Hawking Radiation, Effective Actions and Covariant Boundary Conditions

TL;DR

This paper derives Hawking radiation for charged black holes using covariant boundary conditions and effective actions, linking it to the Unruh vacuum and anomaly-based methods.

Contribution

It introduces a novel derivation of Hawking radiation employing covariant boundary conditions and effective actions, connecting with existing anomaly approaches.

Findings

Hawking radiation derived from effective actions with covariant boundary conditions.

Established connection between covariant boundary condition approach and anomaly analysis.

Linked the approach to the Unruh vacuum and recent anomaly-based studies.

Abstract

From appropriate expressions for effective actions, the Hawking radiation from charged black holes is derived, using only covariant boundary conditions at the event horizon. The connection of our approach with the Unruh vacuum and the recent analysis \cite{Robwilczek,Isowilczek,shailesh} of Hawking radiation using anomalies is established.