Unobstructed deformations for singular Calabi-Yau varieties
Abstract
Let be a compact Gorenstein analytic space with only isolated singularities and trivial dualizing sheaf. A recent paper of Imagi studies the deformation theory of in case the singularities of are weighted homogeneous and rational and is K\"ahler. In this note, assuming that , we generalize Imagi's results to the case where the singularities of are Du Bois, with no assumption that they be weighted homogeneous, and where the K\"ahler assumption is replaced by the hypothesis that there is a resolution of singularities of satisfying the -lemma. As a consequence, if the singularities of are additionally local complete intersections, then the deformations of are unobstructed. The log Calabi-Yau and Fano cases are also discussed.
Cite
@article{arxiv.2506.09857,
title = {Unobstructed deformations for singular Calabi-Yau varieties},
author = {Robert Friedman},
journal= {arXiv preprint arXiv:2506.09857},
year = {2026}
}
Comments
v.2, 18 pages. More details on the generalized $T^1$ lifting property as well as a discussion of the log Calabi-Yau and Fano cases; v.3, discussion of the generalized Fano case, some references added