摘要
The locally rotationally symmetric(LRS)Bianchi type-II inflationary cosmological model is investigated for massless scalar field with flat potential and time varyingΛ.To obtain the deterministic solution,it is assumed that scale factor is a(t)~e^(Ht) as we considered previously for Bianchi type-I spacetime andΛ~a^(-2) as considered by Chen and Wu,where H is the Hubble constant and effective potential V(φ)=const;φHigg's field.It is shown that such a time varyingΛleads to no conflict with existing observations.However,it does change the predictions of standard cosmology in the matter-dominated phase and alleviates some problems in reconciling observations with the inflationary scenario.The model represents anisotropic spacetime in general.However,the model isotropizes for large values of t andβ=3H^(2),whereβis constant.The physical and geometrical aspects of the model in the context of an inflationary scenario is also discussed.
