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On the geometry of asymptotically flat manifolds

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arxiv 1908.07248 v3 pith:I7YONT7Z submitted 2019-08-20 math.DG

On the geometry of asymptotically flat manifolds

classification math.DG
keywords asymptoticallyflatmanifoldsmathbbcontrolledgeometryholonomymanifold
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In this paper, we investigate the geometry of asymptotically flat manifolds with controlled holonomy. We show that any end of such manifold admits a torus fibration over an ALE end. In addition, we prove a Hitchin-Thorpe inequality for oriented Ricci-flat $4$-manifolds with curvature decay and controlled holonomy. As an application, we show that any complete asymptotically flat Ricci-flat metric on a $4$-manifold which is homeomorphic to $\mathbb R^4$ must be isometric to the Euclidean or the Taub-NUT metric, provided that the tangent cone at infinity is not $\mathbb R \times \mathbb R_+$.

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