arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.0589math.DGhep-thmath-phmath.MP
收藏

球面上里奇流的古解与广义Hopf纤维化

Ancient solutions of Ricci flow on spheres and generalized Hopf fibrations

Ioannis Bakas, Shengli Kong, Lei Ni

摘要:

古代的解决方案出现在里奇流奇异性的研究。受Fateev关于三维古解的工作的启发,我们构造了球面和复射影空间上里奇流以及紧四元数Kahler流形上扭量空间的高维古解.与Fateev的例子不同,我们的大多数例子都是非崩溃的。本文的建设,不同于特设anastz的Fateev,是系统的,推广(以及统一)以前的建设爱因斯坦度量的Bourguignon-Karcher,詹森,和Ziller在这个意义上说,存在性问题的向后非线性抛物偏微分方程的研究非线性常微分方程系统。求解约化的非线性常微分方程组的关键是在具有对称性的里奇流下找到合适的单调守恒量。除了为球面和射影空间上的里奇流提供新的可能的奇异性模型外,我们的解也是紧致流形上里奇流古老解的一些民间传说的反例.作为一个副产品,我们推断,一些非标准的Einstein度量球和复射影空间是不稳定的里奇流的不动点。

英文摘要:

Ancient solutions arise in the study of Ricci flow singularities. Motivated by the work of Fateev on 3-dimensional ancient solutions we construct high dimensional ancient solutions to Ricci flow on spheres and complex projective spaces as well as the twistor spaces over a compact quaternion-Kahler manifold. Differing from Fateev's examples most of our examples are non-collapsed. The construction of this paper, different from the ad hoc anastz of Fateev, is systematic, generalizing (as well as unifying) the previous constructions of Einstein metrics by Bourguignon-Karcher, Jensen, and Ziller in the sense that the existence problem to a backward nonlinear parabolic PDE is reduced to the study of nonlinear ODE systems. The key step of solving the reduced nonlinear ODE system is to find suitable monotonic and conserved quantities under Ricci flow with symmetry. Besides supplying new possible singularity models for Ricci flow on spheres and projective spaces, our solutions are counter-examples to some folklore conjectures on ancient solutions of Ricci flow on compact manifolds. As a by-product, we infer that some nonstandard Einstein metrics on spheres and complex projective spaces are unstable fixed points of the Ricci flow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑