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Keyword: informationparadox

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  • Physicists Think They've Finally Cracked Stephen Hawking's Famous Black Hole Paradox

    03/18/2022 12:33:55 PM PDT · by Red Badger · 24 replies
    https://www.sciencealert.com ^ | 18 March 2022 | MIKE MCRAE
    <p>At the heart of every black hole sits a problem. As they sizzle away into nothingness over the eons, they take with them a small piece of the Universe. Which, quite frankly, just isn't in the rule book.</p><p>It's a paradox the late Stephen Hawking left us with as a part of his revolutionary work on these monstrous objects, inspiring researchers to tinker with potential solutions for the better part of half a century.</p>
  • This Physicist Discovered an Escape From Hawking’s Black Hole Paradox

    08/25/2021 10:56:56 AM PDT · by Red Badger · 50 replies
    https://www.quantamagazine.org ^ | August 23, 2021 | Natalie Wolchover
    The five-decade-old paradox — long thought key to linking quantum theory with Einstein’s theory of gravity — is falling to a new generation of thinkers. Netta Engelhardt is leading the way. =============================================================================== In 1974, Stephen Hawking calculated that black holes’ secrets die with them. Random quantum jitter on the spherical outer boundary, or “event horizon,” of a black hole will cause the hole to radiate particles and slowly shrink to nothing. Any record of the star whose violent contraction formed the black hole — and whatever else got swallowed up after — then seemed to be permanently lost. Hawking’s calculation...
  • Why Don't Black Holes Swallow All of Space? This Explanation Is Blowing Our Minds

    08/16/2021 11:38:08 AM PDT · by Red Badger · 36 replies
    https://www.sciencealert.com ^ | Aug 16, 2021 | MIKE MCRAE
    Black holes are great at sucking up matter. So great, in fact, that not even light can escape their grasp (hence the name). But given their talent for consumption, why don't black holes just keep expanding and expanding and simply swallow the Universe? In 2018, one of the world's top physicists came up with a dazzling explanation. Conveniently, the idea could also unite the two biggest theories in all of physics. The researcher behind this explanation is none other than Stanford University physicist Leonard Susskind, also known as one of the fathers of string theory. He gave his two cents...
  • Powerful Magnetic Fields Surrounding Black Hole Are Strong Enough to Resist Gravity

    03/25/2021 11:23:42 AM PDT · by Red Badger · 27 replies
    https://scitechdaily.com ^ | MARCH 25, 2021 | By UNIVERSITY OF THE WITWATERSRAND
    Polarized view of the black hole in M87. The lines mark the orientation of polarization, which is related to the magnetic field around the shadow of the black hole. Credit: EHT Collaboration ===================================================================== Wits University astrophysicists are the only two scientists on African continent that contributed to the study. The Event Horizon Telescope (EHT) collaboration, a multinational team of over 300 scientists including two astrophysicists from the University of the Witwatersrand (Wits University), has revealed a new view of the massive object at the center of the M87 galaxy: how it looks in polarized light. This is the first time...
  • Lab-grown [sort of] black hole behaves just like Stephen Hawking said it would

    03/02/2021 7:47:31 AM PST · by BenLurkin · 29 replies
    Live Science ^ | 03/02/2021 | Tim Childers
    The researchers' lab-grown black hole was made of a flowing gas of approximately 8,000 rubidium atoms cooled to nearly absolute zero and held in place by a laser beam. They created a mysterious state of matter, known as a Bose-Einstein Condensate (BEC), which allows thousands of atoms to act together in unison as though they were a single atom. Using a second laser beam, the team created a cliff of potential energy, which caused the gas to flow like water rushing down a waterfall, thereby creating an event horizon where one half of the gas was flowing faster than the...
  • The Most Famous Paradox in Physics Nears Its End

    10/30/2020 3:38:08 AM PDT · by Candor7 · 37 replies
    Quanta Magazine ^ | 29 October 2020 | George Musser
    ......................................And that led to a remarkable twist in the story. Because the radiation is highly entangled with the black hole it came from, the quantum computer, too, becomes highly entangled with the hole. Within the simulation, the entanglement translates into a geometric link between the simulated black hole and the original. Put simply, the two are connected by a wormhole. “There’s the physical black hole and then there’s the simulated one in the quantum computer, and there can be a replica wormhole connecting those,” said Douglas Stanford, a theoretical physicist at Stanford and a member of the West Coast team....
  • Stephen Hawking was right: 'Black hole' created in a lab confirms the late physicist's [tr]

    05/30/2019 3:59:10 AM PDT · by C19fan · 31 replies
    UK Daily Mail ^ | May 29, 2019 | James Pero
    After the first-ever image of a black hole confirmed theories posited by Einstein, it's the late scientist Stephen Hawking's turn to have parts of his life's work vindicated. In a paper published in Nature, scientists say that have verified the scientist's namesake theory, Hawking Radiation, which hypothesized that black holes emit radiation from their surfaces due to a mix of different factors regarding quantum physics and gravity. To verify the theory, scientists at the Technion-Israel Institute of Technology turned to what sounds like mad science: creating their own black hole.
  • Physicists figure out how to retrieve information from a black hole

    12/23/2015 1:17:47 PM PST · by Red Badger · 51 replies
    sciencemag.org ^ | 23 December 2015 3:15 pm | By Adrian Cho
    Black holes earn their name because their gravity is so strong not even light can escape from them. Oddly, though, physicists have come up with a bit of theoretical sleight of hand to retrieve a speck of information that's been dropped into a black hole. The calculation touches on one of the biggest mysteries in physics: how all of the information trapped in a black hole leaks out as the black hole "evaporates." Many theorists think that must happen, but they don't know how. Unfortunately for them, the new scheme may do more to underscore the difficulty of the larger...
  • Astronomy Picture of the Day -- Two Black Holes Dancing in 3C 75

    09/27/2014 9:50:48 PM PDT · by SunkenCiv · 22 replies
    NASA ^ | September 28, 2014 | (see photo credit)
    Explanation: What's happening at the center of active galaxy 3C 75? The two bright sources at the center of this composite x-ray (blue)/ radio (pink) image are co-orbiting supermassive black holes powering the giant radio source 3C 75. Surrounded by multimillion degree x-ray emitting gas, and blasting out jets of relativistic particles the supermassive black holes are separated by 25,000 light-years. At the cores of two merging galaxies in the Abell 400 galaxy cluster they are some 300 million light-years away. Astronomers conclude that these two supermassive black holes are bound together by gravity in a binary system in part...
  • Meet the Indian who took on Stephen Hawking

    08/02/2004 10:16:56 PM PDT · by CarrotAndStick · 97 replies · 5,002+ views
    Rediff.com ^ | August 03, 2004 10:06 IST | Rediff.com
    An Indian theoretical physicist who questioned the existence of black holes and thereby challenged Stephen Hawking of Britain at last feels vindicated. But he is sad. Abhas Mitra, at the Bhabha Atomic Research Centre (BARC) in Mumbai, was perhaps the first and the only scientist who had the guts to openly challenge Hawking of Cambridge University who is regarded by many as the modern-day Einstein. For over 30 years Hawking and his followers were perpetuating the theory that black holes -- resulting from gravitational collapse of massive stars -- destroy everything that falls into them preventing even light or information...
  • Stephen Hawking stuns physicists by declaring ‘there are no black holes’—says there are GREY ones

    01/25/2014 12:03:14 AM PST · by Olog-hai · 35 replies
    Daily Mail (UK) ^ | 15:59 EST, 24 January 2014 | Mark Prigg
    Stephen Hawking has shocked physicists by admitting “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...
  • A surge of attacks against classical GR (General Relativity)

    10/01/2014 1:02:17 PM PDT · by EveningStar · 9 replies
    The Reference Frame ^ | September 29, 2014 | Luboš Motl
    ... Well, even 90 years isn't enough, it seems, so right now, we are entering new waters – the denial of some basic results of general relativity, our modern theory of gravity that has been around and available to everyone since 1916. So in the last week, hundreds of publications informed their readers that it's been "mathematically proven" that the big bang theory is wrong and the black holes don't exist. These nutty claims boil down to some papers by a crackpot named Ms Laura Mersini-Houghton (no, I really, really won't accept her doctorate) who had previously claimed that she...
  • Astronomy Picture of the Day -- The View Near a Black Hole

    03/23/2014 4:38:43 AM PDT · by SunkenCiv · 17 replies
    NASA ^ | March 23, 2014 | (see photo credit)
    Explanation: In the center of a swirling whirlpool of hot gas is likely a beast that has never been seen directly: a black hole. Studies of the bright light emitted by the swirling gas frequently indicate not only that a black hole is present, but also likely attributes. The gas surrounding GRO J1655-40, for example, has been found to display an unusual flickering at a rate of 450 times a second. Given a previous mass estimate for the central object of seven times the mass of our Sun, the rate of the fast flickering can be explained by a black...
  • Astrophysicists duo propose Planck star as core of black holes

    02/17/2014 10:49:25 AM PST · by SunkenCiv · 21 replies
    Phys dot org ^ | February 14, 2014 | Bob Yirka
    The current thinking regarding black holes is that they have two very simple parts, an event horizon and a singularity. Because a probe cannot be sent inside a black hole to see what is truly going on, researchers have to rely on theories. The singularity theory suffers from what has come to be known as the "information paradox"—black holes appear to destroy information, which would seem to violate the rules of general relativity, because they follow rules of quantum mechanics instead. This paradox has left deep thinking physicists such as Stephen Hawking uneasy—so much so that he and others have...