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Can background cosmology hold the key for modified gravity tests?

Ceron-Hurtado, Juan and He, Jianhua and Li, Baojiu (2016) 'Can background cosmology hold the key for modified gravity tests?', Physical review D., 94 (6). 064052 .


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.

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Publisher 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.
Date accepted:31 August 2016
Date deposited:29 November 2016
Date of first online publication:19 September 2016
Date first made open access:29 November 2016

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