Hp. Nilles et M. Spalinski, GENERALIZED STRING COMPACTIFICATIONS WITH SPONTANEOUSLY BROKEN SUPERSYMMETRY, Physics letters. Section B, 392(1-2), 1997, pp. 67-76
The Narain lattice construction of string compactifications is general
ized to include spontaneously broken supersymmetry. Consistency condit
ions from modular invariance and Lorentz symmetry are solved in full g
enerality. This framework incorporates models where supersymmetry brea
king is inversely proportional to the radii of compact dimensions. The
enhanced lattice description, however, might allow for models with a
different geometrical or even non-geometrical interpretation.