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Quantum corrections in massive bigravity and new effective composite metrics
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2015 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 32, no 10, 105011Article in journal (Refereed) Published
Abstract [en]

We compute the one-loop quantum corrections to the interactions between the two metrics of the ghost-free massive bigravity. When considering gravitons running in the loops, we show how the structure of the interactions gets destabilized at the quantum level, exactly in the same way as in its massive gravity limit. A priori one might have expected a better quantum behavior, however, the broken diffeomorphism invariance out of the two initial diffeomorphisms in bigravity has similar consequences at the quantum level as the broken diffeomorphism in massive gravity. From lessons of the generated quantum corrections through matter loops we propose yet other types of effective composite metrics to which the matter fields can couple. Among these new effective metrics there might be one or more that could provide interesting phenomenology and important cosmological implications.

Place, publisher, year, edition, pages
2015. Vol. 32, no 10, 105011
Keyword [en]
bigravity, massive gravity, quantum corrections, coupling to matter
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-172239DOI: 10.1088/0264-9381/32/10/105011ISI: 000355238300011ScopusID: 2-s2.0-84928784949OAI: diva2:847908

QC 20150821

Available from: 2015-08-21 Created: 2015-08-14 Last updated: 2015-08-21Bibliographically approved

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Heisenberg, Lavinia
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