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Warm inflation with a heavy QCD axion
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We propose the first model of warm inflation in which the particle production emerges directly from coupling the inflaton to Standard Model particles. Warm inflation, an early epoch of sustained accelerated expansion at finite temperature, is a compelling alternative to cold inflation, with distinct predictions for inflationary observables such as the amplitude of fluctuations, the spectral tilt, the tensor-to-scalar ratio, and non-gaussianities. In our model a heavy QCD axion acts as the warm inflaton whose coupling to Standard Model gluons sources the thermal bath during warm inflation. Axion-like couplings to non-Abelian gauge bosons have been considered before as a successful microphysical theory with emerging thermal friction that can maintain finite temperature during inflation via sphaleron heating. However, the presence of light fermions charged under the non-Abelian group suppresses particle production, hindering a realization of warm inflation by coupling to QCD. We point out that the Standard Model quarks can be heavy during warm inflation if the Higgs field resides in a high-energy second minimum which restores efficient sphaleron heating. A subsequent large reheating temperature is required to allow the Higgs field to relax to its electroweak minimum. Exploring a scenario in which hybrid warm inflation provides the large reheating temperature, we show that future collider and beam dump experiments have discovery potential for a heavy QCD axion taking the role of the warm inflaton.
Forward citations
Cited by 6 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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WI2easy: warm inflation dynamics made easy
WI2easy provides a public Mathematica implementation that computes warm inflation dynamics and curvature perturbation spectra via a deterministic Fokker-Planck approach, and shows that the universality of the G(Q) cor...
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Warm multi natural inflation
In warm multi-natural inflation with a cubic temperature dissipation coefficient, the curvature power spectrum grows sharply after the weak-to-strong dissipation transition, generating detectable scalar-induced gravit...
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Scalaron-driven Dark Matter during Warm Inflation via UV Freeze--in
Warm Higgs-Starobinsky inflation can produce the observed dark matter abundance for 1 MeV and 100 GeV masses through dimension-8 and dimension-9 freeze-in operators, with production concentrated at the inflation-to-ra...
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Viability of warm inflation with standard model interactions
Using the WI2easy code, the Standard Model gluon-coupled warm inflation model remains viable, with a Hubble-exit dissipation ratio Q* between 0.0076 and 30 and inflaton thermalization for Q* above about 0.08.
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A multi-axion model of inflation and dark matter
A 300-mode Kaluza-Klein axion tower is proposed as a unified inflaton and dark-matter sector, but the lightest state's quoted lifetime contradicts the paper's own decay-rate formula.
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