Are leptogenesis and dark matter related?

We investigate the possibility that dark matter and the baryon asymmetry of the Universe are generated by the same mechanism, following an idea initially proposed by Kuzmin and recently discussed by Kitano and Low. In our model, based on a left-right extension of the standard model, the baryon asymmetry is generated through leptogenesis and dark matter is made of relic stable right-handed neutrinos with mass $\sim \mathrm{\text{few}}\mathrm{GeV}$. Constraints on the model imply that this form of dark matter would unfortunately escape detection.

Figure 1

Steps of the matter genesis scenario.

Figure 2

$\log (v_R/\mathrm{TeV})$ as a function of $\log (h_d)$. The different constraints: (5) solid line, (6) dashed line, (8) dotted-dashed line (the excluded region is under these lines) and (7) dotted line (the excluded region is over this line). The allowed region is shaded (in green).