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to an extraordinarily high degree of precision — the technical term for that is “fine tuning.”) Naturalness, to physicists, cheap jordans free shipping , means no (or very little) fine tuning. A nice historical illustration of this concept comes from Jonathan Feng, of the University of California, Irvine, cheap air jordans , in a recent article in the Annual Review of Nuclear and Particle Science. It turns out that Isaac Newton himself articulated the meaning of naturalness in response to a question about how the universe could be static. (In those days, cheap jordans online , nobody knew the universe was expanding.) If all masses attracted, cheap real jordans , why wouldn’t everything in the universe be moving closer and closer together? Newton replied that it was indeed a very unnatural state of affairs. A mass would have to be placed precisely at the center of all other masses, attracted equally in all directions, cheap Authentic jordans , to remain motionless. Achieving such a state, Newton said, cheap jordans for sale , would be “fully as hard as to make the sharpest needle stand upright on its point upon a looking-glass.” Newton’s solution was to suppose that some divine power had established the precisely proper (and finely tuned) initial conditions to sustain a static infinite universe. But that was a supernatural explanation, not a natural one. In the Higgs case, a prime candidate for a natural explanation was supersymmetry, cheap jordan shoes , aka SUSY. SUSY adds a new set of subatomic particles into the mix, cheap wholesale jordans , one superpartner for each previously known particle. When the presence of the superparticles is accommodated in the equations, the Higgs mass comes out just right — SUSY required it http://watchmyswing.net/./node/5#comment-221404 http://www.2epub.net/node/add/article http://www.siempreluce...p;view=article&id=115 |