A four-form flux that couples both to a pseudo-scalar inflaton and to gravity produces a plateau inflaton potential whose spectral index and tensor-to-scalar ratio agree with current CMB data.
Since the inflaton decays dominantly into the SM Higgs and W,Z -bosons [15], the inflaton decay rate is determined to be Γφ = m3 φ 32πM 2 P (αµ)2 1 + 3 2(αµ)2
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Chaotic inflation with four-form couplings
A four-form flux that couples both to a pseudo-scalar inflaton and to gravity produces a plateau inflaton potential whose spectral index and tensor-to-scalar ratio agree with current CMB data.