Lepton parity dark matter and naturally unstable domain walls

Résumé fourni par la source

We propose a simple and predictive setup that connects neutrino masses, dark matter (DM), and gravitational waves. A minimal lepton parity DM scenario is considered where the residual symmetry ( − 1 ) L from the type I seesaw acts as the dark parity D = ( − 1 ) L + 2 j , ensuring DM stability without imposing any new symmetry. A singlet Majorana fermion S with even lepton parity serves as the DM candidate, interacting via a real scalar σ which is also even lepton parity. The scalar potential possesses an accidental Z 2 symmetry, whose spontaneous breaking gives rise to unstable domain walls in the presence of explicit Z 2 -breaking terms allowed by the lepton parity. The subsequent domain wall annihilation generates a stochastic gravitational wave background potentially observable at different gravitational wave experiments.

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