Barreira, A. and Brax, P. and Cless, S. and Li, B. and Valageas, P. (2015) 'K-mouflage gravity models that pass Solar System and cosmological constraints.', Physical review D., 91 (12). p. 123522.
We show that Solar System tests can place very strong constraints on K-mouflage models of gravity, which are coupled scalar field models with nontrivial kinetic terms that screen the fifth force in regions of large gravitational acceleration. In particular, the bounds on the anomalous perihelion of the Moon imposes stringent restrictions on the K-mouflage Lagrangian density, which can be met when the contributions of higher-order operators in the static regime are sufficiently small. The bound on the rate of change of the gravitational strength in the Solar System constrains the coupling strength β to be smaller than 0.1. These two bounds impose tighter constraints than the results from the Cassini satellite and big bang nucleosynthesis. Despite the Solar System restrictions, we show that it is possible to construct viable models with interesting cosmological predictions. In particular, relative to ΛCDM, such models predict percent-level deviations for the clustering of matter and the number density of dark matter haloes. This makes these models predictive and testable by forthcoming observational missions.
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|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevD.91.123522|
|Publisher statement:||Reprinted with permission from the American Physical Society: Physical Review D 91, 123522 © 2015 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:||No date available|
|Date deposited:||04 September 2015|
|Date of first online publication:||June 2015|
|Date first made open access:||No date available|
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