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Dipolar dark matter with massive bigravity
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm University, Sweden.
2015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 2015, no 12Article in journal (Refereed) PublishedText
Abstract [en]

Massive gravity theories have been developed as viable IR modifications of gravity motivated by dark energy and the problem of the cosmological constant. On the other hand, modified gravity and modified dark matter theories were developed with the aim of solving the problems of standard cold dark matter at galactic scales. Here we propose to adapt the framework of ghost-free massive bigravity theories to reformulate the problem of dark matter at galactic scales. We investigate a promising alternative to dark matter called dipolar dark matter (DDM) in which two different species of dark matter are separately coupled to the two metrics of bigravity and are linked together by an internal vector field. We show that this model successfully reproduces the phenomenology of dark matter at galactic scales (i.e. MOND) as a result of a mechanism of gravitational polarisation. The model is safe in the gravitational sector, but because of the particular couplings of the matter fields and vector field to the metrics, a ghost in the decoupling limit is present in the dark matter sector. However, it might be possible to push the mass of the ghost beyond the strong coupling scale by an appropriate choice of the parameters of the model. Crucial questions to address in future work are the exact mass of the ghost, and the cosmological implications of the model.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2015. Vol. 2015, no 12
Keyword [en]
dark energy theory, dark matter theory, gravity, modified gravity
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-181826DOI: 10.1088/1475-7516/2015/12/026ISI: 000367884600026ScopusID: 2-s2.0-84953850387OAI: oai:DiVA.org:kth-181826DiVA: diva2:901545
Note

QC 20160208

Available from: 2016-02-08 Created: 2016-02-05 Last updated: 2016-02-24Bibliographically approved

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Heisenberg, Lavinia
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Nordic Institute for Theoretical Physics NORDITA
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