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arXiv 1004.2225math.APcond-mat.stat-mechmath-phmath.MPmath.PR
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有界区间上Burgers方程的作用泛函与拟势

Action functional and quasi-potential for the Burgers equation in a bounded interval

Lorenzo Bertini, Alberto De Sole, Davide Gabrielli, Giovanni Jona-Lasinio, Claudio Landim

摘要:

考虑具有非齐次Dirichlet边界条件$u(t,0) = ρ_0$,$u(t,1) = ρ_1$的粘性Burgers方程$u_t + f(u)_x = ε\, u_{xx}$在区间$[0,1]$上的解.通量$f$是函数$f(u)= u(1-u)$,$ε>0$是粘度,并且边界数据满足$0<ρ_0<ρ_1<1$。我们研究了准势对应的行动功能,所产生的非平衡统计力学模型,与上述方程。我们提供了一个静态的变分公式的拟势和动力学问题的最佳路径的特征。与以前的情况相比,对于足够小的粘性,定义准势的变分问题允许多个极小元。这种现象被解释为非平衡相变,对应于准势的超微分不是单态的点。

英文摘要:

Consider the viscous Burgers equation $u_t + f(u)_x = ε\, u_{xx}$ on the interval $[0,1]$ with the inhomogeneous Dirichlet boundary conditions $u(t,0) = ρ_0$, $u(t,1) = ρ_1$. The flux $f$ is the function $f(u)= u(1-u)$, $ε>0$ is the viscosity, and the boundary data satisfy $0<ρ_0<ρ_1<1$. We examine the quasi-potential corresponding to an action functional, arising from non-equilibrium statistical mechanical models, associated to the above equation. We provide a static variational formula for the quasi-potential and characterize the optimal paths for the dynamical problem. In contrast with previous cases, for small enough viscosity, the variational problem defining the quasi potential admits more than one minimizer. This phenomenon is interpreted as a non-equilibrium phase transition and corresponds to points where the super-differential of the quasi-potential is not a singleton.

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