Impact of inert higgsino dark matter

We consider a recently proposed supersymmetric radiative seesaw model which is coupled with the minimal supergravity. The conventional R parity and Z2 invariance are imposed, which ensures the existence of a multi-component dark matter system. We assume that the pair of the lightest neutralino χ˜ and the fermionic component ξ˜ of the inert Higgs supermultiplet is dark matter. If ξ˜ is lighter than χ˜, and the lightest neutral inert Higgs boson is kinematically forbidden to decay (third dark matter), the allowed region in the m0-M1/2 plane increases considerably, where m0 and M1/2 are the universal soft-supersymmetry-breaking scalar and gaugino mass, respectively, although the dominant component of the multi-component dark matter system is χ˜. There is a wide allowed region above the recent LHC limit.