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  • IDGPotentialaroundexpandingbackgroundPRL

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Revealing infinite derivative gravity's true potential: The weak-field limit around de Sitter backgrounds

Research output: Contribution to journalJournal article

Published
Article number064011
<mark>Journal publication date</mark>15/03/2018
<mark>Journal</mark>Physical Review D
Issue number6
Volume97
Number of pages6
Publication statusPublished
Early online date14/03/18
Original languageEnglish

Abstract

General Relativity is known to produce singularities in the potential generated by a point source. Our universe can be modelled as a de Sitter (dS) metric and we show that ghost-free Infinite Derivative Gravity (IDG) produces a non-singular potential around a dS background, while returning to the GR prediction at large distances. We also show that although there are an apparently infinite number of coefficients in the theory, only a finite number actually affect the predictions.
By writing the linearised equations of motion in a simplified form, we find that at distances below the Hubble length scale, the difference between the IDG potential around a flat background and around a de Sitter background is negligible.

Bibliographic note

© 2018 American Physical Society