The Deformation Space of Calabi-Yau n-folds with canonical singularities can be obstructed
arXiv:alg-geom/9402014
Abstract
This paper gives a simple example of a family of Calabi-Yaus of any dimension with canonical singularities of dimension one, whose Kuranishi space is singular. Thus the Bogomolov-Tian-Todorov unobstructedness theorem is not true for Calabi-Yaus with canonical singularities.
10 pages, TEX
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