Compactification of M(atrix) theory on noncommutative toroidal orbifolds
arXiv:hep-th/9912185 · doi:10.1016/S0550-3213(00)00544-7
Abstract
It was shown by A. Connes, M. Douglas and A. Schwarz that noncommutative tori arise naturally in consideration of toroidal compactifications of M(atrix) theory. A similar analysis of toroidal Z_{2} orbifolds leads to the algebra B_θ that can be defined as a crossed product of noncommutative torus and the group Z_{2}. Our paper is devoted to the study of projective modules over B_θ (Z_{2}-equivariant projective modules over a noncommutative torus). We analyze the Morita equivalence (duality) for B_θ algebras working out the two-dimensional case in detail.
19 pages, Latex; v2: comments clarifying the duality group structure added, section 5 extended, minor improvements all over the text