FIVE DIMENSIONAL STIFF FLUIDS WITH VARIABLE DISPLACEMENT VECTOR IN LYRA MANIFOLD

I n this paper we gave five dimensional cosmological strings with stiff fluid in Lyra Manifold in the presence of cosmological constant . Some physical aspects of the models are discussed. It is observed that the expansion scalar is finite at initial epoch and decreases as time increases and in case of anisotropy the shape of the model changes uniformity in time coordinate direction only and the rate of change of the universe becomes slow with the increase of time.