AbstractWe propose a minimal model that can explain the electroweak scale, neutrino masses, Dark Matter (DM), and successful inflation all at once based on the multicriticalpoint principle (MPP). The model has two singlet scalar fields that realize an analogue of the Coleman–Weinberg mechanism, in addition to the Standard Model with heavy Majorana righthanded neutrinos. By assuming a $$Z_2 $$
Z
2
symmetry, one of the scalars becomes a DM candidate whose property is almost the same as the minimal Higgsportal scalar DM. In this model, the MPP can naturally realize a saddle point in the Higgs potential at high energy scales. By the renormalizationgroup analysis, we study the critical Higgs inflation with nonminimal coupling $$\xi H^2 R$$
ξ

H

2
R
that utilizes the saddle point of the Higgs potential. We find that it is possible to realize successful inflation even for $$\xi =25$$
ξ
=
25
and that the heaviest righthanded neutrino is predicted to have a mass around $$10^{14}$$
10
14
$$\mathrm{GeV}$$
GeV
to meet the current cosmological observations. Such a small value of $$\xi $$
ξ
can be realized by the Higgsportal coupling $$\lambda _{SH}\simeq 0.32$$
λ
SH
≃
0.32
and the vacuum expectation value of the additional neutral scalar $$\langle \phi \rangle \simeq 2.7$$
⟨
ϕ
⟩
≃
2.7
TeV, which correspond to the dark matter mass 2.0 TeV, its spinindependent cross section $$1.8\times 10^{9}$$
1.8
×
10

9
pb, and the mass of additional neutral scalar 190 GeV.