The Cosmic Microwave Background (CMB) radiation from the Wilkinson Microwave Anisotropy Probe (WMAP) satellite mission (14) is one of the main sources of data about the early universe. Deciphering the CMB in terms of the density perturbations, gravity wave polarization, power spectrum and its various indices is a formidable task. It also requires the heavy CMB mathematical formalism based on General Relativity — see eg., the textbooks (17–19). Fortunately, we do not need that formalism for our purposes, since the relevant indices can also be introduced in terms of the inflaton scalar potential (Sec. 4). We assume that inflation did happen. There exist many inflationary models.
