论文标题
恒密度群的亚竞争性
Metastability of Constant-Density Flocks
论文作者
论文摘要
我们从数值上研究了碳-TU场理论，其中密度场保持恒定，这是“ Malthusian”羊群的极限情况，在该群体中，相关函数在顺序阶段的渐近缩放量表完全已知。虽然我们确认这些缩放定律，但我们还表明，这种恒定密度的植物与特定缺陷构型的成核具有亚稳定性，并由全球无序相位的相位，由紫色的相位，由紫色的紫外线组成，这些紫色被冲击线包围，这些冲击线不断地演变和重塑本身。我们证明，疾病的主要来源是沿冲击线，使这种活跃的泡沫与相应的平衡系统根本不同。因此，我们表明，在主动物质的背景下，在扰动理论的所有顺序上获得的结果都可以被非扰动效应所取代，要求采取不同的方法。
We study numerically the Toner-Tu field theory where the density field is maintained constant, a limit case of "Malthusian" flocks for which the asymptotic scaling of correlation functions in the ordered phase is known exactly. While we confirm these scaling laws, we also show that such constant-density flocks are metastable to the nucleation of a specific defect configuration, and are replaced by a globally disordered phase consisting of asters surrounded by shock lines that constantly evolves and remodels itself. We demonstrate that the main source of disorder lies along shock lines, rendering this active foam fundamentally different from the corresponding equilibrium system. We thus show that in the context of active matter also, a result obtained at all orders of perturbation theory can be superseded by non-perturbative effects, calling for a different approach.
