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arXiv 2602.22977cond-mat.softcond-mat.stat-mechmath.DG
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封闭弹性曲线上的相分离与几何耦合:自由能最小化与动力学

Coupling between Phase Separation and Geometry on a Closed Elastic Curve: Free Energy Minimization and Dynamics

DAMTP, University of Cambridge(剑桥大学应用数学与理论物理系)

Hanchun Wang, Ronojoy Adhikari, Michael E. Cates

AI总结:

研究封闭弹性丝线上相分离与几何耦合的自由能景观与动力学,发现闭合约束定性改变自由能景观,通过全局自由能最小化探索平衡形态。

摘要:

我们研究封闭弹性丝线(二维中的一维曲线)与标量浓度场(例如代表吸附物质)耦合的自由能和动力学。密度变量倾向于相分离,而局部自发曲率依赖于浓度。我们通过解析和模拟处理自由能景观和动力学(后者包括封闭丝线完整微分几何上的耦合Willmore流和Cahn-Hilliard梯度流),解决了以往工作通常通过限制在Monge规范下回避的问题。具体地,我们发现可变形丝线的闭合约束与刚性封闭丝线或开放弹性丝线相比,定性改变了自由能景观,允许存在多于一种类型的亚稳态和稳态。通过数值全局自由能最小化,我们探索了广泛模型参数下的平衡形态。对于选定的参数值,我们展示了完全动力学结果,跟踪自由能各贡献的时间演化,并确认了亚稳态和平衡多域形态的出现。

英文摘要:

We study the free energy and dynamics of a closed elastic filament (a one-dimensional curve in two dimensions) coupled to a scalar concentration field representing, for example, an absorbed species. The density variable has a tendency to phase-separate whereas the local spontaneous curvature is concentration-dependent. We address analytically and by simulation both the free energy landscape and the dynamics (the latter comprising a coupled Willmore flow and Cahn--Hilliard gradient flow on the full differential geometry of a closed filament), addressing issues that previous work typically sidestepped by restricting to the Monge gauge. Specifically we find that the closure constraint for a deformable filament qualitatively changes the free energy landscape compared with either a rigid closed filament or an open elastic one, admitting metastable and stable states with more than one domain of each type. By numerical global free energy minimization we explore equilibrium morphologies across a wide range of model parameters. For selected parameter values we present fully dynamical results, tracking the time evolution of the various contributions to the free energy and confirming the emergence of both metastable and equilibrium multi-domain morphologies.

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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