Non-Compact Calabi-Yau Spaces and Other Non-Trivial Backgrounds for 4-D Superstrings

E. Kiritsis, C. Kounnas, D. Lust

A large class of new 4-D superstring vacua with non-trivial/singular geometries, spacetime supersymmetry and other background fields (axion, dilaton) are found. Killing symmetries…