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arXiv 2204.10992cond-mat.stat-mech
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一维Zhang沙堆模型中的能量涨落

Energy fluctuations in one dimensional Zhang sandpile model

Naveen Kumar, Suram Singh, Avinash Chand Yadav

摘要:

本文考虑了具有局部保守(或耗散)动力学的一维Zhang沙堆模型,考察了其在外部驱动时间尺度下的总能量涨落。体驱动系统导致洛伦兹谱,截止时间$T$随系统尺寸$L$线性增长。波动表现出$1/f^α$行为与$α\sim 1$的边界驱动,和截止时间非线性变化。对于保守的局部动力学,截止时间显示幂律增长$T \sim L^λ$,不同于非保守情况下观察到的指数形式$ \sim \exp(μL)$。我们认为局域耗散不是一维系统产生$1/f$噪声的必要因素,而截止时间可以揭示局域动力学的独特性质。我们还讨论了具有随机耗散的局部非保守动力学的能量涨落。

英文摘要:

We consider the Zhang sandpile model in one-dimension (1D) with locally conservative (or dissipative) dynamics and examine its total energy fluctuations at the external drive time scale. The bulk-driven system leads to Lorentzian spectra, with a cutoff time $T$ growing linearly with the system size $L$. The fluctuations show $1/f^α$ behavior with $α\sim 1$ for the boundary drive, and the cutoff time varies non-linearly. For conservative local dynamics, the cutoff time shows a power-law growth $T \sim L^λ$ that differs from an exponential form $ \sim \exp(μL)$ observed for the nonconservative case. We suggest that the local dissipation is not a necessary ingredient of the system in 1D to get the $1/f$ noise, and the cutoff time can reveal the distinct nature of the local dynamics. We also discuss the energy fluctuations for locally nonconservative dynamics with random dissipation.

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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