Stephen Hawking's final scientific paper on blackholes released

Prof Stephen Hawking's final book is called Brief Answers to the Big Questions

Hawking and his colleagues have refuted this idea - in their opinion, information can be stored in the "soft hair", the hologram of the input particles on the boundary of the black hole. It was completed just days before Hawking died, in March.

The information paradox is a puzzle that comes from the combination of Albert Einstein's theory on general relativity and quantum mechanics.

"We are deeply saddened by the loss of our dear friend and colleague of Stephen Hawking, whose contribution to the physics of black holes remained vividly stimulating to the very end". According to the laws of physics, no information should be lost - all the information from the past can be recovered.

In 2016, the scientists proposed the idea of "soft hairs", photons and gravitons that escape from a black hole's event horizon or the point at which nothing - not even light - could escape.

The physicists show in their paper that a black hole's entropy may be recorded by photons that surround the black hole's event horizon, the point at which light can not escape the intense gravitational pull.

"It was very hard for Stephen to communicate and I was put on a loudspeaker to explain where we had got to". He also said that when he tried to explain the results of the study to Hawking a few days before his death, "he simply produced an enormous smile". "He knew the final result", said Perry. Since hot articles lose warm into space, a definitive destiny of a dark gap is to dissipate out of presence.

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"The entropy is a measure of how many different ways an object could be made from its microscopic ingredients and still look the same".

The study was groundbreaking revealing that even Hawking's original argument was flawed in some way and most importantly that no-hair black hole theories were unfounded. This solves the information paradox.

"What this paper does is show that "soft hair" can account for the entropy", said Perry. "It's telling you that soft hair really is doing the right stuff", Perry went on to say.

It is not the end of the information paradox though.

Strominger concluded that "this is excellent progress, but we have much work yet to do". So it turned out that black holes aren't entirely "black" - they emit "Hawking radiation", consisting of photons, neutrinos, and to a lesser extent all sorts of massive particles. "The authors have to make several non-trivial assumptions so the next steps will be to show that these assumptions are valid".

The paper is now online via the pre-print resource arxiv.org.

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