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Paper detail

Vainshtein Screening in Bimetric Cosmology

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.

preprint2020arXivOpen access
Marvin LübenAngnis Schmidt-MayJuri Smirnov
astro-ph.COhep-phgr-qchep-th
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Marvin LübenAngnis Schmidt-MayJuri Smirnov

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