Events Daily

Tuesday, November 15, 2022

ASTRO Journal Club
Event Type: Other
Time: 12:30 PM - 1:30 PM
Location: 726 Broadway, 940, CCPP Seminar

The Value of High Resolution Studies of the Nearest Galaxies
Julianne Dalcanton, Flatiron Institute
Event Type: Astro Seminar
Time: 2:00 PM - 3:00 PM
Location: 726 Broadway, 940, CCPP Seminar

Link to the Event Video

A Microscopic Model of Black Hole Evaporation in 2-dim.
Spenta Wadia, ICTS
Event Type: Special Seminar
Time: 4:00 PM - 5:00 PM
Location: 726 Broadway, 940, CCPP Seminar
Abstract: We present a microscopic model of black hole ‘evaporation’ in asymptotically AdS_2 spacetimes dual to the low energy sector of the SYK model. To describe evaporation, the SYK model is coupled to a bath consisting of free scalar fields using the Kourkoulou-Maldacena (KM) type operators in the Schwinger-Keldysh formalism. We discuss the time evolution of a product of a pure state of the SYK system, namely a black hole microstate, and a Calabrese-Cardy state of the bath. Tracing over the bath degrees of freedom leads to a Feynman-Vernon type effective action for the SYK model, which we study in the large N and low energy limit. The leading large N behaviour of the time reparameterization mode is found. The subleading fluctuations are characterized by a non-Markovian non-linear stochastic differential equation (SDE) with non-local Gaussian noise. At large times we find two classes of solutions which approach a black hole at a lower temperature or a horizonless geometry. By repeating the dynamical process o(N^2) times with different choices of the KM operators one can in principle reconstruct the initial black hole microstate.