How does AdS/CFT explain Hawking radiation?
JUAN: It says that Hawking radiation is an approximation to the exact answer. The exact answer is given by this gas of particles on the boundary and it allows you to compute things precisely in a way that information is not lost. If you use the duality it gives a more accurate description than Hawking radiation. Interviewer: Where is the black hole in Ads/CFT? JUAN: The black hole is inside. The boundary is always the same space; the boundary doesn’t change but the black hole horizon exists at some point in the extra dimension. Near the boundary the geometry is always the same but as you move inside you can either have a black hole or not have a black hole. Interviewer: What do you learn about the description of the particles on the boundary of a black hole that you didn’t know before? JUAN: The main lesson was the fact that this description is unitary. It obeys the laws of quantum mechanics. The main new thing is that, using these particles, you understand the entropy; you also unders
