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Stephen Hawking href = "https://techcrunch.com/2018/03/13/stephen-hawking-has-died-at-76/"> died earlier this year at the age of 76, but his incredible intellect is not yet made contribute to the scientific community. The latest article from the acclaimed physicist is now online and accessible to everyone. He retraces certain mysteries of the physical world that ended up defining his illustrious career.
Entitled "Black Hole Entropy and Soft Hair", the document was co-authored by Hawking collaborators Sasha Haco, Malcolm Perry and Andrew Strominger. The document is available free of charge on the ArXiv prepublication repository and includes a moving tribute to Hawking.
"We are deeply saddened to lose our very dear friend and collaborator, Stephen Hawking, whose contributions to the physics of black holes have always been extremely stimulating," reads the book.
The book serves as a kind of book for Hawking's career, bringing together some of his latest work on the quantum structure of black holes – a topic he has pursued over the last 40 years.
Hawking's latest article should be a technical dive into one of the biggest unresolved questions in physics – and he asked, to begin with: Can matter that falls into a black hole really disappear, even if, according to the laws of physics, be impossible? The paradox is troubling because it opposes the laws of quantum mechanics to those of general relativity.
In the paper, Hawking and his colleagues have proposed that what is called "soft hair" can resolve this tension. The "hair" refers to photons at the event horizon, at the edge of a black hole. In the soft-hair version of the events, the so-called hair on the edge of the black hole actually stored information about the material dropped into the black hole. This would mean that the information attached to this question was not removed at all from the universe, but rather that it seemed to disappear beyond an apparent horizon.
"It's a step forward, but it's definitely not the answer," said co-author Malcolm Perry at The Guardian. "We have a little less headache than before, but there are definitely some troubling issues."
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