一个一维的高斯非马科夫可观测的时间依赖轨迹并没有揭示其不平衡性质
1Indian Institute of Science, Freie Universität Berlin, Fachbereich Physik, 144195 Berlin, Germany and Centre for Condensed Matter Theory, Department of Physics, Bangalore 560012, India.
在高斯系统中,通过观察单个轨迹,不可能区分平衡和不平衡状态. 即使对于非马科夫过程,一个相当的平衡系统也可以产生相同的相关函数.
科学领域:
- 统计力学 统计力学
- 非线性动力学是一种非线性动力学.
- 物理化学 物理化学
背景情况:
- 从实验或模拟中分析时间序列数据通常需要确定一个系统是否处于平衡状态.
- 一般化的朗格温方程描述了复杂系统中可观测的动态.
- 斯可观测值和非马科夫动力学在各种物理和生物系统中很常见.
研究的目的:
- 为了调查一个系统的平衡状态是否只能从一个一维高斯可观测的时间依赖轨迹中确定.
- 用可观测的统计性质来确定不平衡动态是否可以与平衡动态区分开来.
主要方法:
- 对一个高斯非马科夫可观测的非平衡的分析概括了朗格温方程.
- 调查多点联合分布和两点相关函数之间的关系.
- 不平衡过程与同等平衡过程的比较,这些过程具有相同的相关函数.
主要成果:
- 一个高斯可观测的多点联合分布完全取决于其两点相关函数.
- 对于任何不平衡过程,可以找到具有特定参数的平衡过程,从而产生相同的两点相关函数.
- 系统的不平衡性质不能从高斯可观测的单维轨迹中辨别出来,与其非马科维性不同.
结论:
- 该研究得出结论,通过观察一维高斯可观测的轨迹,无法区分平衡状态和不平衡状态.
- 这些发现对理解高斯速度分布的系统动态有意义,例如人类癌细胞和藻类细胞.
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