Constraints on bimetric gravity. Part I. Analytical constraints

Abstract Ghost-free bimetric gravity is an extension of general relativity, featuring a massive spin-2 field coupled to gravity. We parameterize the theory with a set of observables having specific physical interpretations. For the background cosmology and the static, spherically symmetric solutions...

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Published inJournal of cosmology and astroparticle physics Vol. 2021; no. 5; pp. 1 - 36
Main Authors Högås, Marcus, Mörtsell, Edvard
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.05.2021
Subjects
Astronomical models
Cosmological constant
Cosmology
dark energy theory
Gravity
modified gravity
Parameters
Relativity
Theory of relativity
Universe
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Summary:Abstract Ghost-free bimetric gravity is an extension of general relativity, featuring a massive spin-2 field coupled to gravity. We parameterize the theory with a set of observables having specific physical interpretations. For the background cosmology and the static, spherically symmetric solutions (for example approximating the gravitational potential of the solar system), there are four directions in the parameter space in which general relativity is approached. Requiring that there is a working screening mechanism and a nonsingular evolution of the Universe, we place analytical constraints on the parameter space which rule out many of the models studied in the literature. Cosmological solutions where the accelerated expansion of the Universe is explained by the dynamical interaction of the massive spin-2 field rather than by a cosmological constant, are still viable.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2021/05/001