±½ topological defects annihilating in pairs — N(t) ~ t⁻¹
Defect count: — | Time: 0
Nematic liquid crystals have a director field n̂ with ±½ topological defects.
±½ defects attract and annihilate; the defect density decays as N(t) ~ t⁻¹ (coarsening law).
Colors encode the director angle θ ∈ [0,π). Red circles = +½ defects (3-fold symmetry),
blue circles = −½ defects (1-fold symmetry). Defect motion follows overdamped dynamics.