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Renormalisation group analysis with the present measurements of the top quarkmass $m_t = 172.69\pm 0.30$ GeV indicates that the Standard Model (SM) Higgspotential becomes unstable at energy scales $\sim 10^{10}$ GeV. This may beinterpreted as hinting at new particles at high energy. The minimal extensionof the SM that can avoid this instability while leaving the SM Higgs as thesole scalar particle of the theory is obtained by adding suitable fermions tothe SM. These fermions are good dark matter candidates and the model is knownas the minimal dark matter model. We revisit the inflationary scenario based onthe minimal dark matter model, taking into account updated parameterconstraints and recent understanding of reheating dynamics. We explore themodel with different values of the right-handed neutrino mass and find that thecosmological prediction is insensitive to such details. We obtained a spectralindex of the cosmic microwave background $n_s=0.9672$ and a tensor-to-scalarratio $r=0.0031$ as a robust prediction of this scenario.

Standard Model Higgs inflation supplemented by minimal dark matter