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arxiv: math/0504535 · v1 · submitted 2005-04-26 · 🧮 math.DG

Weyl curvature and the Euler characteristic in dimension four

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keywords curvatureboundscharacteristiceulerweylcasecloseddimension
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We give lower bounds, in terms of the Euler characteristic, for the $L^2$-norm of the Weyl curvature of closed Riemannian 4-manifolds. The same bounds were obtained by Gursky, in the case of positive scalar curvature metrics.

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