Speaker
Nimmala Narendra
(IACS, Kolkata)
Description
Abstract:We study the N2 Leptogenesis in the presence of an extra complex singlet scalar field under U (1) symmetry extension. The VEV of the new scalar spontaneously breaks the U (1) symmetry. A remnant CP-like Z2 symmetry stabilizes the imaginary part of the complex scalar field as a Pseudo-Goldstone DM. The additional scalar which couples to RHN opens up new decay channels which can lead to a larger CP- violation in generating the lepton asymmetry.
