An infalling observer in AdS/CFT
Abstract
We describe the experience of an observer falling into a black hole using the AdS/CFT correspondence. In order to do this, we reconstruct the local bulk operators measured by the observer along his trajectory outside the black hole. We then extend our construction beyond the black hole horizon. We show that this is possible because of an effective doubling of the observables in the boundary theory, when it is in a purestate that is close to the thermal state. Our construction allows us to rephrase questions about informationloss and the structure of the metric at the horizon in terms of more familiar CFT correlators. It suggests that to precisely identify blackhole microstates, the observer would need to conduct measurements to an accuracy of . This appears to be inconsistent with the "fuzzball" proposal, and other recent proposals in which pure states in the ensemble of the black hole are represented by macroscopically distinct geometries. Furthermore, our description of the black hole interior in terms of CFT operators provides a natural realization of black hole complementarity and a method of preserving unitarity without "firewalls."
 Publication:

Journal of High Energy Physics
 Pub Date:
 October 2013
 DOI:
 10.1007/JHEP10(2013)212
 arXiv:
 arXiv:1211.6767
 Bibcode:
 2013JHEP...10..212P
 Keywords:

 AdSCFT Correspondence;
 Black Holes;
 1/N Expansion;
 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology
 EPrint:
 72 pages (v2) refs added. typos fixed