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arXiv 2212.00526math.DG
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满足手征曲率不等式的Poincaré-Einstein四维流形的非退化性

Non-degeneracy of Poincaré-Einstein four-manifolds satisfying a chiral curvature inequality

Joel Fine

摘要:

Poincaré-Einstein度规$g$称为非简并度规,如果在Bianchi规范下,$g$不存在非零的无限小爱因斯坦形变,且这些形变存在于$L^2$中.我们证明了一个四维Poincaré-Einstein度量是非退化的,如果它满足一定的手征曲率不等式。将g的曲率算子中作用于自对偶2-形式的部分写成$R_+$。证明了如果$R_+$是负定的,则$g$是非退化的.这是Biquard和Lee的一个结果的手征推广,即负截面曲率的Poincaré-Einstein度规是非退化的

英文摘要:

A Poincaré-Einstein metric $g$ is called non-degenerate if there are no non-zero infinitesimal Einstein deformations of $g$, in Bianchi gauge, that lie in $L^2$. We prove that a 4-dimensional Poincaré-Einstein metric is non-degenerate if it satisfies a certain chiral curvature inequality. Write $R_+$ for the part of the curvature operator of g which acts on self-dual 2-forms. We prove that if $R_+$ is negative definite then $g$ is non-degenerate. This is a chiral generalisation of a result due to Biquard and Lee, that a Poincaré-Einstein metric of negative sectional curvature is non-degenerate

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