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

Edholm, James (2018) Revealing infinite derivative gravity's true potential:The weak-field limit around de Sitter backgrounds. Physical Review D, 97 (6). ISSN 1550-7998

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
© 2018 American Physical Society
ID Code:
123860
Deposited By:
Deposited On:
05 Mar 2018 13:46
Refereed?:
Yes
Published?:
Published
Last Modified:
05 Dec 2020 04:41