Key points are not available for this paper at this time.
Black holes are shown to obey the principles of irreversible thermodynamics in the form of a fluctuation-dissipation theorem for their zero-point quantum fluctuations. Moreover Hawking radiation is shown to be related to the macroscopic radiation of a nonstationary black hole in accordance with Onsager's principle.
Candelas et al. (Mon,) studied this question.