In the Network appeared the last work of Stephen Hawking

Rodiano Bonacci
Ottobre 13, 2018

Classical physics suggests that nothing could escape a black hole, even light.

Hawking and his colleagues showed in their study that a black hole's entropy may be stored in the particles surrounding the black hole's event horizon.

A report by the Guardian that was posted on Wednesday states that it has been written up by the colleagues at Cambridge and Harvard Universities and now they have posted this online.

The revelation led to physicists scrambling for 40 years for a solution to what was referred to as the black-hole information paradox. Entropy rises the hotter an object gest leading the physicists to speculate that a black hole's entropy may be recorded by soft hair. But after 60 years, Hawking has argued about this as by saying that black holes have the temperature in them.

"Assuming the existence of a quantum Hilbert space on which these charges generate the symmetries, as well as the applicability of the Cardy formula, the central charges reproduce the macroscopic area-entropy law for generic Kerr black holes", a summary of the study says. Perry called Hawking to give him an update, unaware of how ill he was. These soft hair are low-energy quantum excitations that can release information when the celestial object evaporates.

Another one of Hawking's colleagues, Malcolm Perry, a professor of theoretical physics at the University of Cambridge, told The Guardian that the late physicist "knew the final result" of the work before he died and that when Perry explained it to him a few days prior, "he simply produced an enormous smile".

Hawking's final paper was the third in a series of papers looking at black holes, a concept he spent decades studying, particularly the black hole information paradox. So what happens to all the information contained in an object when it tumbles into a black hole.

"It was very hard for Stephen to communicate and I was put on a loudspeaker to explain where we had got to", Perry told the Guardian.

"We don't know that Hawking entropy accounts for everything you could possibly throw at a black hole", he said, "so this is really a step along the way".

It is not the end of the information paradox though. This "Hawking radiation" effect means that, eventually, the black hole will evaporate, leaving behind a vacuum that will look the same for each evaporated black hole, no matter what it ate during its lifetime.

Strominger concluded that "this is excellent progress, but we have much work yet to do".

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