学术报告

Asymptotic behavior of solutions to the Yamabe equation with an asymptotically flat metric-Prof. Zheng-Chao Han (Rutgers University)

报告题目:Asymptotic behavior of solutions to the Yamabe equation with an asymptotically flat metric

报告人:Prof. Zheng-Chao Han (Rutgers University)

摘要:In this talk we will discuss joint work with Jingang Xiong (Beijing Normal University) and Lei Zhang (University of Florida), which proves that any positive solutionof the Yamabe equation on an asymptotically flat n-dimensional manifold of flatness order at least (n−2)/2 and n≤24 must converge at infinity either to a fundamental solution of the Laplace operator on the Euclidean space or to a radial Fowler solution defined on the entire Euclidean space. The flatness order (n−2)/2 is the minimal flatness order required to define ADM mass in general relativity; the dimension 24 is the dividing dimension of the validity of compactness of solutions to the Yamabe problem. We also prove such alternatives for bounded solutions when n > 24.

We prove these results by establishing appropriate asymptotic behavior near an isolated singularity of solutions to the Yamabe equation when the metric has a flatness order of at least (n−2)/2 at the singularity and n≤24, also when n > 24 and the solution grows no faster than the fundamental solution of the flat metric Laplacian at the singularity. These results extend earlier results of L. Caffarelli, B. Gidas and J. Spruck, also of N. Korevaar, R. Mazzeo, F. Pacard and R. Schoen, when the metric is conformally flat, and work of C. C. Chen and C. S. Lin when the scalar curvature is a non-constant function with appropriate flatness at the singular point, also work of F. Marques when the metric is not necessarily conformally flat but smooth, and the dimension of the manifold is three, four, or five, as well as recent similar results by the second and third authors in dimension six.

Key ingredients in our proof include improved methods to prove appropriate upper and lower bounds of the solution near the singular point.

报告时间:2023年6月6日(周二)上午10:30-11:30

报告地点:校本部教二楼711教室

邀请人:戎小春、胥世成