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Cosmological dynamics of mimetic gravity
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Number of Authors: 5
2018 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 2, article id 041Article in journal (Refereed) Published
Abstract [en]

We present a detailed investigation of the dynamical behavior of mimetic gravity with a general potential for the mimetic scalar field. Performing a phase-space and stability analysis, we show that the scenario at hand can successfully describe the thermal history of the universe, namely the successive sequence of radiation, matter, and dark-energy eras. Additionally, at late times the universe can either approach a de Sitter solution, or a scaling accelerated attractor where the dark-matter and dark-energy density parameters are of the same order, thus offering an alleviation of the cosmic coincidence problem. Applying our general analysis to various specific potential choices, including the power-law and the exponential ones, we show that mimetic gravity can be brought into good agreement with the observed behavior of the universe. Moreover, with an inverse square potential we find that mimetic gravity offers an appealing unified cosmological scenario where both dark energy and dark matter are characterized by a single scalar field, and where the cosmic coincidence problem is alleviated.

Place, publisher, year, edition, pages
2018. no 2, article id 041
Keyword [en]
dark energy theory, modified gravity
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-154652DOI: 10.1088/1475-7516/2018/02/041ISI: 000425710000002OAI: oai:DiVA.org:su-154652DiVA, id: diva2:1202205
Available from: 2018-04-27 Created: 2018-04-27 Last updated: 2018-04-27Bibliographically approved

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Vagnozzi, 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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