On the connectedness of the moduli space of Calabi-Yau manifolds Original Research Article

We show that the moduli space of all Calabi-Yau manifolds that can be realized as hypersurfaces described by a transverse polynomial in a four-dimensional weighted projective space, is connected. This is achieved by exploiting techniques of toric geometry and the construction of Batyrev that relate Calabi-Yau manifolds to reflexive polyhedra. Taken together with the previously known fact that the moduli space of all CICYʹs is connected, and is moreover connected to the moduli space of the present class of Calabi-Yau manifolds (since the quintic threefold P4[5] is both CICY and a hypersurface in a weighted P4) this strongly suggests that the moduli space of all simply connected Calabi-Yau manifolds is connected. It is of interest that singular Calabi-Yau manifolds corresponding to the points in which the moduli spaces meet are often, for the present class, more singular than the conifolds that connect the moduli spaces of CICYʹs.