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Matrix Theory and AdS/CFT duality give nonperturbative constructions of quantum gravity and string theory. They imply that information is not lost in black hole evaporation, and they allow in principle the calculation of quantum gravitational processes like Planckian scattering and the black hole S-matrix. However, they do not seem to give a definitive answer regarding the existence of the black hole firewall. Indeed, the firewall argument seems to point to a limitation of the current understanding of quantum gravity: gauge/ gravity duality gives a great deal of information, but in its current form it does not seem to be complete.

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