Decay of inhomogeneities from the spin-torsion fluctuations in the early stages of inflation

Abstract

The spin-torsion fluctuations are shown to act as source of decay of inhomogeneities in the early stages of inflationary de Sitter universe.This seems to be a resul of the repulsive nature of the spin-torsion effects.This result is shown through the investigation of the evolution equation of density perturbations in Einstein-Cartan cosmology.We also show that it is possible to place limits on torsion in the universe from the CMBR temperature anisotropy from the computations we made.The decay of inhomogeneities is not enough however to stop the structure formation as galaxies because the growth of inhomogeneitis dominates the torsion effects and the only effect of torsion seems to decrease very weakly the speed of formation of galaxies.