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arXiv math/0404275math.DG
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Seiberg-Witten模空间上的自旋结构

Spin structures on the Seiberg-Witten moduli spaces

H. Sasahira

摘要:

设$M$是定向闭四维流形,$\cL$是$M$上的$spin^c$结构.本文证明了在适当的条件下,Seiberg-Witten模空间具有正则自旋结构,其自旋边类是$M$的不变量.我们证明了$M=#_{j=1}^l M_j$的不变量不为零,其中每个$M_j$是一个$K3$曲面或两个具有奇亏格的定向闭曲面的乘积,并且$l$是2或3。作为推论,我们得到了$M$的附加不等式.此外,我们还证明了对于某些具有$b^+(N)=0$的$N$,$M # N$不允许Einstein度量.

英文摘要:

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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