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Journal of the American Mathematical Society

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Gravitational instantons from rational elliptic surfaces


Author: Hans-Joachim Hein
Journal: J. Amer. Math. Soc. 25 (2012), 355-393
MSC (2010): Primary 53C25, 14J27
DOI: https://doi.org/10.1090/S0894-0347-2011-00723-6
Published electronically: November 18, 2011
MathSciNet review: 2869021
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Abstract: Let $X$ denote the complex projective plane, blown up at the nine base points of a pencil of cubics, and let $D$ be any fiber of the resulting elliptic fibration on $X$. Using ansatz metrics inspired by work of Gross-Wilson and a PDE method due to Tian-Yau, we prove that $X \setminus D$ admits complete Ricci-flat Kähler metrics in most de Rham cohomology classes. If $D$ is smooth, the metrics converge to split flat cylinders $\mathbb {R}^+ \times S^1 \times D$ at an exponential rate. In this case, we also obtain a partial uniqueness result and a local description of the Einstein moduli space, which contains cylindrical metrics whose cross section does not split off a circle. If $D$ is singular but of finite monodromy, they converge at least polynomially to flat $T^2$-submersions over flat $2$-dimensional cones that need not be quotients of $\mathbb {R}^2$. If $D$ is singular of infinite monodromy, their volume growth rates are $4/3$ and $2$ for the Kodaira types $\textrm {I}_b$ and ${\textrm {I}_b}^*$, their injectivity radii decay like $r^{-1/3}$ and $(\log r)^{-1/2}$, and their curvature tensors decay like $r^{-2}$ and $r^{-2}(\log r)^{-1}$. In particular, the $\textrm {I}_b$ examples show that a curvature estimate due to Cheeger and Tian cannot be improved in general.


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Additional Information

Hans-Joachim Hein
Affiliation: Department of Mathematics, Imperial College, London SW7 2AZ, United Kingdom
MR Author ID: 938594
ORCID: 0000-0002-3719-9549
Email: h.hein@imperial.ac.uk

Received by editor(s): April 24, 2010
Received by editor(s) in revised form: August 25, 2010, September 30, 2011, October 19, 2011, and October 23, 2011
Published electronically: November 18, 2011
Article copyright: © Copyright 2011 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.