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Axion monodromy inflation with multi-natural modulations · Around

2014

Axion monodromy inflation with multi-natural modulations

Higaki, Tetsutaro, Kobayashi, Tatsuo, Seto, Osamu et al.

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We study parameter space in the axion monodromy inflation corrected by dynamically generated terms involving with the axion.

The potential has the linear potential with multiple sinusoidal functions, which play a role in generating modulations.
We show that this potential leads both to a large tensor-to-scalar ratio $r_T \sim 0.16$ and to a large negative running of spectral index $\alpha_s \sim - (0.02 -0.03)$.
To realize these results, a small hierarchy among dynamical scales is required whereas the decay constants in sinusoidal functions remain sub-Planckian in this model.

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