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Almost Nonnegative Ricci curvature and new vanishing theorems for genera
Xiaoyang Chen, Jian Ge, Fei Han
We derive several vanishing theorems for genera under almost nonnegative Ricci curvature and infinite fundamental group, which includes Todd genus, -genus, elliptic ge…
Riemannian manifolds with entire Grauert tube are rationally elliptic
Xiaoyang Chen
It was conjectured by Bott-Grove-Halperin that a compact simply connected Riemannian manifold with nonnegative sectional curvature is rationally elliptic. We confirm this conje…
A conformal characterization of manifolds of constant sectional curvature
Xiaoyang Chen, Francisco Fontenele, Frederico Xavier
A special case of the main result states that a complete -connected Riemannian manifold is isometric to one of the models , , of…
New Bochner type theorems
Xiaoyang Chen, Fei Han
A classical theorem of Bochner asserts that the isometry group of a compact Riemannian manifold with negative Ricci curvature is finite. In this paper we give several extensions of…
Holomorphic Euler number of Khler manifolds with almost nonnegative Ricci curvature
Xiaoyang Chen
Let be a compact Khler manifold with almost nonnegative Ricci curvature and nonzero first Betti number. We show that the holomorphic Euler number of vanishes,…
Morse-Novikov cohomology of almost nonnegatively curved manifolds
Xiaoyang Chen
Let be a closed manifold of almost nonnegative sectional curvature and nonzero first de Rham cohomology group. For any , we show that the M…