Einstein metrics, harmonic forms, and symplectic four-manifolds

Einstein metrics, harmonic forms, and symplectic four-manifolds
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DOI:
10.1007/s10455-015-9458-0
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发表时间:
2014-08
影响因子:
0.7
通讯作者:
C. LeBrun
C. LeBrun
中科院分区:
数学4区
文献类型:
--
作者:
C. LeBrun

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如果是Del Pezzo曲面的基本光滑定向四维流形,我们考虑黎曼度量集使得,其中是的自对偶Weyl曲率,并且是非平凡的自对偶调和二形。虽然黎曼度量空间中的这个开放区域包含了所有已知的爱因斯坦度量,但我们证明了它不包含其他度量。因此,它恰好为爱因斯坦度规的模空间贡献了一个连通分支。
Ifis the underlying smooth oriented four-manifold of a Del Pezzo surface, we consider the set of Riemannian metricsonsuch that, whereis the self-dual Weyl curvature of, andis a non-trivial self-dual harmonic two-form on. While this open region in the space of Riemannian metrics contains all the known Einstein metrics on, we show that it contains no others. Consequently, it contributes exactly one connected component to the moduli space of Einstein metrics on.