The black hole final state

@article{Horowitz2004TheBH,
  title={The black hole final state},
  author={Gary T. Horowitz and Juan Martin Maldacena},
  journal={Journal of High Energy Physics},
  year={2004},
  volume={2004},
  pages={008-008}
}
We propose that in quantum gravity one needs to impose a final state boundary condition at black hole singularities. This resolves the apparent contradiction between string theory and semiclassical arguments over whether black hole evaporation is unitary. 

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