Singh, V.; Jokweni, S.; Beesham, A. Plane Symmetric Cosmological Model with Strange Quark Matter in f(R,T) Gravity. Universe2023, 9, 408.
Singh, V.; Jokweni, S.; Beesham, A. Plane Symmetric Cosmological Model with Strange Quark Matter in f(R,T) Gravity. Universe 2023, 9, 408.
Singh, V.; Jokweni, S.; Beesham, A. Plane Symmetric Cosmological Model with Strange Quark Matter in f(R,T) Gravity. Universe2023, 9, 408.
Singh, V.; Jokweni, S.; Beesham, A. Plane Symmetric Cosmological Model with Strange Quark Matter in f(R,T) Gravity. Universe 2023, 9, 408.
Abstract
A locally-rotationally-symmetric Bianchi-I model filled with strange quark matter (SQM)
is explored in f(R, T) gravity. We take f(R, T) = R + 2 f(T) = R + 2λT, where R is the Ricci scalar, T
is the trace of 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. This yields a constant value
for the deceleration parameter, q = 2, which corresponds to the decelerated phase of the universe.
The model is found to be physically viable for λ < −1. SQM during early evolution mimics ultra-relativistic radiation whereas at late times, it behaves as dust, quintessence or even the cosmological
constant depending on the value of λ. The effective matter acts as a stiff fluid irrespective of the
matter content and of the f(R, T) terms. The model is shear free at late times but remains anisotropic
throughout the evolution. In the absence of the f(R, T) terms, SQM accelerates the universe. In the
specific case when SQM vanishes at late times, the effect of f(R, T) is to accelerate the universe. The
model admits the possibility that SQM could be an alternative to dark energy.
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