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  • 1
    Electronic Resource
    Electronic Resource
    Quantum vacuum noise in physics and cosmology (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 11 (2001), S. 539-547 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The concept of the vacuum in quantum field theory is a subtle one. Vacuum states have a rich and complex set of properties that produce distinctive, though usually exceedingly small, physical effects. Quantum vacuum noise is familiar in optical and electronic devices, but in this paper I wish to consider extending the discussion to systems in which gravitation, or large accelerations, are important. This leads to the prediction of vacuum friction: The quantum vacuum can act in a manner reminiscent of a viscous fluid. One result is that rapidly changing gravitational fields can create particles from the vacuum, and in turn the backreaction on the gravitational dynamics operates like a damping force. I consider such effects in early universe cosmology and the theory of quantum black holes, including the possibility that the large-scale structure of the universe might be produced by quantum vacuum noise in an early inflationary phase. I also discuss the curious phenomenon that an observer who accelerates through a quantum vacuum perceives a bath of thermal radiation closely analogous to Hawking radiation from black holes, even though an inertial observer registers no particles. The effects predicted raise very deep and unresolved issues about the nature of quantum particles, the role of the observer, and the relationship between the quantum vacuum and the concepts of information and entropy. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1378796
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  • 2
    Electronic Resource
    Electronic Resource
    Primaeval magnetic monopoles (1979)
    [s.l.] : Nature Publishing Group
    Nature 277 (1979), S. 174-174 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] One of those curious apparent imper-fections of nature is the lopsidedness of electricity and magnetism. The world abounds with electric particles (all atoms are made of them) but nobody has ever seen a pure mag-netic particle. Magnetic fields can, it seems, only be produced by moving electricity, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/277174a0
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  • 3
    Electronic Resource
    Electronic Resource
    Timing time (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 290-292 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has been predicted for 60 years that time runs faster in space than on Earth. Now the prediction has been verified by a direct experiment in which a high-precision clock-an atomic hydrogen maser-was flown into space on board a spacecraft. In a recent issue of General Relativity and Gravitation, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279290b0
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical astrophysics (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 674-674 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Theoretical Principles in Astrophysics and Relativity offers yet another collection of papers from a conference, this one held in honour of Professor S. Chandrasekhar's 65th birthday in 1975. I found it a distinct improvement on the usual hotch-potch of disparate lectures re-hashed for the wider ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278674b0
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  • 5
    Electronic Resource
    Electronic Resource
    On falling through a black hole into another universe (1978)
    [s.l.] : Nature Publishing Group
    Nature 272 (1978), S. 35-37 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The black hole solutions which contain the feature under discussion have the causal structure indicated by the conformal Penrose diagram, Fig. 1. We restrict discussion to the Reissner-Nordstrom solution (non-rotating, electrically charged black hole) because its spherical symmetry simplifies the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/272035a0
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  • 6
    Electronic Resource
    Electronic Resource
    Cosmology and Quantum Electrodynamics (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 1102-1102 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The following is a brief outline of the $-matrix approach. The conventional perturbation expansion is modified in accordance with a suggestion made by Feynman7. The first term in the new expansion is examined. Contributions from all particles in the universe are included without reference to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2241102a0
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  • 7
    Electronic Resource
    Electronic Resource
    Primaeval heavy leptons (1977)
    [s.l.] : Nature Publishing Group
    Nature 269 (1977), S. 560-561 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DISCOVERIES in subatomic particle physics take place against a continual struggle for more technology and money. The Universe enjoys complete freedom from these worries and produces for free events which may tax human resources to the limit. During the big bang, exceedingly high temperatures and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/269560a0
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  • 8
    Electronic Resource
    Electronic Resource
    Experimenting with controlled gravity (1977)
    [s.l.] : Nature Publishing Group
    Nature 268 (1977), S. 397-398 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] OUR everyday experience of gravity is so pronounced that it is easy to forget what an incredibly weak force it really is. Only our proximity to a mass as large as the Earth enables terrestrial gravitational forces to compete with other forces of nature. By contrast, in the laboratory, gravity is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/268397a0
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  • 9
    Electronic Resource
    Electronic Resource
    Do black holes really explode? (1974)
    [s.l.] : Nature Publishing Group
    Nature 250 (1974), S. 37-38 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nevertheless, during the collapse of a spherically symmetric object, the metric near the surface will be changing rapidly on a time scale of T ~ 10-5 (M/M®) s, so that on general grounds the production of massless particles with energy of order h/? is expected. Many of these particles will escape ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/250037a0
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  • 10
    Electronic Resource
    Electronic Resource
    Ball Lightning or Spots before the Eyes ? (1971)
    [s.l.] : Nature Publishing Group
    Nature 230 (1971), S. 576-577 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Argyle attempts to explain ball lightning in terms of positive after-images, which have certain properties in common with the former. There seem to be two overriding objections to this conjecture. First, it is hard to understand the unanimity of description in cases where there have been many ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/230576c0
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