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arXiv 1306.4993cond-mat.stat-mech
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平面θ点聚合物与Schramm-Loewner演化

Theta-point polymers in the plane and Schramm-Loewner evolution

Marco Gherardi

摘要:

我们研究了在θ温度下的聚合物在晶格上和Schramm-Loewner链在连续介质中具有恒定步长的连接。后者实现了一个有用的算法的精确采样的三临界聚合物,其中有限链的影响被排除在外。通过径向实施的拉链方法从晶格模型计算的驱动函数收敛到布朗运动的扩散系数kappa=6的大倍。步行的内部部分的分布函数很好地近似由Schramm-Loewner链获得。相关长度nu的指数和在连续体中测量的标度指数的前导校正Δ_1与nu=4/7(预测为θ点)和Δ_1 =72/91(预测为渗流)相容。最后,我们计算了链的形状因子和非球面度,发现令人惊讶的符合θ点端到端的值。

英文摘要:

We study the connection between polymers at the theta temperature on the lattice and Schramm-Loewner chains with constant step length in the continuum. The latter realize a useful algorithm for the exact sampling of tricritical polymers, where finite-chain effects are excluded. The driving function computed from the lattice model via a radial implementation of the zipper method is shown to converge to Brownian motion of diffusivity kappa=6 for large times. The distribution function of an internal portion of walk is well approximated by that obtained from Schramm-Loewner chains. The exponent of the correlation length nu and the leading correction-to scaling exponent Delta_1 measured in the continuum are compatible with nu=4/7 (predicted for the theta point) and Delta_1=72/91 (predicted for percolation). Finally, we compute the shape factor and the asphericity of the chains, finding surprising accord with the theta-point end-to-end values.

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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