The signature of the Seiberg-Witten surface

Details The signature of the Seiberg-Witten surface The signature of the Seiberg-Witten surface

2008-02-11

arxiv.org/abs/0802.1363v5

Surv. Differ. Geom., 15, Int. Press, Sommerville, MA, 2010

Mathematics

Differential Geometry

22 pages

Scientific paper

The Seiberg-Witten family of elliptic curves defines a Jacobian rational elliptic surface $\Z$ over $\mathbb{C}\mathrm{P}^1$. We show that for the $\bar{\partial}$-operator along the fiber the logarithm of the regularized determinant $-1/2 \log \det' (\bar\partial^* \bar\partial)$ satisfies the anomaly equation of the one-loop topological string amplitude derived in Kodaira-Spencer theory. We also show that not only the determinant line bundle with the Quillen metric but also the $\bar{\partial}$-operator itself extends across the nodal fibers of $\mathrm{Z}$. The extension introduces current contributions to the curvature of the determinant line bundle at the points where the fibration develops nodal fibers. The global anomaly of the determinant line bundle then determines the signature of $\mathrm{Z}$ which equals minus the number of hypermultiplets.

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