An Infrared Cutoff Revealed by the Two Years of COBE-DMR Observations of Cosmic Temperature Fluctuations

Abstract

We show that a good fitting to the first two years of {\it COBE}-DMR observations of the two-point angular correlation function of CBR temperature is given by models with a non-zero infrared cutoff $k_{min}$ in the spectrum of the primordial density perturbations. If this cutoff comes from the finiteness of the universe, say, a topological T3 model, we find $k_{min}\sim (0.3-1.1)\pi$H${}_0/c$ with confidence level 95\%. Such a non-zero $k_{min}$ universe would also give a better match to the observations both of the RMS quadrupole anisotropy of CBR and of galaxy clustering.

11 pages, 4 figures (available upon request), Latex, AZPH-TH/94-5, to appera in Phys. Rev. Lett

References in corpus (2)

• Structure Formation with Cold + Hot Dark Matter
• Maximum-Likelihood Analysis of the COBE Angular Correlation Function

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