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We study dynamics of Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetimebased on the ghost-free bigravity theory. Assuming the coupling parametersguaranteeing the existence of de Sitter space as well as Minkowski spacetime,we find two stable attractors for spacetime with "twin" dust matter fields: Oneis de Sitter accelerating universe and the other is matter dominated universe.Although a considerable number of initial data leads to de Sitter universe, wealso find matter dominated universe or spacetime with a future singularity forsome initial data. The cosmic no-hair conjecture does not exactly hold, but theaccelerating expansion can be found naturally. The $\Lambda$-CDM model isobtained as an attractor. We also show that the dark matter component in theFriedmann equation, which originates from another twin matter, can be about 5times larger than the baryonic matter, by choosing the appropriate couplingconstants.

Cosmology in ghost-free bigravity theory with twin matter fluids: The origin of "dark matter"