Cosmology in modified f(R,T)-gravity theory in a variant Λ(T) scenario-revisited

Three new cosmological models of the present Universe are obtained with f(R,T) modified theory of gravity proposed by Harko et al. [Phys. Rev. D 84 (2011) 024020, arXiv: 1104.2669 [gr-qc]] in a general class of Bianchi space-time. In this paper, we have generalized the modified f(R, T) field equations with.(T)-gravity, where R and T denote the curvature scalar and the trace of the stress-energy-momentum tensor, respectively. To find the deterministic solutions we have considered the linearly varying deceleration parameter q proposed by Akarsu and Dereli [Cosmological models with linearly varying deceleration parameter, Int. J. Theor. Phys. 51 (2011) 612]. We have made the analyses of the variation of pressure, energy density and cosmological term with cosmic time. It is observed that our derived models are unstable in early time whereas they are stable at late and future time (i.e. at present epoch). The physical and geometric properties of all three models are studied in detail.