Hawking Radiation, Covariant Boundary Conditions and Vacuum States
arXiv:0810.5683 · doi:10.1103/PhysRevD.79.084035
Abstract
The basic characteristics of the covariant chiral current $<J_μ>$ and the covariant chiral energy-momentum tensor $<T_{μν}>$ are obtained from a chiral effective action. These results are used to justify the covariant boundary condition used in recent approaches \cite{Isowilczek,Isoumtwilczek,shailesh,shailesh2,Banerjee} of computing the Hawking flux from chiral gauge and gravitational anomalies. We also discuss a connection of our results with the conventional calculation of nonchiral currents and stress tensors in different (Unruh, Hartle-Hawking and Boulware) states.
18 pages, no figures, minor changes, to appear in Phys. Rev. D