Cosmology in general massive gravity theories
- INFN — Sezione di Ferrara, I-35131 Ferrara (Italy)
- Gran Sasso Science Institute, viale Crispi 7, I-67100 L'Aquila (Italy)
We study the cosmological FRW flat solutions generated in general massive gravity theories. Such a model are obtained adding to the Einstein General Relativity action a peculiar non derivative potentials, function of the metric components, that induce the propagation of five gravitational degrees of freedom. This large class of theories includes both the case with a residual Lorentz invariance as well as the case with rotational invariance only. It turns out that the Lorentz-breaking case is selected as the only possibility. Moreover it turns out that that perturbations around strict Minkowski or dS space are strongly coupled. The upshot is that even though dark energy can be simply accounted by massive gravity modifications, its equation of state w{sub eff} has to deviate from -1. Indeed, there is an explicit relation between the strong coupling scale of perturbations and the deviation of w{sub eff} from -1. Taking into account current limits on w{sub eff} and submillimiter tests of the Newton's law as a limit on the possible strong coupling scale, we find that it is still possible to have a weakly coupled theory in a quasi dS background. Future experimental improvements on short distance tests of the Newton's law may be used to tighten the deviation of w{sub eff} form -1 in a weakly coupled massive gravity theory.
- OSTI ID:
- 22373558
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 05; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COSMOLOGY AND ASTRONOMY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGY
DEGREES OF FREEDOM
EQUATIONS OF STATE
GENERAL RELATIVITY THEORY
GRAVITATION
LORENTZ INVARIANCE
MATHEMATICAL SOLUTIONS
MINKOWSKI SPACE
NONLUMINOUS MATTER
PERTURBATION THEORY
ROTATIONAL INVARIANCE
STRONG-COUPLING MODEL