论文标题

活跃物质模型中的固定平价状态

Stationary broken parity states in active matter models

论文作者

Frohoff-Hülsmann, Tobias, Holl, Max Philipp, Knobloch, Edgar, Gurevich, Svetlana V., Thiele, Uwe

论文摘要

我们证明,通常用于描述活性物质以及其他活动系统的几种非不同连续模型都表现出非元素行为:每个模型都支持不对称但固定的局部状态,即使在没有固定性的情况下也没有固定。此外,随着活动的增加,这种状态只会在漂移转移分叉后开始漂移。不对称的固定状态只能存在于变异系统中,即具有梯度结构的模型中。换句话说,在被动系统中期望这种状态,但在模型的梯度结构被活动破坏的活动系统中没有。我们确定了这些模型的“虚假”梯度动力学结构,该结构是导致这种非肾上腺行为的原因,并确定了使模型通用的附加术语类型,即通过不对称的状态通过漂移 - 诉fork叉分叉出现并且通常移动。我们使用在通用和非统一案例中静止和稳定漂移状态的数值延续提供了详细的结果。

We demonstrate that several nonvariational continuum models commonly used to describe active matter as well as other active systems exhibit nongeneric behavior: each model supports asymmetric but stationary localized states even in the absence of pinning at heterogeneities. Moreover, such states only begin to drift following a drift-transcritical bifurcation as the activity increases. Asymmetric stationary states should only exist in variational systems, i.e., in models with gradient structure. In other words, such states are expected in passive systems, but not in active systems where the gradient structure of the model is broken by activity. We identify a "spurious" gradient dynamics structure of these models that is responsible for this nongeneric behavior, and determine the types of additional terms that render the models generic, i.e., with asymmetric states that appear via drift-pitchfork bifurcations and are generically moving. We provide detailed illustrations of our results using numerical continuation of resting and steadily drifting states in both generic and nongeneric cases.

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