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Several rare coincidences of scales in standard particle physics are neededto explain (i) why neutrinos have mass, (ii) why the negative pressure of thecosmological dark energy (DE) coincides with the positive pressure of randommotion of dark matter (DM) in bright galaxies, (iii) why Dark Matter ingalaxies seems to have a finite phase-space density, and to follow theTully-Fisher-Milgrom relation of galaxy rotation curves. The old idea ofself-interacting DM is given a new spin: we propose that the neutrinospin-gravity coupling could lead to a cosmic neutrino dark fluid with a aninternal energy density varying as function of the local acceleration of theneutrino fluid with respect the CMB background. We link theTully-Fisher-Milgrom relation of spiral galaxies (or MOND) with therelativistic pressure of the neutrino dark fluid without modifying Einsteiniangravity.

Reinterpreting MOND: coupling of Einsteinian gravity and spin of cosmic neutrinos?