Kavli Affiliate: Masahiro Kawasaki
| First 5 Authors: Kentaro Kasai, Masahiro Kawasaki, Kai Murai, ,
| Summary:
Sterile neutrino is a fascinating candidate for dark matter. In this paper,
we examine the Affleck-Dine (AD) leptogenesis scenario generating a large
lepton asymmetry, which can induce the resonant production of sterile neutrino
dark matter via the Shi-Fuller (SF) mechanism. We also revisit the numerical
calculation of the SF mechanism and the constraints from current X-ray and
Lyman-$alpha$ forest observations. We find that the AD leptogenesis scenario
can explain the production of sterile neutrino dark matter by incorporating a
non-topological soliton with a lepton charge called L-ball. Finally, we discuss
an enhancement of second-order gravitational waves at the L-ball decay and
investigate the testability of our scenario with future gravitational wave
observations.
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