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Scalar instabilities in bimetric gravity: the Vainshtein mechanism and structure formation
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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: 2
2015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 10, 044Article in journal (Refereed) Published
Abstract [en]

We investigate the observational consequences of scalar instabilities in bimetric theory, under the assumption that the Vainshtein mechanism restores general relativity within a certain distance from gravitational sources. We argue that early time instabilities have a negligible impact on observed structures. Assuming that the instabilities affect sub-horizon density fluctuations, we constrain the redshift, z(i), below which instabilities are ruled out. For the minimal beta(1)-model, observational constraints are close to the theoretical expectations of z(i) approximate to 0.5, potentially allowing the model to be ruled in or out with a more detailed study, possibly including secondary cosmic microwave background constraints.

Place, publisher, year, edition, pages
2015. no 10, 044
Keyword [en]
modified gravity, cosmological perturbation theory, power spectrum
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-125030DOI: 10.1088/1475-7516/2015/10/044ISI: 000365804000045OAI: oai:DiVA.org:su-125030DiVA: diva2:891787
Available from: 2016-01-07 Created: 2016-01-07 Last updated: 2016-01-07Bibliographically approved

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