Universality classes of the Kardar-Parisi-Zhang equation
L. Canet, M. A. Moore
Abstract
We re-examine mode-coupling theory for the Kardar-Parisi-Zhang (KPZ) equation in the strong coupling limit and show that there exists two branches of solutions. One branch (or universality class) only exists for dimensionalities d<dc=2 and is similar to that found by a variety of analytic approaches, including replica symmetry breaking and Flory-Imry-Ma arguments. The second branch exists up to dc=4 and gives values for the dynamical exponent z similar to those of numerical studies for d2.
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