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arxiv: 1212.2079 · v4 · pith:Y3HUW6DJnew · submitted 2012-12-10 · ✦ hep-th · astro-ph.CO· gr-qc

Variety of cosmic acceleration models from massive F(R) bigravity

classification ✦ hep-th astro-ph.COgr-qc
keywords metricconsistentsolutionalwaysbigravitycoincidecosmologicaldecelerating
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We study the accelerating cosmology in massive $F(R)$ bigravity via the reconstruction scheme. The consistent solution of the FRW equations is presented: it includes Big and Little Rip, quintessence, de Sitter and decelerating universes described by the physical $g$ metric while the corresponding solution of the universe described by the reference $f$ metric is also found. It is demonstrated that in general the cosmological singularities of $g$ metric are not always manifested as cosmological singularities of the reference $f$ metric. We give two consistent ways to describe the Big and Little Rip, quintessence, de Sitter and decelerating universes. In one of the consistent solutions, the two metrics $g$ and $f$ coincide with each other, which may indicate the connection with the convenient single metric background formulation. For another solution, where two metrics $g$ and $f$ do not coincide with each other, here always appears super-luminal mode.

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