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arXiv 0705.1250cond-mat.stat-mech
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横向剪切流动下Rouse高分子链的持久性

Persistence of a Rouse polymer chain under transverse shear flow

Somnath Bhattacharya, Dibyendu Das, Satya N. Majumdar

摘要:

我们考虑一个单一的Rouse聚合物链在二维存在的横向剪切流沿$x$方向和计算的持久性概率$P_0(t)$的$x$坐标的珠在大部分的链不返回到其初始位置的时间$t$。我们发现,持久性衰减后期的幂律,$P_0(t)\sim t^{-θ}$与非平凡的指数$θ$。使用独立的区间近似得到的$θ=0.359...$的分析估计与数值$θ\approx 0.360\pm 0.001$非常一致。

英文摘要:

We consider a single Rouse polymer chain in two dimensions in presence of a transverse shear flow along the $x$ direction and calculate the persistence probability $P_0(t)$ that the $x$ coordinate of a bead in the bulk of the chain does not return to its initial position up to time $t$. We show that the persistence decays at late times as a power law, $P_0(t)\sim t^{-θ}$ with a nontrivial exponent $θ$. The analytical estimate of $θ=0.359...$ obtained using an independent interval approximation is in excellent agreement with the numerical value $θ\approx 0.360\pm 0.001$.

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