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Angular momentum of matter halos?
How much momentum (or more specifically, angular momentum) could a matter halo (like a dark matter halo, a neutrino halo...) have? Is it possible that they may have high amounts of momentum?
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Why do we need hot dark matter?
Data on galaxy rotation curves suggested that not all the mass in the galaxy is accounted for and we can't observe them directly but remind me again why we need hot dark matter in the first place? ...
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