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Natural Warm Inflation

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arxiv 1107.3523 v2 pith:GY2EP5DS submitted 2011-07-18 astro-ph.CO hep-ph

classification astro-ph.COhep-ph
keywords inflationnaturalaxionconstantdecayfieldmodelmodels
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abstract

We derive the requirements that a generic axion-like field has to satisfy in order to play the role of the inflaton field in the warm inflation scenario. Compared to the parameter space in ordinary natural inflation models, we find that the parameter space in our model is enlarged. In particular, we avoid the problem of having an axion decay constant $f$ that relates to the Planck scale, which is instead present in the ordinary natural inflation models; in fact, our model can easily accommodate values of the axion decay constant that lie well below the Planck scale.

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  1. CMB constraints on $U(1)$ axion warm inflation

    astro-ph.CO 2025-07 conditional novelty 4.0 of 10

    Axion-driven warm inflation with U(1) gauge fields is constrained with CMB data and remains viable for sub-Planckian decay constants, but requires large Chern-Simons couplings.

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