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Sasakian-Einstein structures on 9#(S-2 x S-3)

机译:Sasakian-Einstein结构在9#(S-2 x S-3)上

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摘要

We show that 9#(S(2)xS(3)) admits an 8-dimensional complex family of inequivalent non-regular Sasakian-Einstein structures. These are the first known Einstein metrics on this 5-manifold. In particular, the bound b(2) (M) less than or equal to 8 which holds for any regular Sasakian-Einstein M does not apply to the non-regular case. We also discuss the failure of the Hitchin-Thorpe inequality in the case of 4-orbifolds and describe the orbifold version. [References: 25]
机译:我们显示9#(S(2)xS(3))接受不等价的非常规Sasakian-Einstein结构的8维复杂族。这些是该5流形上的第一个已知的爱因斯坦度量。特别是,对于任何常规的Sasakian-Einstein M而言,小于或等于8的边界b(2)(M)不适用于非常规情况。我们还讨论了在4个球型情况下Hitchin-Thorpe不等式的失败,并描述了球型版本。 [参考:25]

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