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Can background cosmology hold the key for modified gravity tests?

Ceron-Hurtado, Juan; He, Jianhua; Li, Baojiu

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Authors

Juan Ceron-Hurtado

Jianhua He



Abstract

Modified gravity theories are a popular alternative to dark energy as a possible explanation for the observed accelerating cosmic expansion, and their cosmological tests are currently an active research field. Studies in recent years have been increasingly focused on testing these theories in the nonlinear regime, which is computationally demanding. Here we show that, under certain circumstances, a whole class of theories can be ruled out by using background cosmology alone. This is possible because certain classes of models (i) are fundamentally incapable of producing specific background expansion histories, and (ii) said histories are incompatible with local gravity tests. As an example, we demonstrate that a popular class of models, f(R) gravity, would not be viable if observations suggest even a slight deviation of the background expansion history from that of the ΛCDM paradigm.

Journal Article Type Article
Acceptance Date Aug 31, 2016
Online Publication Date Sep 19, 2016
Publication Date Sep 19, 2016
Deposit Date Nov 18, 2016
Publicly Available Date Nov 29, 2016
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 94
Issue 6
Article Number 064052
DOI https://doi.org/10.1103/physrevd.94.064052
Public URL https://durham-repository.worktribe.com/output/1400576
Related Public URLs https://arxiv.org/abs/1609.00532

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Copyright Statement
Reprinted with permission from the American Physical Society: Ceron-Hurtado, Juan, He, Jianhua & Li, Baojiu (2016). Can background cosmology hold the key for modified gravity tests? Physical Review D 94(6): 064052 © 2016 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.






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