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Evaporating Firewalls
In this note, we begin by reviewing an argument (independent from 1304.6483)
that the large AdS black holes dual to typical high-energy pure states of a
single holographic CFT must have some structure at the horizon (i.e. a
firewall/fuzzball). By weakly coupling the CFT to an auxiliary system, such a
black hole can be made to evaporate. In a case where the auxiliary system is a
second identical CFT, it is possible (for specific initial states) that the
system evolves to precisely the thermofield double state as the original black
hole evaporates. In this case, the dual geometry should include the "late-time"
part of the eternal AdS black hole spacetime which includes smooth spacetime
behind the horizon of the original black hole. Thus, we can say that the
firewall evaporates. This provides a specific realization of the recent ideas
of Maldacena and Susskind that the existence of smooth spacetime behind the
horizon of an evaporating black hole can be enabled by maximal entanglement
with a Hawking radiation system (in our case the second CFT) rather than
prevented by it. For initial states which are not finely-tuned to produce the
thermofield double state, the question of whether a late-time infalling
observer experiences a firewall translates to a question about the gravity dual
of a typical high-energy state of a two-CFT system.Comment: 18 pages, LaTe
Firewalls in AdS/CFT
Several recent papers argue against firewalls by relaxing the requirement for
locality outside the stretched horizon. In the firewall argument, locality
essentially serves the purpose of ensuring that the degrees of freedom required
for infall are those in the proximity of the black hole and not the ones in the
early radiation. We make the firewall argument sharper by utilizing the AdS/CFT
framework and claim that the firewall argument essentially states that the dual
to a thermal state in the CFT is a firewall.Comment: 11 pages plus references, 8 figures; version accepted for publication
in JHE
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