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Particular solutions in bimetric theory and their implications
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2014 (English)In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 23, no 13, 1443002Article in journal (Refereed) Published
Abstract [en]

Ghost-free bimetric theory can describe gravity in the presence of an extra spin-2 field. In this paper, we study certain aspects of dynamics in this theory: (i) It is shown that if either of the metrics is an Einstein solution, then the other is always forced to be Einstein, too. For a class of bimetric models, this constraint is stronger and as soon as one metric is Einstein, the other metric is forced to be proportional to it. As a consequence, the models in this class avoid a branch of pathological solutions that exhibit determinant singularities or nonlinear ghosts. These constraints persists in a generalized form when sources are included, but are destroyed in the massive gravity limit of the theory. (ii) For another class of bimetric models, we show the existence of solutions that do not admit a massive gravity limit. A bimetric model that could exhibit a nonlinear version of partially massless symmetry belongs to both these classes. It is argued that if such a model exist, its symmetry will not survive in the massive gravity limit.

Place, publisher, year, edition, pages
2014. Vol. 23, no 13, 1443002
Keyword [en]
Modified gravity, massive gravity
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-114763DOI: 10.1142/S0218271814430020ISI: 000349327300003OAI: oai:DiVA.org:su-114763DiVA: diva2:794325
Note

AuthorCount:3;

Available from: 2015-03-11 Created: 2015-03-09 Last updated: 2017-12-04Bibliographically approved

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Hassan, S. FawadSchmidt-May, Angnis
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