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2015

Cosmology of bigravity with doubly coupled matter

Comelli, Denis, Crisostomi, Marco, Koyama, Kazuya et al.

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We study cosmology in the bigravity formulation of the dRGT model where matter couples to both metrics.

At linear order in perturbation theory two mass scales emerge: an hard one from the dRGT potential, and an environmental dependent one from the coupling of bigravity with matter.
At early time, the dynamics is dictated by the second mass scale which is of order of the Hubble scale.
The set of gauge invariant perturbations that couples to matter follow closely the same behaviour as in GR.

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