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I'm starting to wonder whether it is a neutrino distribution that they've actually measured?
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Wondering whether it was neutrinos they were measuring, Craig. Could be, or maybe certain flavours of neutrinos have tachyon-like properties.
One of the properties of tachyons is the less energy they have the faster they go. So, for a tachyon that is traveling only a shade faster than light, the same horrible consequences of "infinite mass and energy" dog them. However, they behave in a gravitational field in exactly the same way as ordinary particles of matter do....since mass, whether it's imaginary or not, is still mass. In other words, they gain their mass in exactly the same way as ordinary matter, only it's mass is the mirror opposite of the mass of an ordinary particle.