Preacher's Preference

Calculation of Cosmic Background Radiation Anisotropies and Implications

“…(As long as space is isotropic, P depends only on the magnitude of k.) The angle brackets here denote an ensemble average, although it is frequently acceptable to assume δ is ergodic, in which case the angle brackets can equally well be regarded as a spatial average. 3 We often assume that the initial power spectrum is a power law in k: P (k) ∝ k n . As we will see below, the analogous quantity for describing the observed CMB anisotropy is the angular power spectrum:…”

“…We will now apply what we have learned to a specific example, namely the COBE DMR data. We will not describe the COBE instrument in detail; the interested reader is referred to George Smoot's contribution to this volume, as well as to the papers reporting the four-year DMR data (Bennett et al 1996, Górski et al 1996, Hinshaw et al 1996, Banday et al 1996 and references therein. We will content ourselves with mentioning a few of the most relevant facts.…”