Thermalization of Two Point Functions in the AdS/CFT Duality

Ville Keranen (Oxford)

In the AdS/CFT duality, certain types of quantum quenches in the boundary theory are dual to spacetimes where a black hole forms through collapse.
In this talk we will explain this connection by reviewing an analytically tractable example of this process. Then we move on to compute two point functions in such a collapsing spacetime. The two point functions are found to relax to thermal equilibrium with a rate set by the lowest quasinormal mode of the corresponding field. We will try to explain why this happens.
Finally we define an effective occupation number, motivated by the fluctuation dissipation relation in thermal equilibrium, and study how that thermalizes in this system.