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Dark matter via massive bigravity
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.
2015 (English)In: Physical Review D, ISSN 1550-7998, Vol. 91, no 10, 103518Article in journal (Refereed) Published
Abstract [en]

In this work we investigate the existence of relativistic models for dark matter in the context of bimetric gravity, used here to reproduce the modified Newtonian dynamics (MOND) at galactic scales. For this purpose we consider two different species of dark matter particles that separately couple to the two metrics of bigravity. These two sectors are linked together via an internal U(1) vector field, and some effective composite metric built out of the two metrics. Among possible models only certain classes of kinetic and interaction terms are allowed without invoking ghost degrees of freedom. Along these lines we explore the number of allowed kinetic terms in the theory and point out the presence of ghosts in a previous model. Finally, we propose a promising class of ghost-free candidate theories that could provide the MOND phenomenology at galactic scales while reproducing the standard cold dark matter model at cosmological scales.

Place, publisher, year, edition, pages
2015. Vol. 91, no 10, 103518
Keyword [en]
Modified Newtonian Dynamics, Field Equations, Galaxy Clusters, Framework, Mond, Phenomenology, Constraints
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-169263DOI: 10.1103/PhysRevD.91.103518ISI: 000354979300002OAI: diva2:821645

QC 20150615

Available from: 2015-06-15 Created: 2015-06-12 Last updated: 2015-06-15Bibliographically approved

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Heisenberg, Lavinia
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