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arXiv 1012.2594cond-mat.stat-mech
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哈密顿平均场动力学中的自洽非均匀定态

Self-consistent inhomogeneous steady states in Hamiltonian mean field dynamics

Pierre de Buyl, David Mukamel, Stefano Ruffo

摘要:

长寿命的准稳态,与固定稳定的解决方案的弗拉索夫方程,被发现在系统中的长程相互作用。对在环上运动的全局耦合粒子的模型--哈密顿平均场模型(HMF)的弛豫时间的研究表明,对于大的$N$,弛豫时间发散为$N^γ$,对于粒子均匀分布的某些初始条件,弛豫时间发散为$γ\simeq 1.7$。我们提出了一种方法,用于确定精确的非均匀的热力学极限的稳定状态,分析模型的基础上,非耦合粒子在外场中移动。对于HMF模型,我们数值计算表明,这些状态的弛豫时间发散与$N$指数$γ\simeq 1$。该方法,适用于其他模型与全球耦合粒子,也允许一个准确的评估的稳定性极限均匀的稳态。在某些情况下,它为初始条件和最终稳态之间的对应关系提供了一个很好的近似。

英文摘要:

Long-lived quasistationary states, associated with stationary stable solutions of the Vlasov equation, are found in systems with long-range interactions. Studies of the relaxation time in a model of $N$ globally coupled particles moving on a ring, the Hamiltonian Mean Field model (HMF), have shown that it diverges as $N^γ$ for large $N$, with $γ\simeq 1.7$ for some initial conditions with homogeneously distributed particles. We propose a method for identifying exact inhomogeneous steady states in the thermodynamic limit, based on analysing models of uncoupled particles moving in an external field. For the HMF model, we show numerically that the relaxation time of these states diverges with $N$ with the exponent $γ\simeq 1$. The method, applicable to other models with globally coupled particles, also allows an exact evaluation of the stability limit of homogeneous steady states. In some cases it provides a good approximation for the correspondence between the initial condition and the final steady state.

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