12,835 research outputs found
Typical Event Horizons in AdS/CFT
We consider the construction of local bulk operators in a black hole
background dual to a pure state in conformal field theory. The properties of
these operators in a microcanonical ensemble are studied. It has been argued in
the literature that typical states in such an ensemble contain firewalls, or
otherwise singular horizons. We argue this conclusion can be avoided with a
proper definition of the interior operators.Comment: 8 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1310.799
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
Soft Black Hole Absorption Rates as Conservation Laws
The absorption rate of low-energy, or soft, electromagnetic radiation by
spherically symmetric black holes in arbitrary dimensions is shown to be fixed
by conservation of energy and large gauge transformations. We interpret this
result as the explicit realization of the Hawking-Perry-Strominger Ward
identity for large gauge transformations in the background of a non-evaporating
black hole. Along the way we rederive and extend previous analytic results
regarding the absorption rate for the minimal scalar and the photon.Comment: 20 Pages, 1 figur
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