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Monodromy inflation at strong coupling: $4\pi$ in the sky
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abstract
We present a simple effective field theory formulation of a general family of single field flux monodromy models for which strong coupling effects at large field values can flatten the potential and activate operators with higher powers of derivatives. These models are radiatively and non-perturbatively stable and can easily sustain $\ga 60$ efolds of inflation. The dynamics combines features of both large field chaotic inflation and $k$-inflation, both of which can suppress the tensor amplitude. Reducing the tensor-scalar ratio below the observational bound $r \lesssim 0.1$ while keeping the scalar spectral index $n_s$ within experimental bounds either yields equilateral nongaussianity $f_{NL}^{eq} \simeq {\cal O}(1)$, close to the current observational bounds, or ultimately gives very small $r$.
Forward citations
Cited by 3 Pith papers
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Very-High-Frequency Gravitational Waves from Multi-Monodromy Inflation
In multi-stage axion monodromy inflation, an interruption 50–52 efolds before the end of inflation produces a narrow gravitational-wave background peaked at ~10–300 kHz, at strains near proposed detector sensitivities.
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Uplifts in the Penumbra: Features of the Moduli Potential away from Infinite-Distance Boundaries
In the crossover region between the moduli-space interior and strict asymptotic boundaries, the flux potential of one complex structure modulus admits de Sitter uplifting minima and axion valleys with flattened potentials.
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