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Are neutrinos affected by gravity?

If not, could that be a plausible reason for a neutrino taking a shorter path than light, since light is affected by gravity?

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Everything is affected by gravity. Gravity warps of space-time according to the Einstein Field Equations, and traveling on "geodesics" (shortest path curves) on that curved surface is how gravity is manifested.

Thinking as though there is some sort of euclidean space underneath the non-euclidean space-time in which neutrinos can take a more direct "straight line" between the points is not at all supported. Everything we know of travels on this curved spacetime.

Also, speaking more Newtonianly, neutrinos do seem to have mass in the more classic sense.

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Actually, it's interesting to ask what is the level of precision that the equivalence principle has been tested for neutrinos. The classic Eötvös experiments clearly puts some pretty strong bounds on essentially everything, since protons and neutrons are almost entirely "virtual" so gets contributions to its energy-momentum tensor from all sorts of fields. But what exactly is the contribution from the neutrino field (i.e. the part of the electroweak doublet)? How does this translate into actual bounds on the physical particle? I think this is a good and well-motivated question. – genneth Sep 30 '11 at 17:55
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@genneth: I wonder if anyone has done the equivalent of the semi-famous neutron potential shift experiment with neutrinos. – Jerry Schirmer Sep 30 '11 at 18:42

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