Evaporation of large black holes in AdS: coupling to the evaporon

TL;DR

This paper introduces a model coupling a bulk scalar field to an external 'evaporon' to simulate black hole evaporation in AdS, addressing the information paradox by allowing partial boundary absorption and energy transfer.

Contribution

It proposes a simple, tractable model that modifies boundary conditions in AdS to enable black hole evaporation within the holographic framework.

Findings

Computed transmission coefficient in the planar limit

Demonstrated energy transfer from black hole to external sector

Showed partial boundary absorption facilitates evaporation

Abstract

Large black holes in an asymptotically AdS spacetime have a dual description in terms of approximately thermal states in the boundary CFT. The reflecting boundary conditions of AdS prevent such black holes from evaporating completely. On the other hand, the formulation of the information paradox becomes more stringent when a black hole is allowed to evaporate. In order to address the information loss problem from the AdS/CFT perspective we then need the boundary to become partially absorptive. We present a simple model that produces the necessary changes on the boundary by coupling a bulk scalar field to the evaporon, an external field propagating in one extra spatial dimension. The interaction is localized at the boundary of AdS and leads to partial transmission into the additional space. The transmission coefficient is computed in the planar limit and perturbatively in the coupling constant. Evaporation of the large black hole corresponds to cooling down the CFT by transferring energy to an external sector.