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arxiv: 1311.1599 · v2 · pith:OQYDWGJGnew · submitted 2013-11-07 · 🌌 astro-ph.CO · gr-qc· hep-th

CMB anomalies from an inflationary model in string theory

classification 🌌 astro-ph.CO gr-qchep-th
keywords largemodelpowerangularanomaliesinflationaryscalesstring
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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.

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