Orientifold Calabi-Yau threefolds with divisor involutions and string landscape

  title={Orientifold Calabi-Yau threefolds with divisor involutions and string landscape},
  author={Ross Altman and Jonathan Carifio and Xin Gao and Brent Nelson},
  journal={Journal of High Energy Physics},
Abstract We establish an orientifold Calabi-Yau threefold database for h1,1(X) ≤ 6 by considering non-trivial ℤ2 divisor exchange involutions, using a toric Calabi-Yau database (www.rossealtman.com/tcy). We first determine the topology for each individual divisor (Hodge diamond), then identify and classify the proper involutions which are globally consistent across all disjoint phases of the Kähler cone for each unique geometry. Each of the proper involutions will result in an orientifold… 
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