In March of this year died Stephen Hawking. Now the last study, the brilliant physicist with three colleagues, wrote appeared. His co-authors on the science website, “arxiv.org" published. It was completed a few days before Hawking’s death and can be considered to be his scientific legacy.

The question of his life, coined

In the thesis, Hawking with a theme, haunting him throughout his career: the so-called information paradox. It is based on the question of what happens to the matter that is transported by the Information when it disappears into a Black hole.

early on thought Hawking and his US colleague, Kip Thorne, whether Information can be destroyed. Finally, Black holes, according to Albert, a catch Einstein’s General relativity theory (GRT) particles from their surroundings and swallowed, goodbye.

So the information about the quantum States is lost, the carry – over of their Spin, the intrinsic angular momentum. According to the rules of quantum mechanics Information cannot be destroyed, but forever, and this contradiction is referred to as the information paradox.

Hawking radiation

From the WAY some of the resulting predictions about the properties of Black holes. So you should by the three variables: mass, electric charge, and Spin to fully define. However, in 1975, developed Hawking a new idea. He postulated that the gravitational monsters also have a temperature and therefore heat radiation.

These later so-called Hawking radiation drains you of energy and leaves you in the Eons to shrink. Finally, they dissolve into a beam of lightning completely. Only: What happens in this scenario with the Information?

“This question was over 40 years in the heart of Hawking’s life,” said study co-author Malcolm Perry of the University of Cambridge to the British “Guardian”. “The difficulty is that something that you throw into a black hole, disappears, apparently. However, as the Information can be extracted about the object again, if the Black hole itself disappears?“ Here is the Newsletter “” subscribe to the Know

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A part of the Information remains the same

In the now published study Hawking and his colleagues come to the conclusion that at least part of the Information could remain the same. Because if an object falls into a black hole, increases not only its temperature but also its disorder, called entropy.

The degree of entropy, the physicists suspect, by means of photons (light particles). These revolve around the so-called event horizon of the Black hole that was once viewed as a “boundary of no return”. From this line nothing more from the force of gravity not radiation-Juggernaut escape – even light.

The physicists call photons, the buzz around the event horizon of the “soft hair”. “Our work shows that the soft-hairs` show the entropy,” says Perry. “This tells us that this hypothesis is on the right track.”

The last encounter with Hawking

of Course, this is not the end of the information paradox. “We do not know whether Hawking entropy gives everything back, which could end up in a Black hole,” said Perry. “We think it’s an important step, but it needs to be worked on.” Among other things, the question of how the entropy-related Information is physically stored in the photons of the soft hair and as she leaves the Black hole, if it evaporates to stay.

In the Guardian describes Perry also his last encounter with Hawking a few days before his death. He worked with his colleague Andrew power, Inger, is from the American Harvard University, in the study and called Hawking, and to discuss with him next steps.

“It was difficult to communicate with him, and I was connected to a speaker, to explain to him where we need to go. He smiled wide, because he knew the end result.“ For his colleagues, the work on the information paradox goes further now, but Stephen Hawking can’t help you anymore.

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