The Valididy of the Langevin Equation

Details The Valididy of the Langevin Equation The Valididy of the Langevin Equation

2011-02-13

arxiv.org/abs/1102.2610v2

Physics

Condensed Matter

Other Condensed Matter

Revised version is available

Scientific paper

The validity of the Langevin equation (both classical and quantum) is studied in cases when not all the equations of motion are linear. In particular, a model is studied in which the interaction is bilinear in the environment variables. We conclude that the equation is valid only for frequencies close to the frequency of the system alone. If the equation of motion of the system alone is nonlinear, we are unable to find a condition for the validity of the Langevin equation.

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