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Revisiting perturbations in extended quasidilaton massive gravity
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).
Number of Authors: 12015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 4, article id 010Article in journal (Refereed) Published
Abstract [en]

In this work we study the theory of extended quasidilaton massive gravity together with the presence of matter fields. After discussing the homogeneous and isotropic fully dynamical background equations, which governs the exact expansion history of the universe, we consider small cosmological perturbations around these general FLRW solutions. The stability of tensor, vector and scalar perturbations on top of these general background solutions give rise to slightly different constraints on the parameters of the theory than those obtained in the approximative assumption of the late-time asymptotic form of the expansion history, which does not correspond to our current epoch. This opens up the possibility of stable FLRW solutions to be compared with current data on cosmic expansion with the restricted parameter space based on theoretical ground.

Place, publisher, year, edition, pages
2015. no 4, article id 010
Keywords [en]
gravity, modified gravity, cosmological perturbation theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-159592DOI: 10.1088/1475-7516/2015/04/010ISI: 000355742500011OAI: oai:DiVA.org:su-159592DiVA, id: diva2:1245099
Available from: 2018-09-04 Created: 2018-09-04 Last updated: 2018-09-04Bibliographically approved

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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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Journal of Cosmology and Astroparticle Physics
Physical Sciences

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