String theory and experiment suggest that in the quantum world, the viscosity can be only so low
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From: john on 4 May 2010 11:16 On May 3, 9:10 pm, Sam Wormley <sworml...(a)gmail.com> wrote: > What black holes teach about strongly coupled particles > > http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_63/iss_5/29_1.shtm... > > 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. "The calculation of how a disturbance propagates from one place to another in the gauge theory may be recast as a calculation in which gravitons from a point on the boundary propagate in the higher-dimensional bulk theory, scatter off a black hole, and return to another point on the boundary" Where did the gravitons come from? How were they made? Why would they 'scatter off a black hole'? What does 'return to another point on the boundary' refer to? What part do they play in the process? What *is* the process? These guys know less than zero. john |