Exploring Leptogenesis, WIMP Dark Matter, and Gravitational Waves in an extended Scalar Framework
This work extends Type-I seesaw models by adding a scalar mediator to connect neutrinos, dark matter, and right-handed neutrinos. It shows how this extended symmetry structure generates neutrino masses, drives leptogenesis for baryogenesis, and produces gravitational waves from topological defects. The study also explores the resulting dark matter relic abundance.