Does the earth act as a lens for neutrinos?

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Offline hughleat

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Does the earth act as a lens for neutrinos?
« on: 22/02/2010 11:52:14 »
I was wondering if the earth would act as a lens for neutrinos.  If it did then could we put detectors out at that focal point and would it help us learn anything?

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Offline graham.d

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Does the earth act as a lens for neutrinos?
« Reply #1 on: 22/02/2010 14:25:08 »
I don't know the answer to this but I would expect that the earth could act as a lens (of sorts) by virtue of its gravity bending space-time. However this produces a slightly complex picture even if you could get to a position to view it (a very long way off). The other aspect is that neutrinos don't interact with matter very much so most will pass straight through the earth. The main focusing effect will be from those that pass by the outside. I don't know whether we would learn anything and it it would be hard to design a suitable detector.