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We assume that the cold dark matter consists of spin-1/2 and spin-0 particlesdescribed by a bispinor field \psi and a scalar field \phi, sterile from allStandard Model charges (in contrast, neutralinos, supersymmetric candidates forcold dark matter, are not sterile from weak Standard Model charges). Wepropose, however, that such a sterile world can contact with our Standard Modelworld not only through gravity but also through a portal provided by photonscoupled to sterile particles by means of two very weak effective interactions-(f/M^2)\phi F^{\mu\nu}\phi F_{\mu\nu} and -(f'/M^2) (\bar\psi \sigma^{\mu\nu}\psi)\phi F_{\mu\nu}, where M is a very large mass scale and f and f' aredimensionless coupling constants. Thus, in our picture, the electromagneticfield F_{\mu\nu} - as the only Standard Model field - participates in bothworlds, providing a nongravitational link between them (other than the popularsupersymmetric weak interaction, active in the case of neutralinos). Inconsequence, there appears a tiny quasi-magnetic correction to the conventionalelectromagnetic current (described in Appendix A).

Photonic portal to the sterile world of cold dark matter