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arXiv · 1412.7620

Chromo-Natural Inflation in the Axiverse

Ippei Obata·Takashi Miura·Jiro Soda
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Abstract

We study chromo-natural inflation in the axiverse. More precisely, we investigate natural inflation with two axions coupled with a SU(2) gauge field. Assuming a hierarchy between the coupling constants, we find that for certain initial conditions, conventional natural inflation commences and continues for tens of e-foldings, and subsequently chromo-natural inflation takes over from natural inflation. For these solutions, we expect that the predictions are in agreement with observations on CMB scales. Moreover, since chromo-natural inflation occurs in the latter part of the inflationary stage, chiral primordial gravitational waves are produced in the interesting frequency range higher than $10^{-10}$Hz, which might be detectable by future gravitational wave observations.

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Ippei Obata, Takashi Miura, Jiro Soda. 2014-12-24. Chromo-Natural Inflation in the Axiverse. https://doi.org/10.1103/physrevd.92.063516

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