How big is a black hole?

Authors :: Christodoulou, Marios
Rovelli, Carlo
Source :: Phys. Rev. D 91, 064046 (2015)
Publication Year :: 2014
Abstract: The 3d volume inside a spherical black hole can be defined by extending an intrinsic flat-spacetime characterization of the volume inside a 2-sphere. For a collapsed object, the volume grows with time since the collapse, reaching a simple asymptotic form, which has a compelling geometrical interpretation. Perhaps surprising, it is large. The result may have relevance for the discussion on the information paradox.<br />Comment: 7 pages, 5 figures. References added