Effective Action and Field Equation for BEC from Weak to Strong
Couplings [PDF]
H. KleinertWhile free and weakly interacting nonrelativistic particles are described by a Gross-Pitaevskii equation, which is a nonlinear self-interacting Schr\"odinger equation, the phenomena in the strong- coupling limit are governed by an effective action that is extremized by a double-fractional generalization of this equation. Its particle orbits perform L\`evy walks rather than Gaussian random walks.View original: http://arxiv.org/abs/1307.4547
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