Effects of space–time noncommutativity on the angular power spectrum of the CMB Original Research Article

We investigate an inflationary model of the universe based on the assumption that space–time is noncommutative in the very early universe. We analyze the effects of space–time noncommutativity on the quantum fluctuations of an inflaton field and investigate their contributions to the cosmic microwave background (CMB). We show that the angular power spectrum l(l+1)Cl generically has a sharp damping for lower l if we assume that the last scattering surface is traced back to fuzzy spheres at the times when large-scale modes cross the Hubble horizon.