Change search
ReferencesLink to record
Permanent link

Direct link
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
URN: urn:nbn:se:kth:diva-158260DOI: 10.1007/s10714-014-1838-4ISI: 000345962500004ScopusID: 2-s2.0-84912567383OAI: diva2:778214
EU, European Research Council, StG2010-257080

QC 20150109

Available from: 2015-01-09 Created: 2015-01-07 Last updated: 2015-01-09Bibliographically 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
General Relativity and Gravitation
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: 31 hits
ReferencesLink to record
Permanent link

Direct link