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Mimicking dark matter and dark energy in a mimetic model compatible with GW170817
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Number of Authors: 42018 (English)In: Physics of the Dark Universe, ISSN 0953-8585, E-ISSN 2212-6864, Vol. 22, p. 108-115Article in journal (Refereed) Published
Abstract [en]

The recent observation of the gravitational wave event GW170817 and of its electromagnetic counterpart GRB170817A, from a binary neutron star merger, has established that the speed of gravitational waves deviates from the speed of light by less than one part in 10(15). As a consequence, many extensions of General Relativity are inevitably ruled out. Among these we find the most relevant sectors of Horndeski gravity. In its original formulation, mimetic gravity is able to mimic cosmological dark matter, has tensorial perturbations that travel exactly at the speed of light but has vanishing scalar perturbations and this fact persists if we combine mimetic with Horndeski gravity. In this work, we show that implementing the mimetic gravity action with higher-order terms that break the Horndeski structure yields a cosmological model that satisfies the constraint on the speed of gravitational waves and mimics both dark energy and dark matter with a non-vanishing speed of sound. In this way, we are able to reproduce the Lambda CDM cosmological model without introducing particle cold dark matter.

Place, publisher, year, edition, pages
2018. Vol. 22, p. 108-115
Keywords [en]
Modified gravity, Mimetic gravity, Dark matter, Dark energy, Gravitational waves
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-163587DOI: 10.1016/j.dark.2018.10.001ISI: 000451733200012OAI: oai:DiVA.org:su-163587DiVA, id: diva2:1277969
Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved

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Rinaldi, MassimilianoVagnozzi, Sunny
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Nordic Institute for Theoretical Physics (Nordita)
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Physics of the Dark Universe
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