According to the Wikipedia article on Black holes:
"At the center of a
black hole lies the singularity, where matter is crushed to infinite density, the pull of gravity is infinitely strong, and spacetime has infinite curvature.[37] This means that a black hole's mass becomes entirely compressed into a region with zero volume.[38] This zero-volume, infinitely dense region at the center of a black hole is called a gravitational singularity." [url]http://en.wikipedia.org/wiki/Black_hole#Singularity[/url
However, it is my recollection that Dr. Susskind, in his book the Black Hole Wars, claimed that the Heisenberg
uncertainty principle precludes a black hole singularity of infinite density. Specifically, Dr. Susskind's believes that "quantum jitters" will cause the singularity to spread out.
Does anyone know what the maximum density is predicted to be at the center of a black hole when "quantum jitters" is appropriately considered?