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Ghosts and matter couplings in massive gravity, bigravity and multigravity
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.
2014 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 90, no 12, 124042- p.Article in journal (Refereed) Published
Abstract [en]

Recently, several works have investigated the coupling to matter in ghost-free massive bigravity and multigravity and a new effective coupling to matter has been proposed. In this paper we clarify some confusion on the existence and the implications of a ghost above the strong coupling scale. We confirm that the standard constraint which is otherwise typically present in this type of theories disappears on generic backgrounds as soon as this new coupling is considered. This implies the reemergence of the BoulwareDeser ghost. Nevertheless the absence of ghost in the decoupling limit implies that the cutoff scale (if identified with the scale at which the ghost enters) is higher than the strong coupling scale. Therefore there is a valid interesting region of applicability for these couplings at scales below the cutoff.

Place, publisher, year, edition, pages
2014. Vol. 90, no 12, 124042- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-160072DOI: 10.1103/PhysRevD.90.124042ISI: 000346381200004Scopus ID: 2-s2.0-84919663624OAI: oai:DiVA.org:kth-160072DiVA: diva2:791100
Note

QC 20150225

Available from: 2015-02-26 Created: 2015-02-13 Last updated: 2017-12-04Bibliographically approved

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