Publication of Stephen Hawking's latest scientific paper

Stephen Hawkings' final scientific publication was published by physicists who worked with the late British cosmologist throughout his career to understand what happens to information when objects fall into black holes .

The work, which addresses what theoretical physicists call "the paradox of information," was completed a few days before Hawking's death in March. It has now been written by colleagues at Cambridge and Harvard Universities and posted online, the Guardian reported on Wednesday.

Malcolm Perry, professor of theoretical physics at Cambridge and co-author of the article, "Black Hole Entropy and Soft Hair," said the information paradox was "at the center of Hawking's life" for more than 40 years.

The origins of the puzzle go back to Albert Einstein.

In 1915, Einstein published his theory of general relativity, a tour de force that describes how gravity derives from the material effects of matter that inflects space-time, and explains why planets surround the sun.

But Einstein's theory has also made important predictions about black holes, namely that a black hole can only be completely defined by three characteristics: its mass, its charge and its rotation.

Nearly 60 years later, Hawking claimed that black holes also had a temperature and that since hot objects lose heat in space, the fate of a black hole was to disappear.

"The problem is that if you throw something into a black hole, it seems like it's going away," Perry said.

"How could the information contained in this object be recovered if the black hole disappears on its own?"

In the last article, Hawking and his colleagues show how at least some information can be preserved.

Physicists have shown that the entropy of a black hole can be recorded by the photons surrounding the black hole event horizon, point at which light can not escape the attraction intense gravitational. They call this burst of photons "soft hair".

Among the unknowns that Perry and his colleagues must now explore, there is the way the information associated with entropy is stored physically in soft hair and how this information comes out of a black hole when It evaporates.

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