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Title: Towards a second law for Lovelock theories
Authors: Bhattacharyya, Sayantani
Haehl, Felix M.
Kundu, Nilay
Loganayagam, R.
Rangamani, Mukund
Keywords: Black Holes
Classical Theories of Gravity
Issue Date: Mar-2017
Publisher: Springer Nature
Journal title: Journal of High Energy Physics
Volume: 2017
Thesis number: 65
Abstract: In classical general relativity described by Einstein-Hilbert gravity, black holes behave as thermodynamic objects. In particular, the laws of black hole mechanics can be interpreted as laws of thermodynamics. The first law of black hole mechanics extends to higher derivative theories via the Noether charge construction of Wald. One also expects the statement of the second law, which in Einstein-Hilbert theory owes to Hawking’s area theorem, to extend to higher derivative theories. To argue for this however one needs a notion of entropy for dynamical black holes, which the Noether charge construction does not provide. We propose such an entropy function for the family of Lovelock theories, treating the higher derivative terms as perturbations to the Einstein-Hilbert theory. Working around a dynamical black hole solution, and making no assumptions about the amplitude of departure from equilibrium, we construct a candidate entropy functional valid to all orders in the low energy effective field theory. This entropy functional satisfies a second law, modulo a certain subtle boundary term, which deserves further investigation in non-spherically symmetric situations.
Rights: © The Author(s) 2017
JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0
DOI(Published Version): 10.1007/JHEP03(2017)065
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