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In a paper \cite{P} in 1973, R. Penrose made a physical argument that the total mass of a spacetime which contains black holes with event horizons of total area $A$ should be at least $\sqrt{A/16\pi}$. An important special case of this…

Differential Geometry · Mathematics 2007-05-23 Hubert L. Bray

Motivated by the rigidity case in the localized Riemannian Penrose inequality, we show that suitable singular metrics attaining the optimal value in the Riemannian Penrose inequality is necessarily smooth in properly specified coordinates.…

Differential Geometry · Mathematics 2020-10-19 Siyuan Lu , Pengzi Miao

The Positive Mass Theorem states that a complete asymptotically flat manifold of nonnegative scalar curvature has nonnegative mass. The Riemannian Penrose inequality provides a sharp lower bound for the mass when black holes are present.…

Differential Geometry · Mathematics 2019-12-19 Hubert L. Bray , Dan A. Lee

We prove the Riemannian Penrose inequality in arbitrary dimension for smooth complete asymptotically flat manifolds with nonnegative scalar curvature and compact outer-minimizing minimal boundary, where the boundary is allowed to have a…

Differential Geometry · Mathematics 2026-05-04 Yuchen Bi , Jintian Zhu

In this article, we prove the Riemannian Penrose inequality for asymptotically flat manifolds with non-compact boundary whose asymptotic region is modelled on a half-space. Such spaces were initially considered by Almaraz, Barbosa and de…

Differential Geometry · Mathematics 2020-01-15 Thomas Koerber

The Riemannian Penrose inequality is a fundamental result in mathematical relativity. It has been a long-standing conjecture of G. Huisken that an analogous result should hold in the context of extrinsic geometry. In this paper, we resolve…

Differential Geometry · Mathematics 2024-11-05 Michael Eichmair , Thomas Koerber

We prove that the Riemannian Penrose Inequality holds for Asymptotically Flat $3$-manifolds with nonnegative scalar curvature and connected horizon boundary, provided the optimal decay assumptions are met, which result in the $\mathrm{ADM}$…

Differential Geometry · Mathematics 2024-11-21 Luca Benatti , Mattia Fogagnolo , Lorenzo Mazzieri

Let $M^n$ be an $n$-dimensional Riemannian manifold with boundary $\partial M$. Assume that Ricci curvature is bounded from below by $(n-1)k$, for $k\in \RR$, we give a sharp estimate of the upper bound of $\rho(x)=\dis(x, \partial M)$, in…

Differential Geometry · Mathematics 2014-11-11 Jian Ge

In 1973, R. Penrose presented an argument that the total mass of a space-time which contains black holes with event horizons of total area $A$ should be at least $\sqrt{A/16\pi}$. An important special case of this physical statement…

General Relativity and Quantum Cosmology · Physics 2007-05-23 Hubert L. Bray , Piotr T. Chrusciel

The Penrose inequality gives a lower bound for the total mass of a spacetime in terms of the area of suitable surfaces that represent black holes. Its validity is supported by the cosmic censorship conjecture and therefore its proof (or…

General Relativity and Quantum Cosmology · Physics 2009-10-02 Marc Mars

We establish a lower bound on the total mass of the time slices of (n + 1)-dimensional asymptotically flat standard static spacetimes under the timelike convergence condition. The inequality can be viewed equivalently as a Minkowski-type…

General Relativity and Quantum Cosmology · Physics 2026-02-11 Brian Harvie

The Penrose inequality estimates the lower bound of the mass of a black hole in terms of the area of its horizon. This bound is relatively loose for extremal or near extremal black holes. We propose a new Penrose-like inequality for static…

General Relativity and Quantum Cosmology · Physics 2022-10-21 H. Khodabakhshi , H. Lu , Run-Qiu Yang

Substatic Riemannian manifolds with minimal boundary arise naturally in General Relativity as spatial slices of static spacetimes satisfying the Null Energy Condition. Moreover, they constitute a vast generalization of nonnegative Ricci…

Differential Geometry · Mathematics 2023-07-28 Stefano Borghini , Mattia Fogagnolo

We provide a new proof of the Riemannian Penrose inequality for time-symmetric asymptotically flat initial data with a single black-hole horizon. The proof proceeds through a newly established monotonicity formula holding along the level…

Differential Geometry · Mathematics 2025-05-26 Virginia Agostiniani , Carlo Mantegazza , Lorenzo Mazzieri , Francesca Oronzio

Riemannian Penrose Inequalities are precise geometric statements that imply that the total mass of a zero second fundamental form slice of a spacetime is at least the mass contributed by the black holes, assuming that the spacetime has…

Differential Geometry · Mathematics 2024-03-21 Hubert Bray , Yiyue Zhang

We prove that complete Riemannian manifolds with polynomial growth and Ricci curvature bounded from below, admit uniform Poincar\'e inequalities. A global, uniform Poincar\'e inequality for horospheres in the universal cover of a closed,…

Differential Geometry · Mathematics 2018-01-15 Gérard Besson , Gilles Courtois , Sa'ar Hersonsky

We apply the Riemannian Penrose inequality and the Riemannian positive mass theorem to derive inequalities on the boundary of a class of compact Riemannian $3$-manifolds with nonnegative scalar curvature. The boundary of such a manifold has…

Differential Geometry · Mathematics 2017-12-29 Pengzi Miao , Naqing Xie

Let $M$ be a compact $n$-dimensional Riemannian manifold with nonnegative Ricci curvature and mean convex boundary $\partial M$. Assume that the mean curvature $H$ of the boundary $\partial M$ satisfies $H \geq (n-1) k >0$ for some positive…

Differential Geometry · Mathematics 2020-01-06 Martin Li

We prove the validity of an inequality involving a mean of the area and the length of the boundary of immersed disks whose boundaries are homotopically non-trivial curves in an oriented compact manifold which possesses convex mean curvature…

Differential Geometry · Mathematics 2021-04-08 Ezequiel Barbosa , Franciele Conrado

The Riemannian Penrose inequality (RPI) bounds from below the ADM mass of asymptotically flat manifolds of nonnegative scalar curvature in terms of the total area of all outermost compact minimal surfaces. The general form of the RPI is…

Differential Geometry · Mathematics 2018-12-10 Jeffrey L. Jauregui
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