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Einstein manifolds and curvature operator of the second kind

  • Zhi-Lin Dai,
  • Hai-Ping Fu

摘要

We prove that a compact Einstein manifold of dimension \(n\ge 4\) n 4 with nonnegative curvature operator of the second kind is a constant curvature space by Bochner technique. Moreover, we obtain that compact Einstein manifolds of dimension \(n\ge 11\) n 11 with \(\left[ \frac{n+2}{4} \right] \) n + 2 4 -nonnegative curvature operator of the second kind, \(4\ (\text{ resp. },8,9,10)\) 4 ( resp. , 8 , 9 , 10 ) -dimensional compact Einstein manifolds with 2-nonnegative curvature of the second kind and 5-dimensional compact Einstein manifolds with 3-nonnegative curvature of the second kind are constant curvature spaces. Combining with Li’s (J Geom Anal 32:281, 2022) result, we have that a compact Einstein manifold of dimension \(n\ge 4\) n 4 with \(\max \{4,\left[ \frac{n+2}{4} \right] \}\) max { 4 , n + 2 4 } -nonnegative curvature operator of the second kind is a constant curvature space.