Pseudo-Goldstone dark matter in a radiative inverse seesaw scenario
Journal of High Energy Physics(2023)
摘要
bstract We consider a scale-invariant inverse seesaw model with dynamical breaking of gauge symmetry and lepton number. In some regions of the parameter space, the Majoron — the pseudo-Goldstone of lepton number breaking — is a viable dark matter candidate. The bound on the Majoron decay rate implies a very large dilaton vacuum expectation value, which also results in a suppression of other dark matter couplings. Because of that, the observed dark matter relic abundance can only be matched via the freeze-in mechanism. The scalar field which gives mass to heavy neutrinos can play the role of the inflaton, resulting in a tensor-to-scalar ratio r ≲ 0 . 01 for metric inflation and r ≲ 0 . 21 for Palatini gravity.
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关键词
Models for Dark Matter,Particle Nature of Dark Matter,Sterile or Heavy Neutrinos
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