Late-time cosmological approach in mimetic f ( R ,  T ) gravity

Baffou, E. H. (Aff1, Institut de Mathématiques et de Sciences Physiques (IMSP), 01 BP 613, Porto-Novo, Benin) ; Houndjo, M. J. S. (Aff1, Institut de Mathématiques et de Sciences Physiques (IMSP), 01 BP 613, Porto-Novo, Benin) (Aff2, Faculté des Sciences et Techniques de Natitingou, Natitingou, Benin) ; Hamani-Daouda, M. (Aff3, 0000 0001 1457 1638, Département de Physique, Université de Niamey, Niamey, Niger) ; Alvarenga, F. G. (Aff4, 0000 0001 2167 4168, Departamento de Engenharia e Ciências Naturais, CEUNES, Universidade Federal do Espírito Santo, CEP 29933-415, São Mateus, ES, Brazil)

25 October 2017

Abstract: In this paper, we investigate the late-time cosmic acceleration in mimetic f ( R ,  T ) gravity with the Lagrange multiplier and potential in a Universe containing, besides radiation and dark energy, a self-interacting (collisional) matter. We obtain through the modified Friedmann equations the main equation that can describe the cosmological evolution. Then, with several models from Q(z) and the well-known particular model f ( R ,  T ), we perform an analysis of the late-time evolution. We examine the behavior of the Hubble parameter, the dark energy equation of state and the total effective equation of state and in each case we compare the resulting picture with the non-collisional matter (assumed as dust) and also with the collisional matter in mimetic f ( R ,  T ) gravity. The results obtained are in good agreement with the observational data and show that in the presence of the collisional matter the dark energy oscillations in mimetic f ( R ,  T ) gravity can be damped.

Published in: EPJC 77 (2017) 708
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-017-5291-x
License: CC-BY-3.0

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