Bianchi Type-III Bulk Viscous and Barotropic Perfect Fluid Cosmological Models in Lyra's Geometry

We have investigated Bianchi type III bulk viscous and barotropic perfect fluid cosmological models in the frame work of Lyra's geometry. To get deterministic models of universe, we have assumed the three conditions: (i) shear scalar (sigma) is proportional to the expansion (theta). This leads to B=C (n) , where B and C are metric potentials. (ii) In presence of viscous fluid, the coefficient of viscosity of dissipative fluid is a power function of mass density xi=xi (0) rho (m) , where xi (0) and m are constant and (iii) in absence of viscosity, a proportionality relation between pressure and energy density of barotropic perfect fluid p=alpha rho, where alpha is a proportionality constant. In all the cases, we observed that the displacement vector beta is large at beginning of the universe and reduces fast during its evolution so that its nature coincide with the behavior of cosmological constant A.