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 + highL data, 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. © 2014 Elsevier B.V.

Running spectral index from large-field inflation with modulations revisited / Czerny, M.; Kobayashi, T.; Takahashi, F.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 735:(2014), pp. 176-180. [10.1016/j.physletb.2014.06.018]

Running spectral index from large-field inflation with modulations revisited

Kobayashi T.
;
2014-01-01

Abstract

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 + highL data, 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. © 2014 Elsevier B.V.
2014
735
176
180
10.1016/j.physletb.2014.06.018
https://arxiv.org/abs/1403.4589
Czerny, M.; Kobayashi, T.; Takahashi, F.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/124831
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