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Condensation of classical nonlinear waves

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2005-12-31
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Connaughton, Colm
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Condensation of classical nonlinear waves
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  • Connaughton, Colm;
  • Josserand, Christophe;
  • Picozzi, Antonio;
  • Pomeau, Yves;
  • Rica, Sergio;
Abstract
We study the formation of a large-scale coherent structure (a condensate) in classical wave equations by considering the defocusing nonlinear Schrodinger equation as a representative model. We formulate a thermodynamic description of the classical condensation process by using a wave turbulence theory with ultraviolet cutoff. In three dimensions the equilibrium state undergoes a phase transition for sufficiently low energy density, while no transition occurs in two dimensions, in complete analogy with standard Bose-Einstein condensation in quantum systems. On the basis of a modified wave turbulence theory, we show that the nonlinear interaction makes the transition to condensation subcritical. The theory is in quantitative agreement with the numerical integration of the nonlinear Schrodinger equation.
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URI: https://repositorio.uchile.cl/handle/2250/124512
ISSN: 0031-9007
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PHYSICAL REVIEW LETTERS 95 (26): Art. No. 263901 DEC 31 2005
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