Inspired by Sheldon's submission of this paper, I did literature research today on the use of statistical (averaged) weak lensing in constraining fundamental parameters of the dark sector. I decided that statistical weak lensing has shown us that dark matter halos exist around galaxies and groups and clusters with the masses, sizes, and radial profiles one would expect, at least on average. It is not a precise tool—because of the averaging—but it does bolster the dominant paradigm.
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