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RE: Using the Sun as a probe for dark matter
Well, neutrinos exist for sure. For dark matter, it is less sure (as said elsewhere, there are theoretical options in which there is no dark matter). Here, the interesting part is to use neutrino experiments to constrain dark matter models. We have a dark matter experiment for free, in some sense ;)
Oh, geez. I'm such an idiot! of course, neutrinos exist. I was trying to mean high energy neutrinos that as evidence would support the hypothesis of resulting from dark matter annihilation. I was lazy and said something dumb, didn't realize until I read your response. Yeah, the "free" part is also cool.
I answered something... and my answer disappeared! Damned....
So, I was saying that we have actually results on this. High-energy neutrino data is analyzed, and we have not found any sign of dark matter in it. As a result, we can only constrain dark matter models. It is not as exciting as a discovery, but still, we can learn something from that :)