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Keyword: quantummechanics

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  • Black holes 'do not exist'

    03/31/2005 4:41:46 PM PST · by Michael_Michaelangelo · 84 replies · 3,300+ views
    Nature ^ | 03/31/05 | Philip Ball
    Black holes are staples of science fiction and many think astronomers have observed them indirectly. But according to a physicist at the Lawrence Livermore National Laboratory in California, these awesome breaches in space-time do not and indeed cannot exist. Over the past few years, observations of the motions of galaxies have shown that some 70% the Universe seems to be composed of a strange 'dark energy' that is driving the Universe's accelerating expansion. George Chapline thinks that the collapse of the massive stars, which was long believed to generate black holes, actually leads to the formation of stars that contain...
  • Natural selection acts on the quantum world

    12/23/2004 8:31:39 AM PST · by PatrickHenry · 74 replies · 1,153+ views
    Nature Magazine ^ | 23 December 2004 | Philip Ball
    Objective reality may owe its existence to a 'darwinian' process that advertises certain quantum states. A team of US physicists has proved a theorem that explains how our objective, common reality emerges from the subtle and sensitive quantum world. If, as quantum mechanics says, observing the world tends to change it, how is it that we can agree on anything at all? Why doesn't each person leave a slightly different version of the world for the next person to find? Because, say the researchers, certain special states of a system are promoted above others by a quantum form of natural...
  • About Those Fearsome Black Holes? Never Mind

    07/22/2004 9:17:06 PM PDT · by neverdem · 30 replies · 854+ views
    NY Times ^ | July 22, 2004 | DENNIS OVERBYE
    Dr. Stephen W. Hawking threw in the towel yesterday, or at least an encyclopedia. Dr. Hawking, the celebrated Cambridge University cosmologist and best-selling author, declared at a scientific conference in Dublin that he had been wrong in a controversial assertion he made 30 years ago about black holes, the fearsome gravitational abysses that can swallow matter and energy, even light. As atonement he presented Dr. John Preskill, a physicist from the California Institute of Technology, with a baseball encyclopedia. The encyclopedia was the stake in a famous bet Dr. Hawking and another Caltech physicist, Dr. Kip Thorne, made with Dr....
  • Time Trip - questions and answers (How widely accepted is the theory that we can travel in time?)

    12/25/2003 8:12:15 PM PST · by Momaw Nadon · 91 replies · 2,512+ views
    BBC ^ | Friday, December 26, 2003 | BBC
    The Future According to Professor Paul Davies "Scientists have no doubt whatever that it is possible to build a time machine to visit the future". Since the publication of Einsteinís Special Theory of Relativity in 1905, few, if any, scientists would dispute that time travel to the future is perfectly possible. According to this theory, time runs slower for a moving person than for someone who is stationary. This has been proven by experiments using very accurate atomic clocks. In theory, a traveller on a super high-speed rocket ship could fly far out into the Universe and then come back...
  • "Exact uncertainty" brought to quantum world

    05/07/2002 11:50:28 AM PDT · by sourcery · 32 replies · 169+ views ^ | April 02 | Eugenie Samuel
    † † "Exact uncertainty" brought to quantum world † 00:01†27†April†02 † Exclusive from New Scientist Print Edition † Exact uncertainty sounds like a contradiction in terms, but that is what governs the quantum world, according to a theoretical physicist who has created an improved version of the famous Heisenberg uncertainty principle. Heisenberg worked out that there is a degree of inherent fuzziness to the world. You cannot measure both the position and the momentum of any particle with perfect accuracy. The better the accuracy of your momentum measurement, the more uncertain your position measurement must be, and vice versa....
  • Is God In Time?

    04/18/2002 9:22:22 PM PDT · by P-Marlowe · 4 replies · 99+ views
    Stand to Reason ^ | 1995 | Gregory Koukl
    Is God In Time? Gregory Koukl † Is it possible that all of history is one big space-time manifold--a "block universe"? Put your thinking caps on today. We're going to talk about time. It's common for us to make the comment "The spaceless, timeless God" or "Then we'll pass out of time, into eternity." However, the Scripture is not clear about God's timelessness. Most of the verses seem to indicate God is in time: Rev 1:4; Rev 4:8, Ps 90, Jude 25, 2 Pet 3:8. Two popular books describe a picture of God as timeless. Philip Yancey's book Disappointment...