Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 4, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2015/04/031
Keywords
modified gravity; dark energy theory
Funding
- COMISION NACIONAL DE CIENCIAS Y TECNOLOGIA through Proyecto FONDECYT DE POSTDOCTORADO [3140244]
- DI-PUCV [123.730/2013]
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We investigate the cosmological behavior of mimetic F (R) gravity. This scenario is the F (R) extension of usual mimetic gravity classes, which are based on re-parametrizations of the metric using new, but not propagating, degrees of freedom, that can lead to a wider family of solutions. Performing a detailed dynamical analysis for exponential, power-law, and arbitrary F (R) forms, we extracted the corresponding critical points. Interestingly enough, we found that although the new features of mimetic F (R) gravity can affect the universe evolution at early and intermediate times, at late times they will not have any effect, and the universe will result at stable states that coincide with those of usual F (R) gravity. However, this feature holds for the late-time background evolution only. On the contrary, the behavior of the perturbations is expected to be different since the new term contributes to the perturbations even if it does not contribute at the background level.
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