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Unified description of screened modified gravity

Brax, P.; Davis, A.-C.; Li, B; Winther, H.A.

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Authors

P. Brax

A.-C. Davis

H.A. Winther



Abstract

We consider modified gravity models driven by a scalar field whose effects are screened in high density regions due to the presence of nonlinearities in its interaction potential and/or its coupling to matter. Our approach covers chameleon, f(R) gravity, dilaton and symmetron models and allows a unified description of all these theories. We find that the dynamics of modified gravity are entirely captured by the time variation of the scalar field mass and its coupling to matter evaluated at the cosmological minimum of its effective potential, where the scalar field has sat since an epoch prior to big bang nucleosynthesis. This new parametrization of modified gravity allows one to reconstruct the potential and coupling to matter and therefore to analyze the full dynamics of the models, from the scale dependent growth of structures at the linear level to nonlinear effects requiring N-body simulations. This procedure is illustrated with explicit examples of reconstruction for chameleon, dilaton, f(R) and symmetron models.

Journal Article Type Article
Publication Date Aug 8, 2012
Deposit Date Mar 27, 2013
Publicly Available Date May 8, 2014
Journal Physical Review D
Print ISSN 1550-7998
Electronic ISSN 1550-2368
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 86
Issue 4
Article Number 044015
DOI https://doi.org/10.1103/physrevd.86.044015
Public URL https://durham-repository.worktribe.com/output/1490089

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Copyright Statement
Reprinted with permission from the American Physical Society: Brax, P. and Davis, A.-C. and Li, B and Winther, H. A., Physical review D, 86 (4). p. 044015, 2012. © 2012 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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