Entropy Production and Semiclassical Gravity

Details Entropy Production and Semiclassical Gravity Entropy Production and Semiclassical Gravity

2012-03-22

arxiv.org/abs/1203.5119v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 Pages, 2 figures, invited article for SIGMA special issue on Loop Quantum Gravity and Cosmology

Scientific paper

In this article we explore the origin of black hole thermodynamics using semiclassical states in loop quantum gravity. We re-examine the case of entropy using a density matrix for a coherent state and describe correlations across the horizon due to SU(2) intertwiners. We further show that Hawking radiation is a consequence of a non-Hermitian term in the evolution operator, which is necessary for entropy production or depletion at the horizon. This non-unitary evolution is also rooted in formulations of irreversible physics.

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