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Learn how you can make a cool invisible infra red mask to hide your face from cameras anywhere And look perfectly normal to the human eye! Можно ли фотографировать людей в Америке? В последнее время часто встречаю в жж комменты о. 27/11/ · Expert news, reviews and videos of the latest digital cameras, lenses, accessories, and phones. Get answers to your questions in our photography forums. ПРИЗНАВАНЕ НА ЧУЖДЕСТРАННИ СЪДЕБНИ АКТОВЕ Формуляри ЗАЯВЛЕНИЕ по чл. , ал. 1 от Кодекса за. 21/02/ · Physicists insist on determinism: your past and present determine your future uniquely, per Einstein's equations of general relativity. They call this Credit: APS/Alan Stonebraker.

Some black holes erase your past

In the real world, your past uniquely determines your future. If a physicist knows how the universe starts out, she can calculate its future for all time and all space.

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  • But a UC Berkeley mathematician has found some types of black holes in which this law breaks down. If someone were to venture into one of these relatively benign black holes, they could survive, but their past would be obliterated and they could have an infinite number of possible futures. Such claims have been made in the past, and physicists have invoked "strong cosmic censorship" to explain it away.

    That is, something catastrophic -- typically a horrible death -- would prevent observers from actually entering a region of spacetime where their future was not uniquely determined.

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    This principle, first proposed 40 years ago by physicist Roger Penrose, keeps sacrosanct an idea -- determinism -- key to any physical theory. That is, given the past and present, the physical laws of the universe do not allow more than one possible future.

    Einstein's equations allow a non-determinist future inside some black holes

    But, says UC Berkeley postdoctoral fellow Peter Hintz, mathematical calculations show that for some specific types of black holes in a universe like ours, which is expanding at an accelerating rate, it is possible to survive the passage from a deterministic world into a non-deterministic black hole. What life would be like in a space where the future was unpredictable is unclear.

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  • This is a math question. As quoted by Physics World, Gary Horowitz of UC Santa Barbara, who was not involved in the research, said that the study provides "the best evidence I know for a violation of strong cosmic censorship in a theory of gravity and electromagnetism.

    Hintz and his colleagues published a paper describing these unusual black holes last month in the journal Physical Review Letters. Black holes are bizarre objects that get their name from the fact that nothing can escape their gravity, not even light.

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    But for large black holes, like the supermassive objects at the cores of galaxies like the Milky Way, which weigh tens of millions if not billions of times the mass of a star, crossing the event horizon would be, well, uneventful.

    These equations work well until an observer reaches the center or singularity, where in theoretical calculations the curvature of spacetime becomes infinite. Even before reaching the center, however, a black hole explorer -- who would never be able to communicate what she found to the outside world -- could encounter some weird and deadly milestones. Hintz studies a specific type of black hole -- a standard, non-rotating black hole with an electrical charge -- and such an object has a so-called Cauchy horizon within the event horizon.

    The Cauchy horizon is the spot where determinism breaks down, where the past no longer determines the future.

    Physicists, including Penrose, have argued that no observer could ever pass through the Cauchy horizon point because they would be annihilated. As the argument goes, as an observer approaches the horizon, time slows down, since clocks tick slower in a strong gravitational field.

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    As light, gravitational waves and anything else encountering the black hole fall inevitably toward the Cauchy horizon, an observer also falling inward would eventually see all this energy barreling in at the same time.

    In effect, all the energy the black hole sees over the lifetime of the universe hits the Cauchy horizon at the same time, blasting into oblivion any observer who gets that far. Hintz realized, however, that this may not apply in an expanding universe that is accelerating, such as our own.

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    In fact, the energy available to fall into the black hole is only that contained within the observable horizon: the volume of the universe that the black hole can expect to see over the course of its existence.

    For us, for example, the observable horizon is bigger than the The accelerating expansion of the universe will prevent us from seeing beyond a horizon of about In that scenario, the expansion of the universe counteracts the amplification caused by time dilation inside the black hole, and for certain situations, cancels it entirely.

    However, the mathematical solutions for charged black holes are used as proxies for what would happen inside rotating black holes, which are probably the norm. Hintz argues that smooth, rotating black holes, called Kerr-Newman-de Sitter black holes, would behave the same way.

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  • He discovered these types of black holes by teaming up with Cardoso and his colleagues, who calculated how a black hole rings when struck by gravitational waves, and which of its tones and overtones lasted the longest. In some cases, even the longest surviving frequency decayed fast enough to prevent the amplification from turning the Cauchy horizon into a dead zone.

    But Hintz insists that one instance of violation is one too many. Materials provided by University of California - Berkeley.

    Note: Content may be edited for style and length. Science News. Beyond the event horizon Black holes are bizarre objects that get their name from the fact that nothing can escape their gravity, not even light.

    Quasinormal Modes and Strong Cosmic Censorship. ScienceDaily, 21 February University of California - Berkeley. Retrieved June 25, from www. Below are relevant articles that may interest you.

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