New massive bigravity cosmologies with double matter coupling

Macarena Lagos, Johannes Noller

Research output: Contribution to journalArticlepeer-review


We study a previously largely unexplored branch of homogeneous and isotropic background solutions in ghost-free massive bigravity with consistent double matter coupling. For a certain family of parameters we find `self-inflated' FLRW cosmologies, i.e. solutions with an accelerated early-time period during the radiation-dominated era. In addition, these solutions also display an accelerated late-time period closely mimicking GR with a cosmological constant. Interestingly, within this family, the particular case of β13=0 gives bouncing cosmologies, where there is an infinite contracting past, a non-zero minimum value of the scale factor at the bounce, and an infinite expanding future.
Original languageEnglish
Article number023
Pages (from-to)1-31
Number of pages31
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
Publication statusPublished - 14 Jan 2016


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