Relating leptogenesis and dark matter
Michel H. G. Tytgat
TL;DR
Addressing the coincidence $\Omega_{dm}/\Omega_b\sim 5$, the paper proposes Matter Genesis in a left-right symmetric framework to relate baryogenesis to dark matter production through a shared $B-L$ asymmetry. The main approach introduces a colored messenger $D$ with $M_D\sim \mathrm{TeV}$ that generates a dark-sector $B-L$ asymmetry and, via $D$ decay after electroweak symmetry breaking, yields non-thermal $\nu_R$ dark matter with $M\sim 1$ GeV and a warm spectrum. The work relies on a universal see-saw setup with singlets $U,D,E,N$ and heavy Majorana states to realize leptogenesis and reconcile the visible and dark asymmetries. It predicts limited direct detection but potential collider signals for TeV-scale states and offers a concrete alternative to thermal WIMP dark matter with implications for structure formation.
Abstract
A scenario that relates the abundance of dark matter to the baryon asymmetry of the Universe is presented. In this scenario, based on a left-right extension of the Standard Model, dark matter is made of light, ~ 1 GeV, right-handed Majorana neutrinos.