Understanding Hawking radiation in the framework of open quantum systems

Details Understanding Hawking radiation in the framework of open quantum systems Understanding Hawking radiation in the framework of open quantum systems

2008-06-23

arxiv.org/abs/0806.3602v1

Phys.Rev.D77:024031,2008; Erratum-ibid.D77:029904,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, no figures, Revtex4

Scientific paper

10.1103/PhysRevD.77.024031

We study the Hawking radiation in the framework of open quantum systems by examining the time evolution of a detector (modelled by a two-level atom) interacting with vacuum massless scalar fields. The dynamics of the detector is governed by a master equation obtained by tracing over the field degrees of freedom from the complete system. The nonunitary effects are studied by analyzing the time behavior of a particular observable of the detector, i.e., its admissible state, in the Unruh, Hartle-Hawking, as well as Boulware vacua outside a Schwarzschild black hole. We find that the detector in both the Unruh and Hartle-Hawking vacua would spontaneously excite with a nonvanishing probability the same as what one would obtain if there is thermal radiation at the Hawking temperature from the black hole, thus reproducing the basic results concerning the Hawking effect in the framework of open quantum systems.

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