Why there is no information loss Speaker(s): Abhay Ashtekar
Abstract: Using 2dimensional CGHS black holes, I will argue that information is not lost in the Hawking evaporation because the quantum spacetime is significantly larger than the classical one. I will begin with a discussion of the conceptual underpinnings of problem and then introduce a general, nonperturbative framework to describe quantum CGHS black holes. I will show that the Hawking effect emerges from it in the first approximation. Finally, I will introduce a mean field approximation to argue that, when the back reaction is included, future null infinity is `long enough' to capture full information contained in pure states at past null infinity and that the Smatrix is unitary. There are no macroscopic remnants.
Date: 04/12/2008  11:00 am
Series: Quantum Gravity
