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The nature of spacetime in bigravity: Two metrics or none?
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-9403-8565
2015 (English)In: General Relativity and Gravitation, ISSN 0001-7701, E-ISSN 1572-9532, Vol. 47, no 1, 1838- p.Article in journal (Refereed) Published
Abstract [en]

The possibility of matter coupling to two metrics at once is considered. This appears natural in the most general ghost-free, bimetric theory of gravity, where it unlocks an additional symmetry with respect to the exchange of the metrics. This double coupling, however, raises the problem of identifying the observables of the theory. It is shown that if the two metrics couple minimally to matter, then there is no physical metric to which all matter would universally couple, and that moreover such an effective metric generically does not exist even for an individual matter species. By studying point particle dynamics, a resolution is suggested in the context of Finsler geometry.

Place, publisher, year, edition, pages
2015. Vol. 47, no 1, 1838- p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-158260DOI: 10.1007/s10714-014-1838-4ISI: 000345962500004Scopus ID: 2-s2.0-84912567383OAI: oai:DiVA.org:kth-158260DiVA: diva2:778214
Funder
EU, European Research Council, StG2010-257080
Note

QC 20150109

Available from: 2015-01-09 Created: 2015-01-07 Last updated: 2017-12-05Bibliographically approved

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Koivisto, Tomi S.

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