In this article a simple model for the mixing of ordinary photon and its dark variants is proposed. Due to the transformations between different values of heff/h0=n during propagation, mass squared eigenstates are mixtures of photons with various values of n. An the analog of CKM matrix describing the mixing is proposed. Also the model for neutrino oscillations is generalized so that it applies - not only to photons - but to all elementary particles. The condition that "ordinary" photon is essentially massless during propagation forces to assume that during propagation photon is mixture of ordinary and dark photons, which would be both massive in absence of mixing. A reduction to ordinary photon would take place in the interaction vertices and therefore also in the absorption. The mixing provides a new contribution to particle mass besides that coming from p-adic thermodynamics and from the Kähler magnetic fields assignable to the string like object associated with the particle.
See the article The analogs of CKM mixing and neutrino oscillations for particle and its dark variants or the chapter
Quantum criticality and dark matter.
For a summary of earlier postings see Latest progress in TGD.