Tensor Spectra Templates for Axion-Gauge Fields Dynamics during Inflation

Abstract

$SU(2)$ gauge fields can generate large gravitational waves during inflation, if they are coupled to an axion which can be either the inflaton or a spectator field. The shape of the produced tensor power spectrum ${\mathcal{P}}_h$ depends on the form of the axion potential. We derive analytic expressions and provide general templates for ${\mathcal{P}}_h$ for various types of the spectator axion potential. Furthermore, we explore the detectability of the oscillatory feature, which is present in ${\mathcal{P}}_h$ in the case of an axion monodromy model, by possible future CMB B-mode polarization observations.

31 pages, 11 figures

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• Axion-Gauge Field Dynamics with Backreaction
• Backreaction of axion-SU(2) dynamics during inflation
• Generation of Primordial Black Holes and Gravitational Waves from Dilaton-Gauge Field Dynamics
• LiteBIRD Science Goals and Forecasts. A Case Study of the Origin of Primordial Gravitational Waves using Large-Scale CMB Polarization
• Can primordial parity violation explain the observed cosmic birefringence?
• Gravitational waves from spectator Gauge-flation
• Parity-violating scalar trispectrum from a rolling axion during inflation
• Gravitational wave trispectrum in the axion-SU(2) model
• Gravitational waves detectable in laser interferometers from axion-SU(2) inflation
• Magnetogenesis from axion-SU(2) inflation
• Chromo-natural inflation supported by enhanced friction from Horndeski gravity
• Relic Cosmological Vector Fields and Inflationary Gravitational Waves
• Effective Field Theory of Chiral Gravitational Waves
• Perturbative limits on axion-SU(2) gauge dynamics during inflation from the energy density of spin-2 particles