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Dark matter scenarios with multiple spin-2 fields
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 32018 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 1, article id 014Article in journal (Refereed) Published
Abstract [en]

We study ghost-free multimetric theories for (N + 1) tensor fields with a coupling to matter and maximal global symmetry group S-N x (Z(2))(N). Their mass spectra contain a massless mode, the graviton, and N massive spin-2 modes. One of the massive modes is distinct by being the heaviest, the remaining (N - 1) massive modes are simply identical copies of each other. All relevant physics can therefore be understood from the case N = 2. Focussing on this case, we compute the full perturbative action up to cubic order and derive several features that hold to all orders in perturbation theory. The lighter massive mode does not couple to matter and neither of the massive modes decay into massless gravitons. We propose the lighter massive particle as a candidate for dark matter and investigate its phenomenology in the parameter region where the matter coupling is dominated by the massless graviton. The relic density of massive spin-2 can originate from a freeze-in mechanism or from gravitational particle production, giving rise to two different dark matter scenarios. The allowed parameter regions are very different from those in scenarios with only one massive spin-2 field and more accessible to experiments.

Place, publisher, year, edition, pages
2018. no 1, article id 014
Keywords [en]
cosmology of theories beyond the SM, dark matter theory, gravity, modified gravity
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-152569DOI: 10.1088/1475-7516/2018/01/014ISI: 000422736200005OAI: oai:DiVA.org:su-152569DiVA, id: diva2:1183614
Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved

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von Strauss, Mikael
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