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  Cosmological dynamics of mimetic gravity

Dutta, J., Khyllep, W., Saridakis, E. N., Tamanini, N., & Vagnozzi, S. (2018). Cosmological dynamics of mimetic gravity. Journal of Cosmology and Astroparticle Physics, 2018(02): 041. doi:10.1088/1475-7516/2018/02/041.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-3D66-A Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E9EA-0
Genre: Journal Article

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 Creators:
Dutta, Jibitesh, Author
Khyllep, Wompherdeiki, Author
Saridakis, Emmanuel N., Author
Tamanini, Nicola1, Author              
Vagnozzi, Sunny, Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,High Energy Physics - Theory, hep-th
 Abstract: 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.

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 Dates: 2017-11-202018
 Publication Status: Published in print
 Pages: 29 pages and 7 figures. Comments are very welcome
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 Identifiers: arXiv: 1711.07290
URI: http://arxiv.org/abs/1711.07290
DOI: 10.1088/1475-7516/2018/02/041
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Title: Journal of Cosmology and Astroparticle Physics
Source Genre: Journal
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Pages: - Volume / Issue: 2018 (02) Sequence Number: 041 Start / End Page: - Identifier: -