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Cosmological histories in bimetric gravity: a graphical approach
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 1
2017 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 2, 051Article in journal (Refereed) Published
Abstract [en]

The bimetric generalization of general relativity has been proven to be able to give an accelerated background expansion consistent with observations. Apart from the energy densities coupling to one or both of the metrics, the expansion will depend on the cosmological constant contribution to each of them, as well as the three parameters describing the interaction between the two metrics. Even for fixed values of these parameters can several possible solutions, so called branches, exist. Different branches can give similar background expansion histories for the observable metric, but may have different properties regarding, for example, the existence of ghosts and the rate of structure growth. In this paper, we outline a method to find viable solution branches for arbitrary parameter values. We show how possible expansion histories in bimetric gravity can be inferred qualitatively, by picturing the ratio of the scale factors of the two metrics as the spatial coordinate of a particle rolling along a frictionless track. A particularly interesting example discussed is a specific set of parameter values, where a cosmological dark matter background is mimicked without introducing ghost modes into the theory.

Place, publisher, year, edition, pages
2017. no 2, 051
Keyword [en]
modified gravity, dark energy theory, dark matter theory
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-143509DOI: 10.1088/1475-7516/2017/02/051ISI: 000399455000051OAI: oai:DiVA.org:su-143509DiVA: diva2:1099090
Available from: 2017-05-29 Created: 2017-05-29 Last updated: 2017-11-29Bibliographically approved

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Mörtsell, Edvard
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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