Non-thermal right-handed sneutrino dark matter and the Omega_DM/Omega_b problem

Details Non-thermal right-handed sneutrino dark matter and the Omega_DM/Omega_b problem Non-thermal right-handed sneutrino dark matter and the Omega_DM/Omega_b problem

2007-01-31

arxiv.org/abs/hep-ph/0701266v4

JHEP 0704:021,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures, 2 typos added, 1 reference added, minor corrections in section 3

Scientific paper

10.1088/1126-6708/2007/04/021

We argue that the superpartner of the Dirac right-handed neutrino is a prime candidate for dark matter created from a 'mattergenesis' mechanism. We show that due to the smallness of the Yukawa couplings, a right-handed sneutrino density created in the early Universe would not be erased by annihilations, which remain out of thermal equilibrium. It would also not be drowned by a later, additional production of right-handed sneutrinos, as the relic density of the non-thermal right-handed sneutrinos is found to be generally negligible compared to the observed dark matter density. Mild constraints on sneutrino masses and trilinear SUSY-breaking couplings are obtained. Possible mattergenesis scenarios are also mentioned

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