Change search
ReferencesLink to record
Permanent link

Direct link
Linear growth of structure in massive bigravity
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.ORCID iD: 0000-0002-9403-8565
2014 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, Vol. 2014, no 10, 066- p.Article in journal (Refereed) Published
Abstract [en]

The ghost-free theory of massive gravity with two dynamical metrics has been shown to produce viable cosmological expansion, where the late-time acceleration of the Universe is due to the finite range of the gravitational interaction rather than a nonzero cosmological constant. Here the cosmological perturbations are studied in this theory. The full perturbation equations are presented in a general gauge and analyzed, focusing on subhorizon scales in the quasistatic limit during the matter-dominated era. An evolution equation for the matter inhomogeneities and the parameters quantifying the deviations from general relativistic structure formation are expressed in terms of five functions whose forms are determined directly by the coupling parameters in the theory. The evolution equation has a similar structure to Horndeski-type scalar-tensor theories, exhibiting a modified growth rate and scale-dependence at intermediate wavenumbers. Predictions of the theory are confronted with observational data on both background expansion and large-scale structure, although care must be taken to ensure a model is stable. It is found that while the stable models tit the data well, they feature deviations from the standard cosmology that could be detected or ruled out by near-future experiments.

Place, publisher, year, edition, pages
2014. Vol. 2014, no 10, 066- p.
Keyword [en]
modified gravity, cosmological parameters from LSS, cosmological perturbation theory, dark energy theory
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-158453DOI: 10.1088/1475-7516/2014/10/066ISI: 000345990800067ScopusID: 2-s2.0-84908513346OAI: diva2:777062
EU, European Research Council, StG2010-257080

QC 20150108

Available from: 2015-01-08 Created: 2015-01-08 Last updated: 2015-01-08Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Koivisto, Tomi S.
By organisation
Nordic Institute for Theoretical Physics NORDITA
In the same journal
Journal of Cosmology and Astroparticle Physics
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 26 hits
ReferencesLink to record
Permanent link

Direct link