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  • 1509.01247

    Rights statement: © 2015 American Physical Society

    Accepted author manuscript, 194 KB, PDF document

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

  • PhysRevD.92.124051

    Rights statement: © 2015 American Physical Society

    Final published version, 156 KB, PDF document

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

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

Research output: Contribution to journalJournal article

Published
Article number124501
<mark>Journal publication date</mark>22/12/2015
<mark>Journal</mark>Physical Review D
Issue number12
Volume92
Number of pages8
Publication statusPublished
Original languageEnglish

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.

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© 2015 American Physical Society