The rigidity of Ricci shrinkers of dimension four

Mathematics - Differential Geometry Differential Geometry (math.DG) FOS: Mathematics 53C 0101 mathematics 01 natural sciences
DOI: 10.1090/tran/7539 Publication Date: 2018-02-21T15:46:59Z
ABSTRACT
1 figure. Any comments are welcome<br/>In dimension $4$, we show that a nontrivial flat cone cannot be approximated by smooth Ricci shrinkers with bounded scalar curvature and Harnack inequality, under the pointed-Gromov-Hausdorff topology. As applications, we obtain uniform positive lower bounds of scalar curvature and potential functions on Ricci shrinkers satisfying some natural geometric properties.<br/>
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