Type IIA orientifolds and orbifolds on non-factorizable tori
arXiv:0712.2281 · doi:10.1016/j.nuclphysb.2008.01.030
Abstract
We investigate Type II orientifolds on non-factorizable torus with and without its oribifolding. We explicitly calculate the Ramond-Ramond tadpole from string one-loop amplitudes, and confirm that the consistent number of orientifold planes is directly derived from the Lefschetz fixed point theorem. We furthermore classify orientifolds on non-factorizable Z_N x Z_M orbifolds, and construct new supersymmetric Type IIA orientifold models on them.
42 pages, 3 figures, v2: typos corrected, references added, version to appear in Nucl. Phys. B