VISCOUS-FLUID COSMOLOGICAL MODELS IN THE PRESENCE OF THE ZERO-MASS SCALAR FIELD

The curvature-free (k = 0) FRW expanding cosmological model is developed corresponding to interacting viscous fluids and zero-mass scalar fields. In the absence of non-static scalar fields the model exhibits the existence of the initial singularity (Q = 0). However, with non-negative coefficient of shear viscosity, in the presence of non-static scalar fields we find that Q has a minimum value (not-equal 0). If this epoch is treated as the initial one, it may be said that the presence of scalar fields avoids the initial singularity. Other physical behaviour that the model exhibit has been discussed.