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arXiv 0901.2733cond-mat.stat-mechcond-mat.mtrl-sci
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增长区域上的随机增长方程

Stochastic growth equations on growing domains

Carlos Escudero

摘要:

研究了生长衬底上线性随机生长方程的动力学性质。假设衬底在时间上遵循幂律$t^γ$生长,其中生长指数$γ$是任意正数。两种不同的制度被清楚地确定:对于小$γ$的接口变得相关的,和动态是由扩散为主;对于大$γ$的接口保持不相关,和动态是由稀释为主。在该第二制度中,对于短的时间间隔和空间尺度,恢复对应于非生长衬底情况的临界指数。对于长时间差异或大空间尺度,情况则不同。大的空间尺度显示了生长界面的不相关特征。长时间间隔的自相关和持久性指数的装置进行了研究。很明显,在第二种情况下,稀释是相关性传播的机制。

英文摘要:

The dynamics of linear stochastic growth equations on growing substrates is studied. The substrate is assumed to grow in time following the power law $t^γ$, where the growth index $γ$ is an arbitrary positive number. Two different regimes are clearly identified: for small $γ$ the interface becomes correlated, and the dynamics is dominated by diffusion; for large $γ$ the interface stays uncorrelated, and the dynamics is dominated by dilution. In this second regime, for short time intervals and spatial scales the critical exponents corresponding to the non-growing substrate situation are recovered. For long time differences or large spatial scales the situation is different. Large spatial scales show the uncorrelated character of the growing interface. Long time intervals are studied by means of the auto-correlation and persistence exponents. It becomes apparent that dilution is the mechanism by which correlations are propagated in this second case.

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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