Anomalies, Horizons and Hawking radiation

TL;DR

This paper derives Hawking radiation from specific black holes using a novel approach based solely on chiral anomaly and covariant boundary conditions at the event horizon, avoiding traditional anomaly cancellation methods.

Contribution

It introduces a new method to obtain Hawking radiation relying only on chiral anomaly and boundary conditions, applicable to a broad class of spherically symmetric black holes.

Findings

Hawking radiation is derived for Reissner-Nordström black holes with monopoles.

Hawking radiation is derived for Garfinkle-Horowitz-Strominger black holes.

The method simplifies the derivation by avoiding anomaly cancellation techniques.

Abstract

Hawking radiation is obtained from the Reissner-Nordstr\"{o}m blackhole with a global monopole and the Garfinkle-Horowitz-Strominger blackhole falling in the class of the most general spherically symmetric blackholes $(\sqrt{-g}\neq1)$, using only chiral anomaly near the event horizon and covariant boundary condition at the event horizon. The approach differs from the anomaly cancellation approach since apart from the covariant boundary condition, the chiral anomaly near the horizon is the only input to derive the Hawking flux.