Invariants of the harmonic conformal class of an asymptotically flat manifold

Details Invariants of the harmonic conformal class of an asymptotically flat manifold Invariants of the harmonic conformal class of an asymptotically flat manifold

2010-10-20

arxiv.org/abs/1010.4268v1

Mathematics

Differential Geometry

26 pages, 2 figures

Scientific paper

Consider an asymptotically flat Riemannian manifold $(M,g)$ of dimension $n \geq 3$ with nonempty compact boundary. We recall the harmonic conformal class $[g]_h$ of the metric, which consists of all conformal rescalings given by a harmonic function raised to an appropriate power. The geometric significance is that every metric in $[g]_h$ has the same pointwise sign of scalar curvature. For this reason, the harmonic conformal class appears in the study of general relativity, where scalar curvature is related to energy density. Our purpose is to introduce and study invariants of the harmonic conformal class. These invariants are closely related to constrained geometric optimization problems involving hypersurface area-minimizers and the ADM mass. In the final section, we discuss possible applications of the invariants and their relationship with zero area singularities and the positive mass theorem.

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