Orientifold Calabi-Yau Threefolds: Divisor Exchanges and Multi-Reflections

Xu Cao, Hongfei Gao, Xin Gao

Using the Kreuzer-Skarke database of 4-dimensional reflexive polytopes, we systematically constructed a new database of orientifold Calabi-Yau threefolds with $h^{1,1}(X)\le 12$.…