VORTICES ON THE STRING AND SUPERSTRING WORLD SHEETS
Alexei A. Abrikosov, Ya.I. Kogan · International Journal of Modern Physics A · 1991
The world-sheet dynamics of the first quantized string propagating in nonsimply connected space is considered. Presence of the vortices on the world sheet leads to Berezinsky-Kosterlitz-Thouless (BKT) phase transition. Bosonic and superstring cases are discussed. It is shown that Hagedorn transition can be described as BKT transition both in bosonic and superstring cases.