LRS Bianchi I Cosmological Model with Strange Quark Matter in <i>f</i>(<i>R</i>, <i>T</i>) Gravity

Abstract

A locally rotationally symmetric Bianchi-I model filled with strange quark matter is explored in f(R,T)=R+2f(T) gravity, where R is the Ricci scalar, T is the trace of the energy-momentum tensor and λ is an arbitrary constant. Exact solutions are obtained by assuming that the expansion scalar is proportional to the shear scalar. The model is found to be physically viable for λ−14. Strange quark matter at early times mimics ultra-relativistic radiation whereas at late times it behaves as dust, quintessence, or even the cosmological constant for some specified values of λ. The effective matter acts as stiff matter irrespective of the matter content and of f(R,T) gravity. The model is shear-free at late times but remains anisotropic throughout the evolution.

Keywords

• strange quark matter
• <i>f</i>(<i>R</i>, <i>T</i>) gravity
• Bianchi-I model
• dark energy