Swampland conjectures and infinite flop chains by Brodie, CR, Constantin, A, Lukas, A, Ruehle, F

“…In cases where the infinite chain of Calabi-Yau manifolds involves only a finite number of isomorphism classes, the moduli space has an infinite discrete symmetry which relates the isomorphic manifolds connected by flops. …”

Aspects of string model building and heterotic/F-theory duality by Brodie, CR

“…We focus on the simpler case of complex surfaces as a step towards understanding the case of Calabi-Yau manifolds. These surfaces can also be used as bases for elliptic three- folds, and their cohomology lifted via the Leray spectral sequence. …”