Large-Scale Anisotropy of the Cosmic Background Radiation Due to Primordial Density and Gravitational-Wave Perturbations

摘要

The possibility that part of the recently discovered large-scale anisotropy of the cosmic background radiation is aroused from primordial density and gravitational-wave perturbations through the Sachs-Wolfe effect, is investigated in both closed and open models in connection with the severe constraint for the small-scale anisotropy. It is concluded that, in order to explain the dipole anisotropy of the order of 10 exp -3 by density perturbations, closed models and density fluctuation spectrums not steeper than ''white noise'' one are required, and that gravitational-wave perturbations cannot contribute to the possible quadrupole anisotropy of the order of 10 exp -4 . (Atomindex citation 14:804074)