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arXiv 2311.02404math.DG
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寻找低维空间中的次优爱因斯坦度量

Towards Finding the Second Best Einstein Metric in Low Dimensions

Kevin Poljsak

AI总结:

本研究针对12维以下正数量曲率爱因斯坦流形,在Böhm和Wilking猜想基础上证明存在临界夹角,小于该夹角的单连通流形与球面等距,并显式计算了该角度,推进了次优爱因斯坦流形的研究。

摘要:

在本研究中,我们探究了12维以下、曲率算子充分接近恒等算子的正数量曲率爱因斯坦流形的结构。若一个正数量曲率爱因斯坦流形不与球面局部等距,且其曲率算子与恒等算子的夹角在所有这类流形中最小,则被称为次优爱因斯坦流形。在11维以上的空间中,寻找次优爱因斯坦流形的问题本质上是纯代数问题;根据Böhm和Wilking的猜想,这类流形与特定维度的球面乘积局部等距。在更低维度中,复射影平面的曲率算子与恒等算子的夹角,是用代数方法证明相同结论的阻碍。我们证明,在Böhm和Wilking猜想成立的前提下,存在一个略小于球面乘积与恒等算子夹角的角度值,使得任何曲率算子与恒等算子的夹角小于该值的单连通正数量曲率爱因斯坦流形,都与球面等距。我们还能显式计算出这个角度值。

英文摘要:

In the following work we investigate the structure of Einstein manifolds with positive scalar curvature whose curvature operator is sufficiently close to the identity operator in dimensions below 12. An Einstein manifold with positive scalar curvature, that is not locally isometric to the round sphere, is called the second best Einstein manifold if its curvature operator minimizes the angle to the identity operator among all of these manifolds. In dimensions above 11 the search for the second best Einstein manifold turns out to be of purely algebraic nature and is, by a conjecture of Böhm and Wilking, locally isometric to the product of spheres of a certain dimension. In lower dimensions the angle of the curvature operator of the complex projective plane to the identity operator is an obstruction for proving the same result with algebraic methods. We show that, assuming a conjecture of Böhm and Wilking, there exists an angle slightly smaller than the angle of the product of spheres to the identity operator such that any simply connected Einstein manifold with positive scalar curvature whose angle of the curvature operator to the identity is smaller than this angle is isometric to the round sphere. We will also be able to compute this angle explicitely.

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