K-mouflage gravity models that pass Solar System and cosmological constraints

Barreira, A.; Brax, P.; Cless, S.; Li, B.; Valageas, P.

Abstract

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.

Citation

Barreira, A., Brax, P., Cless, S., Li, B., & Valageas, P. (2015). K-mouflage gravity models that pass Solar System and cosmological constraints. Physical Review D, 91(12), Article 123522. https://doi.org/10.1103/physrevd.91.123522

• Journal Article Type: Article
• Publication Date: Jun 15, 2015
• Deposit Date: Aug 17, 2015
• Publicly Available Date: Sep 4, 2015
• Journal: Physical Review D - Particles, Fields, Gravitation, and Cosmology
• Print ISSN: 1550-7998
• Electronic ISSN: 1550-2368
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 91
• Issue: 12
• Article Number: 123522
• DOI: https://doi.org/10.1103/physrevd.91.123522
• Public URL: https://durham-repository.worktribe.com/output/1433657
• Related Public URLs: http://arxiv.org/abs/1504.01493