Strong interactions and exact solutions in non-linear massive gravity

Details Strong interactions and exact solutions in non-linear massive gravity Strong interactions and exact solutions in non-linear massive gravity

2011-04-12

arxiv.org/abs/1104.2143v2

Phys.Rev. D84 (2011) 064033

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, no figures. Version accepted by PRD

Scientific paper

10.1103/PhysRevD.84.064033

We investigate strong coupling effects in a covariant massive gravity model, which is a candidate for a ghost free non-linear completion of Fierz-Pauli. We analyse the conditions to recover general relativity via Vainshtein mechanism in the weak field limit, and find three main cases depending on the choice of parameters. In the first case, the potential is such that all non-linearities disappear and the vDVZ discontinuity cannot be avoided. In the second case, the Vainshtein mechanism allows to recover general relativity within a macroscopic radius from a source. In the last case, the strong coupling of the scalar graviton completely shields the massless graviton, and weakens gravity when approaching the source. In the second part of the paper, we explore new exact vacuum solutions, that asymptote de Sitter or anti de Sitter space depending on the parameter choice. The curvature of the space is proportional to the mass of the graviton, thus providing a cosmological background which may explain the present day acceleration in terms of the graviton mass. Moreover, by expressing the potential for non-linear massive gravity in a convenient form, we also suggest possible connections with a higher dimensional framework.

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