arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2107.07205cond-mat.stat-mechastro-ph.HEcond-mat.softhep-thphysics.plasm-ph
收藏

由粒子浴拉格朗日量导出的相对论朗之万方程

Relativistic Langevin Equation derived from a particle-bath Lagrangian

Aleksandr Petrosyan, Alessio Zaccone

摘要:

我们展示了如何从洛伦兹协变的卡尔代拉-莱格特粒子浴拉格朗日方程的相对论朗之万方程。在其限制之一,我们确定所获得的方程与郎之万方程中使用的当代扩展的统计力学的近光速运动的布朗粒子在非相对论性耗散流体。所提出的框架提供了一个更严格的和第一原理的形式,朗之万方程经常引用或假设在以前的作品中的ananterior。然后,我们通过考虑粒子浴耦合中的更多项来改进上述结果,这提高了完全相对论设置的近似精度,其中不仅标记粒子而且热浴运动也是相对论的。我们讨论了时空平移和宇称不变性的明显破坏的含义,表明这些影响不一定与统计力学的假设相矛盾。本文还讨论了完全相对论性的广义朗之万方程的内在非马尔可夫性质以及相应的涨落耗散定理。

英文摘要:

We show how a relativistic Langevin equation can be derived from a Lorentz-covariant version of the Caldeira-Leggett particle-bath Lagrangian. In one of its limits, we identify the obtained equation with the Langevin equation used in contemporary extensions of statistical mechanics to the near-light-speed motion of a Brownian particle in non-relativistic dissipative fluids. The proposed framework provides a more rigorous and first-principles form of the Langevin equation often quoted or postulated as ansatz in previous works. We then refine the aforementioned results by considering more terms in the particle-bath coupling, which improves the precision of the approximation for fully relativistic settings where not only the tagged particle but also the thermal bath motion is relativistic. We discuss the implications of the apparent breaking of space-time translation and parity invariance, showing that these effects are not necessarily in contradiction with the assumptions of statistical mechanics. The intrinsically non-Markovian character of the fully relativistic generalized Langevin equation derived here, and of the associated fluctuation-dissipation theorem, is also discussed.

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。

↑