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Cosmology with higher-derivative matter fields

May 27, 2014

22 pages

Published in:

Int.J.Geom.Meth.Mod.Phys. 13 (2016) 07, 1650102

Published: Jun 21, 2016

e-Print:

1405.7019 [gr-qc]

DOI:

10.1142/S0219887816501024

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Abstract: (World Scientific)

We investigate the cosmological implications of a new class of modified gravity, where the field equations generically include higher-order derivatives of the matter fields, arising from the introduction of non-dynamical auxiliary fields in the action. Imposing a flat, homogeneous and isotropic geometry, we extract the Friedmann equations, obtaining an effective dark-energy sector containing higher-derivatives of the matter energy density and pressure. For the cases of dust, radiation and stiff matter, we analyze the cosmological behavior, finding accelerating, de Sitter and non-accelerating phases, dominated by matter or dark-energy. Additionally, the effective dark-energy equation-of-state parameter can be quintessence-like, cosmological-constant-like or even phantom-like. The detailed study of these scenarios may provide signatures, that could distinguish them from other candidates of modified gravity.

Note:

22 pages, 8 figures, version published in Int.J.Geom.Meth.Mod.Phys

Modified gravity
higher-order derivatives
dark-energy
gravitation: model
derivative: high
matter: energy
dark energy
cosmological constant
expansion: acceleration
dark energy: equation of state

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