Spin structures on the Seiberg-Witten moduli spaces

Details Spin structures on the Seiberg-Witten moduli spaces Spin structures on the Seiberg-Witten moduli spaces

2004-04-15

arxiv.org/abs/math/0404275v3

Mathematics

Differential Geometry

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Scientific paper

Let $M$ be an oriented closed 4-manifold and $\cL$ be a $spin^c$ structure on $M$. In this paper we prove that under a suitable condition the Seiberg-Witten moduli space has a canonical spin structure and its spin bordism class is an invariant for $M$. We show that the invariant for $M=#_{j=1}^l M_j$ is not zero, where each $M_j$ is a $K3$ surface or a product of two oriented closed surfaces with odd genus and $l$ is 2 or 3. As a corollary, we obtain the adjunction inequality for $M$. Moreover we show that $M # N$ does not admit Einstein metric for some $N$ with $b^+(N)=0$.

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