New integral estimates in substatic Riemannian manifolds and the Alexandrov Theorem

Abstract. We derive new integral estimates on substatic manifolds with boundary of horizon type, naturally arising in General Relativity. In particular, we generalize to this setting an identity due to Magnanini-Poggesi [MP19] leading to the Alexandrov Theorem in R and improve on a Heintze-Karcher type inequality due to Li-Xia [LX19]. Our method relies on the introduction of a new vector field with nonnegative divergence, generalizing to this setting the P-function technique of Weinberger [Wei71].

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