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arXiv 1102.2796nlin.CDmath-phmath.MP
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关于多体哈密顿系统的Kolmogorov-Sinai熵

On the Kolmogorov-Sinai entropy of many-body Hamiltonian systems

Arul Lakshminarayan, Steven Tomsovic

摘要:

Kolmogorov-Sinai(K-S)熵是复杂性和混沌的核心度量。它的计算多体系统是一个有趣的和重要的挑战。在本文中,评价制定考虑$N$维辛映射和推导的稳定性问题的转移矩阵形式主义。这种方法使得明确的对偶关系,这是完全类似于一个广义安德森紧束缚模型中发现的,并导致一个正式的精确表达的有限时间K-S熵。在这种形式主义中,有一个近似的层次,最后一个是对角近似,它只利用势的瞬时海森来找到K-S熵。通过一个非平凡的例子,研究了$N$同耦反冲转子(标准映射)的K-S熵。踢强度,粒子数和时间的各种近似的有效性得到阐明。在对角近似下,导出了K-S熵的解析公式,并探讨了它的适用范围。

英文摘要:

The Kolmogorov-Sinai (K-S) entropy is a central measure of complexity and chaos. Its calculation for many-body systems is an interesting and important challenge. In this paper, the evaluation is formulated by considering $N$-dimensional symplectic maps and deriving a transfer matrix formalism for the stability problem. This approach makes explicit a duality relation that is exactly analogous to one found in a generalized Anderson tight-binding model, and leads to a formally exact expression for the finite-time K-S entropy. Within this formalism there is a hierarchy of approximations, the final one being a diagonal approximation that only makes use of instantaneous Hessians of the potential to find the K-S entropy. By way of a non-trivial illustration, the K-S entropy of $N$ identically coupled kicked rotors (standard maps) is investigated. The validity of the various approximations with kicking strength, particle number, and time are elucidated. An analytic formula for the K-S entropy within the diagonal approximation is derived and its range of validity is also explored.

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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