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Minimal Warm Inflation
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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.
Forward citations
Cited by 8 Pith papers
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Perturbative Dissipation in Minimal Warm Inflation
In minimal warm inflation, perturbative dissipation from Landau damping and plasmon decay produces a third-time-derivative friction term linear in alpha, but slow-roll suppression makes it at least 10^-6 smaller than ...
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Searching for Folded Primordial Non-Gaussianity with Galaxy Surveys
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.
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Heterotic Warm Inflation
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.
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Preheated inflation
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.
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Behaviour of $\alpha$-attractors in Warm Inflation
In strongly dissipative warm inflation, T, E, and polynomial alpha-attractor models lose the cold-inflation attractor convergence in the n_s-r plane.
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Stage IV CMB forecasts for warm inflation
Future CMB surveys are forecast to tighten the dissipation parameter of quartic warm inflation by up to an order of magnitude and to exclude the cubic dissipation model under a null tensor-to-scalar ratio.
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CMB constraints on $U(1)$ axion warm inflation
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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Dark Matter Freeze-In during Warm Inflation and the Seesaw Mechanism
A U(1)_{B-L} inverse-seesaw model realizes warm-inflation freeze-in of fermionic dark matter via a heavy Z' portal, with parameters adjusted to match the observed dark matter abundance and neutrino masses.
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