arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1706.04849cond-mat.stat-mech
收藏

多自由度热输运精确可解模型的能量交换中相关性的缺失

Absence of correlations in the energy exchanges of an exactly solvable model of heat transport with many degrees of freedom

Thomas Gilbert

摘要:

基于完全可解的Kipnis-Marchioro-Presutti热传导模型的过程[J. Stat. Phys.2765(1982)]中描述,由此晶格单元在许多相同的自由度之间共享它们的能量,而在每个单元中,它们中的仅两个与连接相邻单元的能量交换相关联。它表明,直到尺寸常数,热传导率是一半的相互作用速率,无论自由度。此外,随着这个数字变大,参与交换的能量变量之间的相关性消失了。在这种情况下,该过程因此归结为由离散热方程规定的局部温度的时间演化。

英文摘要:

A process based on the exactly solvable Kipnis--Marchioro--Presutti model of heat conduction [J. Stat. Phys. 27 65 (1982)] is described whereby lattice cells share their energies among many identical degrees of freedom while, in each cell, only two of them are associated with energy exchanges connecting neighbouring cells. It is shown that, up to dimensional constants, the heat conductivity is half the interaction rate, regardless of the degrees of freedom. Moreover, as this number becomes large, correlations between the energy variables involved in the exchanges vanish. In this regime, the process thus boils down to the time-evolution of the local temperatures which is prescribed by the discrete heat equation.

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。

↑