Strongly Coupled Radiation from Moving Mirrors and Holography in the Karch-Randall model

TL;DR

This paper investigates particle creation by accelerating mirrors modeled as gravitating domain walls in AdS space, comparing weak and strong coupling effects, and providing insights into holography and black hole evaporation.

Contribution

It offers an exact solution for particle production including backreaction at strong coupling in the Karch-Randall holographic model, linking boundary conditions to CFT radiation.

Findings

CFT radiation is not suppressed at strong coupling.

Boundary conditions in AdS_5 match CFT boundary conditions at leading order.

Relativistic cosmic strings in AdS are repulsive and produce tidal forces.

Abstract

Motivated by the puzzles in understanding how Black Holes evaporate into a strongly coupled Conformal Field Theory, we study particle creation by an accelerating mirror. We model the mirror as a gravitating Domain Wall and consider a CFT coupled to it through gravity, in asymptotically Anti de Sitter space. This problem (backreaction included) can be solved exactly at one loop. At strong coupling, this is dual to a Domain Wall localized on the brane in the Karch-Randall model, which can be fully solved as well. Hence, in this case one can see how the particle production is affected by A) strong coupling and B) its own backreaction. We find that A) the amount of CFT radiation at strong coupling is not suppressed relative to the weak coupling result; and B) once the boundary conditions in the AdS_5 bulk are appropriately mapped to the conditions for the CFT on the boundary of AdS_4, the Karch-Randall model and the CFT side agree to leading order in the backreaction. This agreement holds even for a new class of self-consistent solutions (the `Bootstrap' Domain Wall spacetimes) that have no classical limit. This provides a quite precise check of the holographic interpretation of the Karch-Randall model. We also comment on the massive gravity interpretation. As a byproduct, we show that relativistic Cosmic Strings (pure tension codimension 2 branes) in Anti de Sitter are repulsive and generate long-range tidal forces even at classical level. This is the phenomenon dual to particle production by Domain Walls.