The Nature of Dark Matter
Problem statement
Galactic rotation curves stay flat, $v(r) \approx \text{const}$, far beyond the visible mass, and gravitational lensing plus the CMB power spectrum all point to roughly five times more non-luminous matter than baryonic matter.
What is dark matter made of? Candidates range from WIMPs and axions to primordial black holes — or is it instead a sign that gravity is modified on galactic scales?
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