Complex Structure of the Four-Dimensional Kerr Geometry: Stringy System, Kerr Theorem, and Calabi-Yau Twofold

Figure 3

Ends of the open complex string, associated with quantum numbers of quark-antiquark pair, are mapped onto the real half-infinite 𝑧⁺,𝑧⁻ axial strings. Dotted lines indicate orientifold projection.