Detection of cosmic microwave background anisotropy at 1.8 deg: Theoretical implications on inflationary models

Publisher Website
Google Scholar
Abstract
Theoretical scenarios for the formation of large-scale structure in theud universe are strongly constrained by ARGO (a balloon borne experimentud reporting detection of cosmic microwave background (CMB) anisotropy atud 1.8 deg) and Cosmic Background Explorer/Differential Microwaveud Radiometer (COBE/DMR). Here we consider flat hybrid models with eitherud scale invariant or tilted (n not equal to 1) initial conditions. For nud less than 1, we take into account the effect of a primordial backgroundud of gravitational waves, predicted by power-law inflation scenarios. Theud main result of our analysis is that the ARGO and COBE/DMR data select aud range of values for the primordial spectral index: n =ud 0.95$^{+0.25$$_-0.15$ (values of n outside this range canud be rejected at more than 95% confidence level). These bounds areud basically independent of the cosmological abundance of baryons (at leastud in the range allowed from primordial nucleosynthesis) and of the ratioud of cold to hot dark matter. So, flat, cold, or mixed dark matter models,ud with scale-invariant initial conditions and a standard recombinationud history, successfully take into account the CMB anisotropy detected atud intermediate and large angular scales.ud

This publication has 0 references indexed in Scilit: