Covariant Anomalies, Horizons and Hawking Radiation

Abstract

Hawking radiation is obtained from anomalies resulting from a breaking of diffeomorphism symmetry near the event horizon of a black hole. Such anomalies, manifested as a nonconservation of the energy momentum tensor, occur in two different forms -- covariant and consistent. The crucial role of covariant anomalies near the horizon is revealed since this is the {\it only} input required to obtain the Hawking flux, thereby highlighting the universality of this effect. A brief description to apply this method to obtain thermodynamic entities like entropy or temperature is provided.

5 pages; This essay was awarded an Honorable Mention in the 2008 Gravity Research Foundation essay competition

References in corpus (3)

• Hawking Radiation from Charged Black Holes via Gauge and Gravitational Anomalies
• Hawking Radiation and Covariant Anomalies
• Hawking Radiation, Effective Actions and Covariant Boundary Conditions

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• Hawking Radiation of Fermionic Field and Anomaly in 2+1 Dimensional Black Holes