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arXiv 1508.04069cond-mat.stat-mechcond-mat.quant-gascond-mat.soft
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含时外势阱中气体的耗散

Dissipation in gases trapped in time-dependent external potentials

Markus Wenin

摘要:

研究了含时外囚禁势中的理想气体.本文利用带有弛豫时间的玻尔兹曼方程,研究了孤立孤立系的能量随时间的变化。特别是,我们感兴趣的耗散沿给定的协议与有限的速度在一个潜在的变化。作为一个限制的情况下,松弛少的演变的作用进行了研究:从平衡分布和小的时间与松弛的气体的能量总是小于的松弛-less. This意味着松弛过程表现出矛盾的行为:一方面熵生产,但另一方面减少耗散的驱动系统回到平衡。

英文摘要:

We investigate an ideal gas in a time--dependent external trapping potential. We use the Boltzmann equation with the relaxation time ansatz to explore the time--dependent energy of an adiabatically isolated system. In particular we are interested on the dissipation during a potential change along a given protocol with finite velocity. The role of the relaxation less evolution as a limiting case is studied: starting from an equilibrium distribution and for small times the energy of the gas with relaxation is always smaller than that of the relaxation--less. This means that relaxation processes show an ambivalent behavior: on the one hand entropy production, but on the other hand reduction of dissipation by driving back the system into equilibrium.

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