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arXiv math/0701469math.GT
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2-挠瞬子不变量的SO(3)-形式

An SO(3)-version of 2-torsion instanton invariants

H. Sasahira

摘要:

利用SO(3)-丛上瞬子的模空间的2-扭上同调类,构造了非自旋4-流形的一个不变量。这个不变量是Fintushel-Stern的2-挠率瞬子不变量的SO(3)-版本。我们证明了这个SO(3)-扭转不变量对于$2CP^2 # -CP^2$是非平凡的,而已知的是任何来自Seiberg-Witten理论的$2CP^2 # -CP^2$的已知不变量都是平凡的,因为$2CP^2 # -CP^2$具有正的数量曲率度量.

英文摘要:

We construct an invariant for non-spin 4-manifolds by using 2-torsion cohomology classes of moduli spaces of instantons on SO(3)-bundles. The invariant is an SO(3)-version of Fintushel-Stern's 2-torsion instanton invariant. We show that this SO(3)-torsion invariant is non-trivial for $2CP^2 # -CP^2$, while it is known that any known invariant of $2CP^2 # -CP^2$ coming from the Seiberg-Witten theory is trivial since $2CP^2 # -CP^2$ has a positive scalar curvature metric.

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