LRS Bianchi Type II Perfect Fluid Cosmological Models in Normal Gauge for Lyra's Manifold

The present study deals with spatially homogeneous and locally rotationally symmetric (LRS) Bianchi type II cosmological models of perfect fluid distribution of matter for the field equations in normal gauge for Lyra's manifold where gauge function beta is taken as time dependent. To get the deterministic models of the universe, we assume that the expansion (theta) in the model is proportional to the shear (sigma). This leads to condition R = mS(n), where R and S are metric potentials, m and n are constants. We have obtained two types of models of the universe for two different values of n. It has been found that the displacement vector beta behaves like cosmological term Lambda in the normal gauge treatment and the solutions are consistent with recent observations. Some physical and geometric behavior of these models are also discussed.