A physicist investigating black holes has found that, in an expanding universe, Einstein's equations require that the rate of the universe's expansion at the event horizon of every black hole must be ...
Proceedings of the National Academy of Sciences of the United States of America, Vol. 106, No. 34 (Aug. 25, 2009), pp. 14213-14218 (6 pages) We derive a system of three coupled equations that ...
The Navier-Stokes equations capture in a few succinct terms one of the most ubiquitous features of the physical world: the flow of fluids. The equations, which date to the 1820s, are today used to ...
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