The blowdown of the zero section of the canonical bundle of the first del Pezzo surface $dP_{1}$, the blowup of $CP^{2}$ at one point, is a CalabiYau cone. I was just wondering if this cone admitted a smoothing. Is the same thing true for the blowdown of the zero section of the canonical bundle of the second del Pezzo surface $dP_{2}$, the blowup of $CP^{2}$ at two points. Thanks!
Take the 2minute tour
×
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.
The answer to this question is contained in the article of Mark Gross, page 33 Deforming CalabiYau Threefolds http://arxiv.org/abs/alggeom/9506022 The first cone can not be smoothed the second one can be smoothed (in the terminology of Gross, which is standard, $dP_1$ is a delPezzo of degree 8, $dP_2$ is the del Pezzo of degree 7). 

