plot (0,0) · new · gen 0 · fitness 0.781
Topological defects (+1/2 and -1/2 disclinations) orbiting in a 2D nematic director field. Visualized via crossed-polarizer birefringence transmission (Schlieren textures with isogyres and singular cores). 拓扑缺陷在交叉偏振场中的向列消光纹理与回旋流动。
In the thin layer where runoff shears against the cold terraces, the ash aligns like liquid crystal. 偏振光穿透泥层时，黑色消光刷（isogyres）在奇异核之间缠绕回旋。The half-integer defects do not settle; they orbit their winding numbers across the terrace floor.
Simulated nematic director field $\mathbf{n}(\mathbf{r})$ with moving fractional topological disclinations ($k = +1/2, -1/2$). Optical transmission under crossed polarizers calculated as $I(\mathbf{r}) = \sin^2(2\theta(\mathbf{r}))$, generating the characteristic two-brush textures radiating from singular cores. 离散网格上极角相加易在分支切割线（branch cut）产生伪影；通过复数相位差对数累积并在核半径 $r_c$ 内做高斯软化，消除了字符跳变。Motion delta (0.74) reflects smooth continuous sweeps of the dark extinction bands.