A Higgs portal inflation model is shown to enhance sourced gravitational waves from an axion-SU(2) spectator to a tensor-to-scalar ratio of about 0.04, making them detectable by LiteBIRD.
Tensor Spectra Templates for Axion-Gauge Fields Dynamics during Inflation
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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.
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Gravitational Waves dynamics with Higgs portal and U(1) X SU(2) interactions
A Higgs portal inflation model is shown to enhance sourced gravitational waves from an axion-SU(2) spectator to a tensor-to-scalar ratio of about 0.04, making them detectable by LiteBIRD.