Probability Theory and Related Fields

, Volume 135, Issue 3, pp 363–394 | Cite as

On the Smoluchowski-Kramers approximation for a system with an infinite number of degrees of freedom

  • Sandra Cerrai
  • Mark Freidlin
Article

Abstract

According to the Smolukowski-Kramers approximation, we show that the solution of the semi-linear stochastic damped wave equations μ u tt (t,x)=Δu(t,x)−u t (t,x)+b(x,u(t,x))+Q Open image in new window (t),u(0)=u 0, u t (0)=v 0, endowed with Dirichlet boundary conditions, converges as μ goes to zero to the solution of the semi-linear stochastic heat equation u t (t,x)=Δ u(t,x)+b(x,u(t,x))+Q Open image in new window (t),u(0)=u 0, endowed with Dirichlet boundary conditions. Moreover we consider relations between asymptotics for the heat and for the wave equation. More precisely we show that in the gradient case the invariant measure of the heat equation coincides with the stationary distributions of the wave equation, for any μ>0.

Key words or phrases

Smolukowski-Kramers approximation Stochastic semi-linear damped wave equations Stochastic semi-linear heat equations Stationary distributions Gradient systems Invariant measures 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Sandra Cerrai
    • 1
  • Mark Freidlin
    • 2
  1. 1.Dip. di Matematica per le DecisioniUniversità di FirenzeFirenzeItaly
  2. 2.Department of MathematicsUniversity of MarylandMarylandUSA

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