Resolving the black hole causality paradox

Understand

The black hole information paradox is really a combination of two problems: the causality paradox and the entanglement problem.

• The causality paradox arises because in the semiclassical approximation infalling matter gets causally trapped inside its own horizon; it is therefore unable to send its information back to infinity if we disallow propagation outside the light cone.
• We show how the causality paradox is resolved in the fuzzball paradigm.
• One needs to distinguish between two kinds of Rindler spaces: (a) Rindler space obtained by choosing accelerating coordinates in Minkowski space and (b) `pseudo-Rindler' space, which describes the region near the surface of a fuzzball.