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Boundary operator associated to $\sigma_k$ curvature

发布时间:2019-06-17 作者: 浏览次数:
Speaker: Yi Wang, Professor DateTime: 2019年6月28日(周五)下午3:00-4:00
Brief Introduction to Speaker:

Yi Wang, Professor, Johns Hopkins University, USA

Place: 六号楼二楼报告厅
Abstract:On a Riemannian manifold $(M, g)$, the $\sigma_k$ curvature is the $k$-th elementary symmetric function of the eigenvalues of the Schouten tensor $A_g$. It is known that the prescibing $\sigma_k$ curvature equation on a closed manifold without boundary is variational if k=1, 2 or $g$ is locally conformally flat; indeed, this problem can be studied by means of the energy $\int \sigma_k(A_g) dv_g$. We construct a natural boundary functional which, when added to this energy, yields as its critical points solutions of prescribing $\sigma_k$ curvature equations with general non-vanishing boundary data. Moreover, we prove that the new energy satisfies the Dirichlet principle. If time permits, I will also discuss applications of our methods. This is joint work with Jeffrey Case.