Growth Histories in Bimetric Massive Gravity
2012 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, Vol. 12Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Bristol: IoP Publishing , 2012. Vol. 12
Research subject Physics
IdentifiersURN: urn:nbn:se:kau:diva-26948DOI: 10.1088/1475-7516/2012/12/021ISI: 000312959800021OAI: oai:DiVA.org:kau-26948DiVA: diva2:616218