what is the hawkin paradox?

Answer 1

After nearly 30 years of arguing that a black hole destroys everything that falls into it, Stephen Hawking is saying he was wrong. It seems that black holes may after all allow information within them to escape. Hawking will present his latest finding at a conference in Ireland next week.

The about-turn might cost Hawking, a physicist at the University of Cambridge, an encyclopaedia because of a bet he made in 1997. More importantly, it might solve one of the long-standing puzzles in modern physics, known as the black hole information paradox.

It was Hawking's own work that created the paradox. In 1976, he calculated that once a black hole forms, it starts losing mass by radiating energy. This "Hawking radiation" contains no information about the matter inside the black hole and once the black hole evaporates, all information is lost.

But this conflicts with the laws of quantum physics, which say that such information can never be completely wiped out. Hawking's argument was that the intense gravitational fields of black holes somehow unravel the laws of quantum physics.

Other physicists have tried to chip away at this paradox. Earlier in 2004, Samir Mathur of Ohio State University in Columbus and his colleagues showed that if a black hole is modelled according to string theory - in which the universe is made of tiny, vibrating strings rather than point-like particles - then the black hole becomes a giant tangle of strings. And the Hawking radiation emitted by this "fuzzball" does contain information about the insides of a black hole (New Scientist print edition, 13 March).

Big reputation
Now, it seems that Hawking too has an answer to the conundrum and the physics community is abuzz with the news. Hawking requested at the last minute that he be allowed to present his findings at the 17th International Conference on General Relativity and Gravitation in Dublin, Ireland.

"He sent a note saying 'I have solved the black hole information paradox and I want to talk about it'," says Curt Cutler, a physicist at the Albert Einstein Institute in Golm, Germany, who is chairing the conference's scientific committee. "I haven't seen a preprint [of the paper]. To be quite honest, I went on Hawking's reputation."

Though Hawking has not yet revealed the detailed maths behind his finding, sketchy details have emerged from a seminar Hawking gave at Cambridge. According to Cambridge colleague Gary Gibbons, an expert on the physics of black holes who was at the seminar, Hawking's black holes, unlike classic black holes, do not have a well-defined event horizon that hides everything within them from the outside world.

In essence, his new black holes now never quite become the kind that gobble up everything. Instead, they keep emitting radiation for a long time, and eventually open up to reveal the information within. "It's possible that what he presented in the seminar is a solution," says Gibbons. "But I think you have to say the jury is still out."

Forever hidden
At the conference, Hawking will have an hour on 21 July to make his case. If he succeeds, then, ironically, he will lose a bet that he and theoretical physicist Kip Thorne of the California Institute of Technology (Caltech) in Pasadena made with John Preskill, also of Caltech.

They argued that "information swallowed by a black hole is forever hidden, and can never be revealed".

"Since Stephen has changed his view and now believes that black holes do not destroy information, I expect him [and Kip] to concede the bet," Preskill told New Scientist. The duo are expected to present Preskill with an encyclopaedia of his choice "from which information can be recovered at will".

Answer 2

The hawking paradox depends on the existence of a black
hole.
A black hole is a theoretical entity which for years i thougth was neat and logical. Now i know a black hole does not and cannot exist. It will not stand up to logical analysis.
First if a black hole did exist it would not be black it would be a 1.5 solar mass ball 6km in diameter which would glow constantly
due to a quantum effect.
It would contain no space which would be required to separate its center from its event horizon.
All its mass would be concentrated at its center.
The mass of the earth is concentrated aT ITS CENTER to anything above its surface a satellite etc.
A satellite above its surfacehas an orbiting velocity that diminishes as its altitude increases
If it orbited in a tunnel below the surface its orbital speed woulded decrease. The deeper it went the slower it would go due to the mass of the earth above it.
A black hole would have all its mass concentrated at the center and if you penetrated the surface [event horizen] the mass would be concentrated at the center.
The orbital at the surface is "C" the speed of light
Any thing that penetrated the surface would have to exceed the speed of light which is impossible.
The consensus then would be that a black hole cannot and does not exist.
Adeeper analyses of this subject make black holes much more impossible!
A thought!!

Answer 3

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Answer 4

It is related to Stephen Hawking. (to be continued).
Whether on not the informations were not destroyed by the black hole, it is his opinion. His statement is not supported by a strong proof.
Read his twin books, for more thoughts about this.
'A brief History of Time' and 'The Universe in a nutshell'.
The website given by braxton p was correct. and the answer and quotes given by Verons gi were very helpful.

Answer 5

Everything about that at this website ==> http://www.newscientist.com/article.ns?id=dn6151