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One of the greatest mysteries in astrophysics and cosmology is the nature andthe origin of cold dark matter, which represents more than 84% of the mass inthe universe. Dark matter reacts on and produces gravitational forces andgoverns the dynamics of stars around galactic centres, however, does not absorbor emit any kind of electromagnetic radiation. So far, any relation to knowntypes of matter has not been conclusive, and proposed new particles have notbeen found. Here, I propose and discuss how dark matter evolved fromultra-light fermionic particles that decoupled from the rest of the universeshortly after the Big Bang. My description explicitly considers theirinterference, and reveals the emergence of entanglement between two suchparticles, as well as their transformation to massive dark-matter quantumfields of cosmic sizes. Furthermore, I argue that dark matter and supermassiveblack holes have the same origin and evolved simultaneously. If the particles'decoupling time was about half a second after the Big Bang, my hypothesispredicts a minimum mass for supermassive black holes that fits well to thesmallest known such object of 50,000 solar masses. It seems very much likelythat the ultra-light fermionic particle was the neutrino.

Hypothesis on the nature and origin of cold dark matter