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arXiv math-ph/0703014math-phmath.MP
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声子玻尔兹曼方程平衡态的逼近

Approach to equilibrium for the phonon Boltzmann equation

Jean Bricmont, Antti Kupiainen

摘要:

研究了描述晶格中经典相互作用非谐振子动力学极限的玻尔兹曼方程解的渐近性。我们证明了,如果初始条件是一个小扰动的平衡态,并在无穷远处消失,动力学扩散趋于平衡。解是局部平衡态的总和,与扩散到零的守恒量有关,而快变量则从属于慢变量。这种从属关系意味着傅立叶定律,它将感应电流与守恒量的梯度联系起来。

英文摘要:

We study the asymptotics of solutions of the Boltzmann equation describing the kinetic limit of a lattice of classical interacting anharmonic oscillators. We prove that, if the initial condition is a small perturbation of an equilibrium state, and vanishes at infinity, the dynamics tends diffusively to equilibrium. The solution is the sum of a local equilibrium state, associated to conserved quantities that diffuse to zero, and fast variables that are slaved to the slow ones. This slaving implies the Fourier law, which relates the induced currents to the gradients of the conserved quantities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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