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Cosmological viability of massive gravity with generalized matter coupling
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-9403-8565
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2015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, Vol. 2015, no 4, 027Article in journal (Refereed) Published
Abstract [en]

There is a no-go theorem forbidding flat and closed FLRW solutions in massive gravity on a flat reference metric, while open solutions are unstable. Recently it was shown that this no-go theorem can be overcome if at least some matter couples to a hybrid metric composed of both the dynamical and the fixed reference metric. We show that this is not compatible with the standard description of cosmological sources in terms of effective perfect fluids, and the predictions of the theory become sensitive either to the detailed field-theoretical modelling of the matter content or to the presence of additional dark degrees of freedom. This is a serious practical complication. Furthermore, we demonstrate that viable cosmological background evolution with a perfect fluid appears to require the presence of fields with highly contrived properties. This could be improved if the equivalence principle is broken by coupling only some of the fields to the composite metric, but viable self-accelerating solutions due only to the massive graviton are difficult to obtain.

Place, publisher, year, edition, pages
2015. Vol. 2015, no 4, 027
Keyword [en]
dark energy theory, modified gravity
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-166977DOI: 10.1088/1475-7516/2015/04/027ISI: 000355742500028ScopusID: 2-s2.0-84928717359OAI: diva2:814762
EU, European Research Council, StG2010-257080Swedish Research Council

QC 20150528

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

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Koivisto, Tomi Sebastian
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Nordic Institute for Theoretical Physics NORDITA
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