Center-Vortex Loops with One Self-Intersection

Figure 1

Points on the center flux lines moving oppositely on a line perpendicular to the bisecting line of the angle 𝛼 with velocity modulus 𝑣₁. For sufficiently small 𝛼 the velocity modulus 𝑣₂ of the intersection point is superluminal: 𝑣₂=𝑣₁cot(𝛼/2).