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- Title
Cosmic evolution in the background of non-minimal coupling in f(R,T,RμνTμν) gravity.
- Authors
Zubair, M.; Zeeshan, Muhammad
- Abstract
In this manuscript, we are interested to address the issue of cosmic expansion in the background of matter-geometry coupling. For this purpose we consider f(R,T,Q) modified theory (where R is the Ricci Scalar, T is the trace of energy-momentum tensor (EMT) Tuv and Q=RuvTuv is interaction of EMT Tμν and Ricci Tensor Ruv). We formulate modified field equations in the background of flat Friedmann-Lemaître-Robertson-Walker (FLRW) model which is defined as ds2=dt2−a(t)2(dx2+dy2+dz2), where a(t) represents the scale factor. In this formalism energy density is found using covariant divergence of modified field equations. ρ involves a contribution from non-minimal matter geometry coupling which helps to study different cosmic eras based on equation of state (EOS). Furthermore, we apply the energy bounds to constrain the model parameters establishing a pathway to discuss the cosmic evolution for best suitable parameters in accordance with recent observations.
- Subjects
ENERGY density; ENERGY momentum relationship; GRAVITY; EQUATIONS of state; ASTRONOMICAL observations; INTERSTELLAR medium
- Publication
Astrophysics & Space Science, 2018, Vol 363, Issue 12, p1
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-018-3471-2