# HEP/Astro Journal Club -- Friday, 28 September 2001

##
A proposal to resolve the black hole information paradox

## Abstract

The black hole information paradox has presented a difficulty
for the unification of general relativity and quantum mechanics.
Even though string theory has suggested very strongly that black hole
evaporation is an information conserving process, the paradox
has remained since we did not know what goes wrong
with Hawking's original calculation of the radiation, which shows that
information is lost. In this talk I will argue that resolving
the paradox needs us to attribute spacelike hypersurfaces with not only
a metric but also a `density of degrees of freedom'. I will then present
evidence from a string theory calculation in support of this conjecture.
We find that the maximum `stretch' of a region of volume V is V/2G;
further stretching dilutes the degrees of freedom so much that
semiclassical propagation breaks down.

## References

S. D. Mathur,
*``Resolving the black hole information paradox,''*
Int.J.Mod.Phys. A15, 4877 (2000)
[gr-qc/0007011].

O. Lunin and S. D. Mathur,
*``AdS/CFT duality and the black hole information paradox,''*
hep-th/0109154.

## 12:00, Smith Lab 4079

George T. Fleming
(
gfleming@mps.ohio-state.edu
),
last updated 24 September 2001.