Journal
PHYSICS LETTERS B
Volume 735, Issue -, Pages 176-180Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2014.06.018
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Funding
- Inoue Foundation for Science
- World Premier International Center Initiative (WPI Program), MEXT, Japan
- JSPS [24111702, 21111006, 23104008, 22244030, 21244033, 24740135]
- Grants-in-Aid for Scientific Research [24111702] Funding Source: KAKEN
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We revisit large field inflation models with modulations in light of the recent discovery of the primordial B-mode polarization by the BICEP2 experiment, which, when combined with the Planck+ WP+ highLdata, gives a strong hint for additional suppression of the CMB temperature fluctuations at small scales. Such a suppression can be explained by a running spectral index. In fact, it was pointed out by two of the present authors (TK and FT) that the existence of both tensor mode perturbations and a sizable running of the spectral index is a natural outcome of large inflation models with modulations such as axion monodromy inflation. We find that this holds also in the recently proposed multi-natural inflation, in which the inflaton potential consists of multiple sinusoidal functions and therefore the modulations are a built-in feature. (C) 2014 The Authors. Published by Elsevier B. V.
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