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Minimal Warm Inflation

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arxiv 1910.07525 v3 pith:GZXAHVZG submitted 2019-10-16 hep-ph astro-ph.COhep-th

Kim V. Berghaus , Peter W. Graham , David E. Kaplan This is my paper
classification hep-phastro-ph.COhep-th
keywords inflationcouplinginflatonthermalaxion-likebatheasilyeven
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Slow-roll inflation is a successful paradigm. However we find that even a small coupling of the inflaton to other light fields can dramatically alter the dynamics and predictions of inflation. As an example, the inflaton can generically have an axion-like coupling to gauge bosons. Even relatively small couplings will automatically induce a thermal bath during inflation. The thermal friction from this bath can easily be stronger than Hubble friction, significantly altering the usual predictions of any particular inflaton potential. Thermal effects suppress the tensor-to-scalar ratio $r$ significantly, and predict unique non-gaussianities. This axion-like coupling provides a minimal model of warm inflation which avoids the usual problem of thermal backreaction on the inflaton potential. As a specific example, we find that hybrid inflation with this axion-like coupling can easily fit the current cosmological data.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Searching for Folded Primordial Non-Gaussianity with Galaxy Surveys

    astro-ph.CO 2026-07 conditional novelty 7.0 of 10

    The galaxy bispectrum, not the power spectrum, is the main probe of folded primordial non-Gaussianity; narrow folded signals are washed out by Fourier-space binning.

  2. Heterotic Warm Inflation

    hep-th 2025-09 conditional novelty 7.0 of 10

    In a heterotic-string-inspired two-field warm inflation model, the axion drives inflation while thermal corrections from gauge fields block sustained dilaton-driven inflation.

  3. Preheated inflation

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Slow-roll inflation can sustain a subdominant non-thermal radiation bath through narrow parametric resonance, producing observable oscillatory features in the curvature power spectrum and secondary gravitational waves.

  4. Behaviour of $\alpha$-attractors in Warm Inflation

    astro-ph.CO 2025-06 reject novelty 5.0 of 10

    In strongly dissipative warm inflation, T, E, and polynomial alpha-attractor models lose the cold-inflation attractor convergence in the n_s-r plane.

  5. 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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