FrediFizzx wrote:Yablon wrote:...
In a cosmological setting, neutrinos would seek out regions to cluster amongst themselves, and all other particles would cluster amongst themselves, with segregation between the neutrinos and everything else. We know that the other particles are heavily concentrated in stars and planets and galaxies, so we have to presume that the neutrinos congregate in interstellar and intergalactic space. And given that a neutrino can pass through the entire earth, they certainly don’t seem to want to have anything to do with us.
So what if the neutrinos in intergalactic space, because they are repelling the main matter of the galaxies, are forcing the galaxies to appear to be more tightly gravitating than they actually are. In other words, suppose what is holding the galaxies together better than we expect and therefore making us think that we require dark matter is not an attractive force within the galaxies, but a repulsive force coming from the neutrinos congregated outside the galaxies as far as they can get away from regular matter. A push rather than a pull. Then perhaps we don’t need the dark matter anymore, because the real problem is that we have missed the boat on the actual way in which neutrinos gravitate. ...
Jay, this sounds to me like a description of dark energy not dark matter. If the Universe is full of anti-grav neutrinos, it could be what is causing the accelerated expansion. After all, the stars are making more neutrinos all the time. How many of those neutrinos are being destroyed? Probably not many. Of course if this is the case, then it is not really "dark" at all.
After more study, apparently there is not enough energy in all the neutrinos to account for dark energy even if they are anti-grav. Unless the calculation is wrong for some reason. If correct, then there would need to be another anti-grav particle which is heavy enough to account for dark energy. Perhaps a so-called sterile neutrino that only interacts gravitationally. Our
theory could allow for a heavy "sterile" neutrino with anti-grav properties. Perhaps tordions are composites of such a neutrino and its anti-particle. Not sure yet if this works in SU(8) symmetry. These particles would congregate away from matter and most likely be impossible to detect by means other than gravitation.
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