Speaker
Mr
Tushar Gupta
(Helsinki Institute of Physics, University of Helsinki)
Description
We investigate the possibility of saturating the relic density bound with light higgsinos. When the minimal supersymmetric Standard Model is extended with right-handed neutrino superfields and the seesaw scale is very low, right sneutrinos can be produced via the freeze-in mechanism. In such a case we can have essentially two independent sources for dark matter, the traditional freeze-out of higgsinos and the freeze-in of right-handed sneutrinos. The heavier of these two will decay to the lighter species with a delay. We have ruled out such a scenario for all seesaw models as the lifetime of sterile neutrino, produced via Dodelson-Widrow mechanism, exceeds the age of the universe and will contribute to the relic density.
Primary authors
Dr
Harri Waltari
(Department of Physics and Astronomy, Uppsala University)
Prof.
Katri Huitu
(Helsinki Institute of Physics, University of Helsinki)
Dr
Matti Heikinheimo
(Helsinki Institute of Physics, University of Helsinki)
Mr
Tushar Gupta
(Helsinki Institute of Physics, University of Helsinki)
