Sharp bounds on 2m/r for static spherical objects
arXiv:0707.3632 · doi:10.1088/0264-9381/25/19/195021
Abstract
Sharp bounds are obtained, under a variety of assumptions on the eigenvalues of the Einstein tensor, for the ratio of the Hawking mass to the areal radius in static, spherically symmetric space-times.
We changed a footnote in which an earlier result of Håkan Andréasson was not described correctly