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Showing posts with label black holes. Show all posts
Showing posts with label black holes. Show all posts

Friday, 17 October 2014

Black holes do NOT exist and the Big Bang Theory is wrong, claims scientist - and she has the maths to prove it


Black holes do NOT exist and the Big Bang Theory is wrong, claims scientist - and she has the maths to prove it

 A scientist from University of North Carolina states she has mathematical proof that black holes (illustrated) can't exist. She said it is impossible for stars to collapse and form a singularity. Previously, scientists thought stars  larger than the sun collapsed under their own gravity and formed black holes as they died

 A nonexistent black hole - like all portrayals, merely an artist's 'impression'

 

  • Scientist claims she has mathematical proof black holes cannot exist
  • She said it is impossible for stars to collapse and form a singularity
  • Professor Laura Mersini-Houghton said she is still in 'shock' from the find
  • Previously, scientists thought stars much larger than the sun collapsed under their own gravity and formed black holes when they died
  • During this process they release a type of radiation called Hawking radiation
  • But new research claims the star would lose too much mass and wouldn't be able to form a black hole
  • If true, the theory that the universe began as a singularity, followed by the Big Bang, could also be wrong






When a huge star many times the mass of the sun comes to the end of its life it collapses in on itself and forms a singularity - creating a black hole where gravity is so strong that not even light itself can escape.

At least, that’s what we thought.

A scientist has sensationally said that it is impossible for black holes to exist - and she even has mathematical proof to back up her claims. If true, her research could force physicists to scrap their theories of how the universe began.

 
A scientist from University of North Carolina states she has mathematical proof that black holes (illustrated) can't exist. She said it is impossible for stars to collapse and form a singularity. Previously, scientists thought stars larger than the sun collapsed under their own gravity and formed black holes as they died

The research was conducted by Professor Laura Mersini-Houghton from the University of North Carolina at Chapel Hill in the College of Arts and Scientists.

 She claims that as a star dies, it releases a type of radiation known as Hawking radiation - predicted by Professor Stephen Hawking.


However in this process, Professor Mersini-Houghton believes the star also sheds mass, so much so that it no longer has the density to become a black hole.

Before the black hole can form, she said, the dying star swells and explodes.

The singularity as predicted never forms, and neither does the event horizon - the boundary of the black hole where not even light can escape.

‘I’m still not over the shock,’ said Professor Mersini-Houghton.

‘We’ve been studying this problem for a more than 50 years and this solution gives us a lot to think about.’

Experimental evidence may one day provide physical proof as to whether or not black holes exist in the universe. 

But for now, Mersini-Houghton says the mathematics are conclusive. 

What’s more, the research could apparently even call into question the veracity of the Big Bang theory. 

Most physicists think the universe originated from a singularity that began expanding with the Big Bang about 13.8 billion years ago.

If it is impossible for singularities to exist, however, as partially predicted by Professor Mersini-Houghton, then that theory would also be brought into question.


THIS is what a [non-existent] black hole looks like



 

THE BLACK HOLE INFORMATION PARADOX

 

One of the biggest unanswered questions about black holes is the so-called information paradox.

Under current theories for black holes it is thought that nothing can escape from the event horizon around a black hole - not even light itself.

Inside the black hole is thought to be a singularity where matter is crushed to an infinitesimally small point as predicted by Einstein's theory of gravity.

However, a fundamental law of quantum theory states that no information from the universe can ever disappear.

This creates a paradox; how can a black hole make matter and information 'disappear'? 

Professor Mersini-Houghton's new theory manages to explain why this might be so - namely because black holes as we know them cannot exist.



During the collapse process stars release a type of radiation called Hawking radiation (shown). But Professor Mersini-Houghton claims this process means the star loses too much mass and can't form a black hole. And this also apparently means the Big Bang theory, that the universe began as a singularity, may not be correct

During the collapse process stars release a type of radiation called Hawking radiation (shown). But Professor Mersini-Houghton claims this process means the star loses too much mass and can't form a black hole. And this also apparently means the Big Bang theory, that the universe began as a singularity, may not be correct

 

THERE ARE NO BLACK HOLES, ONLY GREY HOLES, CLAIMS HAWKING

 

Earlier this year Professor Stephen Hawking shocked physicists by saying 'there are no black holes'.

In a paper published online, Professor Hawking instead argues there are 'grey holes'

'The absence of event horizons means that there are no black holes - in the sense of regimes from which light can't escape to infinity,' he says in the paper, called Information Preservation and Weather Forecasting For Black Holes.

He says that the idea of an event horizon, from which light cannot escape, is flawed.

He suggests that instead light rays attempting to rush away from the black hole’s core will be held as though stuck on a treadmill and that they can slowly shrink by spewing out radiation.  

One of the reasons black holes are so bizarre is that they pit two fundamental theories of the universe against each other.

Namely, Einstein’s theory of gravity predicts the formation of black holes. But a fundamental law of quantum theory states that no information from the universe can ever disappear.

Efforts to combine these two theories proved problematic, and has become known as the black hole information paradox - how can matter permanently disappear in a black hole as predicted?

Professor Mersini-Houghton’s new theory does manage to mathematically combine the two fundamental theories, but with unwanted effects for people expecting black holes to exist.

‘Physicists have been trying to merge these two theories - Einstein’s theory of gravity and quantum mechanics - for decades, but this scenario brings these two theories together, into harmony,’ said Professor Mersini-Houghton.

‘And that’s a big deal.’


From the Daily Mail @ http://www.dailymail.co.uk/sciencetech/article-2769156/Black-holes-NOT-exist-Big-Bang-Theory-wrong-claims-scientist-maths-prove-it.html






For more evidence that black holes don’t exist (more ways to disprove a double negative) see http://nexusilluminati.blogspot.com/search/label/no%20black%20holes  
For more evidence that there was NO 'Big Bang' see http://nexusilluminati.blogspot.com/search/label/no%20big%20bang
- Scroll down through ‘Older Posts’ at the end of each section


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Saturday, 8 February 2014

Stephen Hawking: 'There are no black holes'


Stephen Hawking: 'There are no black holes'
Notion of an 'event horizon', from which nothing can escape, is incompatible with quantum theory, physicist claims.







The defining characteristic of a black hole may have to give, if the two pillars of modern physics — general relativity and quantum theory — are both correct.


Most physicists foolhardy enough to write a paper claiming that “there are no black holes” — at least not in the sense we usually imagine — would probably be dismissed as cranks. But when the call to redefine these cosmic crunchers comes from Stephen Hawking, it’s worth taking notice. In a paper posted online, the physicist, based at the University of Cambridge, UK, and one of the creators of modern black-hole theory, does away with the notion of an event horizon, the invisible boundary thought to shroud every black hole, beyond which nothing, not even light, can escape.



“There is no escape from a black hole in classical theory, but quantum theory enables energy and information to escape.”




In its stead, Hawking’s radical proposal is a much more benign “apparent horizon”, which only temporarily holds matter and energy prisoner before eventually releasing them, albeit in a more garbled form.

“There is no escape from a black hole in classical theory,” Hawking told Nature. Quantum theory, however, “enables energy and information to escape from a black hole”. A full explanation of the process, the physicist admits, would require a theory that successfully merges gravity with the other fundamental forces of nature. But that is a goal that has eluded physicists for nearly a century. “The correct treatment,” Hawking says, “remains a mystery.”

Hawking posted his paper on the arXiv preprint server on 22 January1. He titled it, whimsically, 'Information preservation and weather forecasting for black holes', and it has yet to pass peer review. The paper was based on a talk he gave via Skype at a meeting at the Kavli Institute for Theoretical Physics in Santa Barbara, California, in August 2013 (watch video of the talk).


Fire fighting

Hawking's new work is an attempt to solve what is known as the black-hole firewall paradox, which has been vexing physicists for almost two years, after it was discovered by theoretical physicist Joseph Polchinski of the Kavli Institute and his colleagues (see 'Astrophysics: Fire in the hole!').

In a thought experiment, the researchers asked what would happen to an astronaut unlucky enough to fall into a black hole. Event horizons are mathematically simple consequences of Einstein's general theory of relativity that were first pointed out by the German astronomer Karl Schwarzschild in a letter he wrote to Einstein in late 1915, less than a month after the publication of the theory. In that picture, physicists had long assumed, the astronaut would happily pass through the event horizon, unaware of his or her impending doom, before gradually being pulled inwards — stretched out along the way, like spaghetti — and eventually crushed at the 'singularity', the black hole’s hypothetical infinitely dense core.

But on analysing the situation in detail, Polchinski’s team came to the startling realization that the laws of quantum mechanics, which govern particles on small scales, change the situation completely. Quantum theory, they said, dictates that the event horizon must actually be transformed into a highly energetic region, or 'firewall', that would burn the astronaut to a crisp.

This was alarming because, although the firewall obeyed quantum rules, it flouted Einstein’s general theory of relativity. According to that theory, someone in free fall should perceive the laws of physics as being identical everywhere in the Universe — whether they are falling into a black hole or floating in empty intergalactic space. As far as Einstein is concerned, the event horizon should be an unremarkable place.


Beyond the horizon

Now Hawking proposes a third, tantalizingly simple, option. Quantum mechanics and general relativity remain intact, but black holes simply do not have an event horizon to catch fire. The key to his claim is that quantum effects around the black hole cause space-time to fluctuate too wildly for a sharp boundary surface to exist.

In place of the event horizon, Hawking invokes an “apparent horizon”, a surface along which light rays attempting to rush away from the black hole’s core will be suspended. In general relativity, for an unchanging black hole, these two horizons are identical, because light trying to escape from inside a black hole can reach only as far as the event horizon and will be held there, as though stuck on a treadmill. However, the two horizons can, in principle, be distinguished. If more matter gets swallowed by the black hole, its event horizon will swell and grow larger than the apparent horizon.

Conversely, in the 1970s, Hawking also showed that black holes can slowly shrink, spewing out 'Hawking radiation'. In that case, the event horizon would, in theory, become smaller than the apparent horizon. Hawking’s new suggestion is that the apparent horizon is the real boundary. “The absence of event horizons means that there are no black holes — in the sense of regimes from which light can't escape to infinity,” Hawking writes.

“The picture Hawking gives sounds reasonable,” says Don Page, a physicist and expert on black holes at the University of Alberta in Edmonton, Canada, who collaborated with Hawking in the 1970s. “You could say that it is radical to propose there’s no event horizon. But these are highly quantum conditions, and there’s ambiguity about what space-time even is, let alone whether there is a definite region that can be marked as an event horizon.”

Although Page accepts Hawking’s proposal that a black hole could exist without an event horizon, he questions whether that alone is enough to get past the firewall paradox. The presence of even an ephemeral apparent horizon, he cautions, could well cause the same problems as does an event horizon.

Unlike the event horizon, the apparent horizon can eventually dissolve. Page notes that Hawking is opening the door to a scenario so extreme “that anything in principle can get out of a black hole”. Although Hawking does not specify in his paper exactly how an apparent horizon would disappear, Page speculates that when it has shrunk to a certain size, at which the effects of both quantum mechanics and gravity combine, it is plausible that it could vanish. At that point, whatever was once trapped within the black hole would be released (although not in good shape).
http://farm9.staticflickr.com/8480/8196107204_6068b68386_k.jpg
If Hawking is correct, there could even be no singularity at the core of the black hole. Instead, matter would be only temporarily held behind the apparent horizon, which would gradually move inward owing to the pull of the black hole, but would never quite crunch down to the centre. Information about this matter would not destroyed, but would be highly scrambled so that, as it is released through Hawking radiation, it would be in a vastly different form, making it almost impossible to work out what the swallowed objects once were.

“It would be worse than trying to reconstruct a book that you burned from its ashes,” says Page. In his paper, Hawking compares it to trying to forecast the weather ahead of time: in theory it is possible, but in practice it is too difficult to do with much accuracy.

Polchinski, however, is sceptical that black holes without an event horizon could exist in nature. The kind of violent fluctuations needed to erase it are too rare in the Universe, he says. “In Einstein’s gravity, the black-hole horizon is not so different from any other part of space,” says Polchinski. “We never see space-time fluctuate in our own neighbourhood: it is just too rare on large scales.”

Raphael Bousso, a theoretical physicist at the University of California, Berkeley, and a former student of Hawking's, says that this latest contribution highlights how “abhorrent” physicists find the potential existence of firewalls. However, he is also cautious about Hawking’s solution. “The idea that there are no points from which you cannot escape a black hole is in some ways an even more radical and problematic suggestion than the existence of firewalls,” he says. "But the fact that we’re still discussing such questions 40 years after Hawking’s first papers on black holes and information is testament to their enormous significance."

Nature
doi:10.1038/nature.2014.14583


From Nature @ http://www.nature.com/news/stephen-hawking-there-are-no-black-holes-1.14583

 



See Infinite Cosmos of Light and Life: Black Holes Don’t Exist @ http://nexusilluminati.blogspot.com.au/2013/03/infinite-cosmos-of-light-and-life-dark.html
 

For more information about absence of black holes see http://nexusilluminati.blogspot.com/search/label/no%20black%20holes  
- See ‘Older Posts’ at the end of each section


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