Deformations of Scalar-Flat Anti-Self-Dual metrics and Quotients of Enriques Surfaces

Mathematics – Differential Geometry

Scientific paper

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12 pages. Extensions and corrections are done according to the referee report. To be published in the Turkish Journal of Mathe

Scientific paper

In this article, we prove that a quotient of a $K3$ surface by a free ${\mbb Z}_2\oplus{\mbb Z}_2$ action does not admit any metric of positive scalar curvature. This shows that the scalar flat anti self-dual metrics (SF-ASD) on this manifold can not be obtained from a family of metrics for which the scalar curvature changes sign, contrary to the previously known constructions of this kind of metrics on manifolds of $b^+=0$

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