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Cosmic expansion in extended quasidilaton massive gravity
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Number of Authors: 62015 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 91, no 4, article id 041301Article in journal (Refereed) Published
Abstract [en]

Quasidilaton massive gravity offers a physically well-defined gravitational theory with nonzero graviton mass. We present the full set of dynamical equations governing the expansion history of the Universe, valid during radiation domination, matter domination, and a late-time self-accelerating epoch related to the graviton mass. The existence of self-consistent solutions constrains the amplitude of the quasidilaton field and the graviton mass, as well as other model parameters. We point out that the effective mass of gravitational waves can be significantly larger than the graviton mass, opening the possibility that a single theory can explain both the late-time acceleration of cosmic expansion and modifications of structure growth leading to the suppression of large-angle correlations observed in the cosmic microwave background.

Place, publisher, year, edition, pages
2015. Vol. 91, no 4, article id 041301
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Physical Sciences
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URN: urn:nbn:se:su:diva-159600DOI: 10.1103/PhysRevD.91.041301ISI: 000352306000001OAI: oai:DiVA.org:su-159600DiVA, id: diva2:1244842
Available from: 2018-09-03 Created: 2018-09-03 Last updated: 2018-09-03Bibliographically approved

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Kahniashvili, Tina
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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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