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Bimetric gravity is cosmologically viable
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2015 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 748, 37-44 p.Article in journal (Refereed) Published
Abstract [en]

Bimetric theory describes gravitational interactions in the presence of an extra spin-2 field. Previous work has suggested that its cosmological solutions are generically plagued by instabilities. We show that by taking the Planck mass for the second metric, M-f, to be small, these instabilities can be pushed back to unobservably early times. In this limit, the theory approaches general relativity with an effective cosmological constant which is, remarkably, determined by the spin-2 interaction scale. This provides a late-time expansion history which is extremely close to Lambda CDM, but with a technically-natural value for the cosmological constant. We find M-f should be no larger than the electroweak scale in order for cosmological perturbations to be stable by big-bang nucleosynthesis. We further show that in this limit the helicity-0 mode is no longer strongly-coupled at low energy scales. (C) 2015 The Authors. Published by Elsevier B.V.

Place, publisher, year, edition, pages
2015. Vol. 748, 37-44 p.
Keyword [en]
Modified gravity, Massive gravity, Background cosmology, Cosmic acceleration, Dark energy, Bimetric gravity, Bigravity
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-173419DOI: 10.1016/j.physletb.2015.06.062ISI: 000359146200008OAI: diva2:853634

QC 20150914

Available from: 2015-09-14 Created: 2015-09-11 Last updated: 2015-09-14Bibliographically approved

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