Non-thermal fluctuation and correlation of chaos in conservative systems

研究了混沌哈密顿系统的动力学和平衡性质。特别地，我们研究了链式系统，其中质量由刚性连杆或弹簧连接。对于由刚性连杆连接的质量系统，质量的平均动能在链的末端附近取过大的值。对于质量由弹簧连接的系统，两端附近的平均动能瞬时取过大的值。随着弹簧常数k的增大，达到均分的弛豫时间τ迅速增大。这与Boltzmann-Jeans理论中的表达式τ_exp（τ ^）是一致<ck>的。结果表明，链型系统，如聚合物，DNA，蛋白质，人造物体也显示出过剩的平均能量附近的链的两端。

Dynamical and equilibrium properties of chaotic Hamiltonian systems are investigated. In particular, we studied chain-type systems where masses are connected by rigid links or springs. For systems where masses are connected by rigid links, average kinetic energies of masses take excessive large values near the ends of chain. For systems where masses are connected by springs, average kinetic energies near the ends transiently take excessive values. The relaxation time to equipartitionτgrows rapidly with the increase of the spring constant k. It is in agreement with the expressionτ∝exp(√^<ck>) obtained from Boltzmann-Jeans theory. The results imply that chain-type systems such as polymers, DNA, protein, artificial objects also show excess average energy near ends of the chain.