Nonlocal gravity in D-dimensions:propagators, entropy, and bouncing cosmology

Conroy, Aindriu and Mazumdar, Anupam and Talaganis, Spyridon and Teimouri, Ilia (2015) Nonlocal gravity in D-dimensions:propagators, entropy, and bouncing cosmology. Physical Review D, 92 (12). ISSN 1550-7998

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Abstract

We present the graviton propagator for an infinite derivative, D-dimensional, nonlocal action, up to quadratic order in curvature around a Minkowski background, and discuss the conditions required for this class of gravity theory to be ghost-free. We then study the gravitational entropy for de-Sitter and anti-de Sitter backgrounds, before comparing with a recently derived result for a Schwarzschild black hole, generalized to arbitrary D dimensions, whereby the entropy is given simply by the area law. A novel approach of decomposing the entropy into its (r,t) and spherical components is adopted in order to illustrate the differences more clearly. We conclude with a discussion of de-Sitter entropy in the framework of a nonsingular bouncing cosmology.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
© 2015 American Physical Society
Subjects:
ID Code:
78333
Deposited By:
Deposited On:
22 Apr 2016 14:32
Refereed?:
Yes
Published?:
Published
Last Modified:
26 May 2020 04:39