From: Sam Wormley on 3 May 2010 23:10 What black holes teach about strongly coupled particles http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_63/iss_5/29_1.shtml?type=PTALERT&bypassSSO=1 Classical systems with strongly interacting particles can, in principle, have zero viscosity. But string theory and experiment suggest that in the quantum world, the viscosity can be only so low.
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