16/15, 9:00 AM

We study quantum quenches in a holographic framework, where the quenches involve varying the coupling of a relevant operator in the boundary theory. The time dependence of the new coupling is characterized by a transition time and the observables exhibit a universal scaling behaviour when this timescale becomes the smallest scale in the problem. The same scaling behaviour is found for mass...

23. Holographic entanglement entropy in excited states from 2d CFT

Alice Bernamonti

4/16/15, 9:40 AM

I will consider the entanglement entropy in 2d conformal field theory in a class of excited states produced by the insertion of a heavy local operator. I will discuss the universal contribution from the stress tensor to the single interval entanglement entropy, and conjecture that this dominates the answer in theories with a large central charge and a sparse spectrum of low-dimension...

26. Holographic thermalization and AdS instability

Ben Craps

4/16/15, 10:50 AM

I will discuss recent developments in the study of AdS (in)stability and their relation to holographic thermalization.

27. Black brane steady states

Amos Yarom

4/16/15, 11:20 AM

We follow the evolution of an asymptotically AdS black brane with a fixed temperature gradient at spatial infinity until a steady state is formed. The resulting energy density and energy flux of the steady state in the boundary theory are compared to a conjecture on the behavior of steady states in conformal field theories. Very good agreement is found.

28. Chaos in the matrix model, and formation and evaporation of a black hole

Masanori Hanada

4/16/15, 11:50 AM

We study real-time evolution of a highly stringy regime of the BFSS matrix model by using a numerical method. We demonstrate that several important properties of a black hole, such as the fast scrambling and evaporation, can be seen, just by following classical time evolution of the matrix model.

29. Holographic topological entanglement entropy and ground state degeneracy

Andrei Parnachev

4/16/15, 12:20 PM

Topological entanglement entropy, a measure of the long-ranged entanglement, is related to the degeneracy of the ground state on a higher genus surface. We construct a class of holographic models where such relation is similar to the one exhibited by Chern-Simons theory in a certain large N limit. Both the non-vanishing topological entanglement entropy and the ground state degeneracy in these...