Growth histories in bimetric massive gravity
Journal Article
·
· Journal of Cosmology and Astroparticle Physics
- Department of Physics, Karlstad University, 651 88 Karlstad (Sweden)
- 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, Vol. 2012, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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