N=2 Strings on Orbifolds
arXiv:hep-th/0503043 · doi:10.1088/1126-6708/2005/08/008
Abstract
We study closed N=2 strings on orbifolds of the form T^4/Z_2 and C^2/Z_2. We compute the torus partition function and prove its modular invariance. We analyse the BRST cohomology of the theory, construct the vertex operators, and compute three and four point amplitudes of twisted and untwisted states. We introduce a background of D-branes, and compute twist states correlators.
43 pages with no figures; structural changes; ref. added; target-space picture clarified