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arXiv 2210.07099cond-mat.softcond-mat.stat-mech
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类RNA聚合物与双聚合物的普适类

A universality class for RNA-like polymers and double polymers

Richard Dengler

AI总结:

本研究从$O(n)$对称自旋模型推导类RNA双聚合物的场论,发现稳定重整化群不动点及8维临界维数,揭示单双链聚合物的解耦行为与各自临界特性。

摘要:

我们研究了溶剂中线性聚合物的构象统计,这类聚合物可形成双聚合物结构。我们严格遵循经典方法,从$O(n)$对称自旋模型推导出该问题的场论,该场论是描述每个单体具有恒定结合能的RNA或DNA的模型。研究表明存在一个稳定的重整化群不动点,在该不动点处,双聚合物与单链聚合物解耦,并成为具有三点相互作用的传统类型支化聚合物。要达到该不动点,至少需要调整一个参数,其临界维数为8。在此极限下,费希尔重整化(Fisher-renormalization)、状态方程和临界指数均可重现。单链聚合物依赖于双链聚合物并在临界点处消失,但具有自身的临界指数。

英文摘要:

We examine the statistics of conformations of a linear polymer in a solvent. The polymer is allowed to form double polymers. We closely follow a classical technique to derive a field theory for the problem from an $O\left(n\right)$ symmetric spin model. The field theory is a model for RNA or DNA with constant binding energy per monomer. It is shown that there is a stable renormalization group fixed point, at which the double polymer decouples from the single-strand polymer and becomes a branched polymer of the conventional type with a three-point interaction. To reach this fixed point, at least one parameter must be adjusted. The critical dimension is eight. Fisher-renormalization, equation of state and critical exponents are reproduced in this limit. The single-strand polymer depends on the double-strand polymer and disappears at the critical point, but has its own critical exponents.

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