Anisotropic cosmological model with negative constant deceleration parameter and time-decaying λ term

Abstract

Einstein's field equations are considered for a locally rotationally symmetric Bianchi type II space-time with perfect fluid and a time- decaying cosmological term Λ(t). Exact solutions of the field equations for stiff matter are obtained by applying a special law of variation for Hubble's parameter. An anisotropic cosmological model is presented with a negative constant deceleration parameter which corresponds to the accelerated phase of the present universe. The physical and kinematical behaviors of Bianchi type II cosmological models are discussed. We have also studied the consistency of the model with observational parameters through kinematic tests. It has been shown that the model is compatible with the recent observations.