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Two-field axion-monodromy hybrid inflation model: Dante's Waterfall
Carone, Christopher D. Erlich, Joshua Sensharma, Anuraag Wang, Zhen
Carone, Christopher D.
Erlich, Joshua
Sensharma, Anuraag
Wang, Zhen
Abstract
We describe a hybrid axion-monodromy inflation model motivated by the Dante's Inferno scenario. In Dante's Inferno, a two-field potential features a stable trench along which a linear combination of the two fields slowly rolls, rendering the dynamics essentially identical to that of single-field chaotic inflation. A shift symmetry allows for the Lyth bound to be effectively evaded as in other axion-monodromy models. In our proposal, the potential is concave downward near the origin and the inflaton trajectory is a gradual downward spiral, ending at a point where the trench becomes unstable. There, the fields begin falling rapidly towards the minimum of the potential and inflation terminates as in a hybrid model. We find parameter choices that reproduce observed features of the cosmic microwave background, and discuss our model in light of recent results from the BICEP2 and Planck experiments.
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2015-01-01
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Physics
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https://doi.org/10.1103/PhysRevD.91.043512