Complex Paths and Covariance of Hawking Radiation in 2D Stringy Black Holes

Abstract

Hawking radiation is computed in different coordinate systems using the method of complex paths. In this procedure the event horizon of the 2D Schwarzschild stringy black hole is treated as a singularity for the semiclassical action functional. After the regularization of the event horizon's singularity the emission/absorption probabilities and the Hawking temperature in the different coordinate representations are derived. The identical results obtained indicate the covariance of the Hawking radiation.

LaTeX, 12 pages, no figures, v2: minor typos corrected and references added, v3: version to appear in Nuovo Cim. B