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Revisiting perturbations in extended quasidilaton massive gravity
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.
2015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, Vol. 2015, no 4, 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. Vol. 2015, no 4, 010
Keyword [en]
Cosmological perturbation theory, Gravity, Modified gravity
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-166981DOI: 10.1088/1475-7516/2015/04/010ISI: 000355742500011ScopusID: 2-s2.0-84927564311OAI: diva2:814750

QC 20150528

Available from: 2015-05-28 Created: 2015-05-21 Last updated: 2015-06-25Bibliographically approved

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Heisenberg, Lavinia
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