1203.5119 (Arundhati Dasgupta)

Entropy Production and Semiclassical Gravity    [PDF]

Arundhati Dasgupta

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.

View original: http://arxiv.org/abs/1203.5119