Unified description of screened modified gravity.

By P. Brax, A. Davis, Baojiu Li, H. Winther. 2012

158 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/87e4a74566fc7026b2ac42470ec42bf03c1c4ca4

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Citations in the corpus

ASTROPHYSICAL TESTS OF MODIFIED GRAVITY: CONSTRAINTS FROM DISTANCE INDICATORS IN THE NEARBY UNIVERSE (2012, methodology): “Recently, a new unified parameterization has been discovered (Brax et al. 2012a, 2012b) where theories with screening mechanisms can be reverse engineered by specifying a functional form of the cosmological mass and coupling in terms of the scale factor.”
Hybrid Metric-Palatini Gravity (2015, background): “It is well known, however, that light scalars do have an impact at shorter scales, where their presence is strongly constrained by laboratory and Solar System observations unless some kind of screening mechanism is invoked [19–23].”