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2019

Dark matter from dark photons: a taxonomy of dark matter production

Hambye, Thomas, Tytgat, Michel H. G., Vandecasteele, Jérôme et al.

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We analyse how dark matter (DM) can be produced in the early universe, working in the framework of a hidden sector charged under a U(1)' gauge symmetry and interacting with the Standard Model through kinetic mixing.

Depending on the masses of the dark matter particle and of the dark photon, as well as on the hidden U(1)' gauge coupling and the kinetic mixing parameter, we classify all the distinct regimes along which the observed dark matter relic density can be accounted for.
We find that 9 regimes are potentially operative to produce the DM particles and this along 5 distinct dynamical mechanisms.
Among these, 4 regimes are new and correspond to regimes in which the DM particles are produced by on-shell dark photons.

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