How can dark matter particles (WIMP's) get ever more densely clumped during the evolution of the universe, as we see for example in the Millennium simulation, if they can't loose kinetic energy by emitting radiation?
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3This question has an answer here: http://physics.stackexchange.com/q/174977/ – pela Apr 29 '15 at 06:58
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2Hi Chris. Kyle has posted a very nice description of this in the question I've linked. Even particles that interact only by gravity can clump. Google for dynamical friction for more background. – John Rennie Apr 29 '15 at 07:00