Removing singularities

Shmuel Elitzur, Amit Giveon, Eliezer Rabinovici
2003 Journal of High Energy Physics  
Big bang/crunch curvature singularities in exact CFT string backgrounds can be removed by turning on gauge fields. This is described within a family of SL(2)xSU(2)xU(1)_x/U(1)xU(1) quotient CFTs. Uncharged incoming wavefunctions from the "whiskers" of the extended universe can be fully reflected if and only if a big bang/crunch curvature singularity, from which they are scattered, exists. Extended BTZ-like singularities remain as long as U(1)_x is compact.
doi:10.1088/1126-6708/2003/01/017 fatcat:4d47xsahcjb4fidadolxs3ypuu