The library of Babel: on the origin of gravitational thermodynamics

@article{Balasubramanian2005TheLO,
  title={The library of Babel: on the origin of gravitational thermodynamics},
  author={Vijay Balasubramanian and Jan de Boer and Vishnu Jejjala and Joan Sim{\'o}n},
  journal={Journal of High Energy Physics},
  year={2005},
  volume={2005},
  pages={006-006}
}
We show that heavy pure states of gravity can appear to be mixed states to almost all probes. For AdS5 Schwarzschild black holes, our arguments are made using the field theory dual to string theory in such spacetimes. Our results follow from applying information theoretic notions to field theory operators capable of describing very heavy states in gravity. For half-BPS states of the theory which are incipient black holes, our account is exact: typical microstates are described in gravity by a… 

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