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.
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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.