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Vainshtein Screening in Bimetric Cosmology

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arxiv 1912.09449 v2 pith:BQ5RCF5E submitted 2019-12-19 gr-qc astro-ph.COhep-phhep-th

Marvin Lüben , Angnis Schmidt-May , Juri Smirnov This is my paper · ORCID
classification gr-qcastro-ph.COhep-phhep-th
keywords bimetriccosmologyvainshteinbackgroundcosmologicalhubblelocalmeasurements
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We demonstrate that the instabilities in linear cosmological perturbations in bimetric theory are the manifestation of the non-linear Vainshtein mechanism on an FRW background. The spin-2 mass serves as the cosmological Vainshtein scale in this case. This allows us to quantitatively address early universe cosmology. In particular, in a global analysis, we study data from the cosmic microwave background radiation and local measurements of the Hubble flow. We show that bimetric cosmology resolves the discrepancy in the local and early-time measurements of the Hubble scale via an effective phantom dark energy component.

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    Bigravity with a graviton mass near 4e-33 eV reproduces the DESI-hinted evolving dark energy and is claimed to fit combined cosmological data better than LambdaCDM.

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