Growth histories in bimetric massive gravity

Journal Article · Sat Dec 01 04:00:00 EST 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/12/021· OSTI ID:22279576

Berg, Marcus; Buchberger, Igor ^[1]; Enander, Jonas; Mörtsell, Edvard; Sjörs, Stefan ^[2]

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1. Department of Physics, Karlstad University, 651 88 Karlstad (Sweden)
2. Oskar Klein Center, Stockholm University, Albanova University Center, 106 91 Stockholm (Sweden)

We perform cosmological perturbation theory in Hassan-Rosen bimetric gravity for general homogeneous and isotropic backgrounds. In the de Sitter approximation, we obtain decoupled sets of massless and massive scalar gravitational fluctuations. Matter perturbations then evolve like in Einstein gravity. We perturb the future de Sitter regime by the ratio of matter to dark energy, producing quasi-de Sitter space. In this more general setting the massive and massless fluctuations mix. We argue that in the quasi-de Sitter regime, the growth of structure in bimetric gravity differs from that of Einstein gravity.

• OSTI ID: 22279576
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 12 Vol. 2012; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
APPROXIMATIONS
COSMOLOGICAL MODELS
COSMOLOGY
DE SITTER GROUP
DE SITTER SPACE
FLUCTUATIONS
GENERAL RELATIVITY THEORY
GRAVITATION
NONLUMINOUS MATTER
PERTURBATION THEORY
SCALARS