![]() However, with what I think I have understood so far, I see several potential issues that I am hoping others might be able to comment on: I have not yet completely understood all of the computations in the paper. (This is relevant for the larger research effort because, if it is true that all of the information that fell into the hole eventually comes out in Hawking radiation before the hole completely evaporates away, then the entanglement entropy, while it might increase for a while once the hole forms, will eventually, after a time called the "Page time", have to start decreasing again, and ultimately must go to zero by the time the hole finally evaporates, since at that point there is no "inside" the hole any longer-all the information is outside, so the outside must be in a zero entropy pure state just as it was before the hole formed in the first place.) The claims made in the paper generally appear to rest on the idea of an "island", which, in somewhat oversimplified terms, is a kind of connection between the Hawking radiation in two "wedges" of the spacetime, the existence of which limits the entanglement entropy between the inside and outside of the hole at late times. What the impact would be on the larger research effort if those claims turned out not to be justified is a separate question that I do not want to get into in this thread. In this thread, I'm not intending to discuss that general research effort, but just to look at the particular models and claims made in this particular paper. The general approach seems to be to show how the information is contained in the entanglements between radiation emitted at early and late times, rather than being contained in individual bits of radiation emitted at particular times, taken by themselves. ![]() ![]() The following paper appeared earlier this year on arxiv, entitled "Islands in Schwarzschild Black Holes":įirst, a bit of background: this paper appears to be part of a larger research effort aimed at resolving the black hole information paradox by showing how all of the information that fell into a black hole does end up coming back out in the Hawking radiation emitted by the hole. ![]()
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