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CMB anomalies from an inflationary model in string theory (1311.1599v2)
Published 7 Nov 2013 in astro-ph.CO, gr-qc, and hep-th
Abstract: Recent Planck measurements show some CMB anomalies on large angular scales, which confirms the early observations by WMAP. We show that an inflationary model, in which before the slow-roll inflation the Universe is in a superinflationary phase, can generate a large-scale cutoff in the primordial power spectrum, which may account for not only the power suppression on large angular scales, but also a large dipole power asymmetry in the CMB. We discuss an implementation of our model in string theory.