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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 sets of the p-capacitary potential of the horizon boundary, in any asymptotically flat 3-manifold with nonnegative scalar curvature.
Agostiniani et al. (Mon,) studied this question.