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Bimetric gravity is cosmologically viable
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ruprecht-Karls-Universität Heidelberg, Germany.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ruprecht-Karls-Universität Heidelberg, Germany.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Eidgenössische Technische Hochschule Zürich, Germany.
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Number of Authors: 5
2015 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, 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.

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
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-120887DOI: 10.1016/j.physletb.2015.06.062ISI: 000359146200008OAI: oai:DiVA.org:su-120887DiVA: diva2:945044
Available from: 2016-06-30 Created: 2015-09-18 Last updated: 2016-06-30Bibliographically approved

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Schmidt-May, Angnis
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Nordic Institute for Theoretical Physics (Nordita)Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Physics Letters B
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