Black holes and other clues to the quantum structure of gravity

Understand

Bringing gravity into a quantum-mechanical framework is likely the most profound remaining problem in fundamental physics.

• The "unitarity crisis" for black hole evolution appears to be a key facet of this problem, whose resolution will provide important clues.
• Investigating this raises the important structural question of how to think about subsystems and localization of information in quantum gravity.
• Paralleling field theory, the answer to this is expected to be an important ingredient in the mathematical structure of the theory.