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  • 1
    Electronic Resource
    Electronic Resource
    Abelian BF-theory and spherically symmetric electromagnetism (2000)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 41 (2000), S. 4313-4329 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Three different methods to quantize the spherically symmetric sector of electromagnetism are presented: First, it is shown that this sector is equivalent to Abelian BF-theory in four spacetime dimensions with suitable boundary conditions. This theory, in turn, is quantized by both a reduced phase space quantization and a spin network quantization. Finally, the outcome is compared with the results obtained in the recently proposed general quantum symmetry reduction scheme. In the magnetically uncharged sector, where all three approaches apply, they all lead to the same quantum theory. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.533344
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Group theoretical quantization and the example of a phase space S1×R+ (2000)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 41 (2000), S. 2537-2567 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The group theoretical quantization scheme is reconsidered by means of elementary systems. Already the quantization of a particle on a circle shows that the standard procedure has to be supplemented by an additional condition on the admissibility of group actions. A systematic strategy for finding admissible group actions for particular subbundles of cotangent spaces is developed, two-dimensional prototypes of which are T*R+ and S=S1×R+ (interpreted as restrictions of T*R and T*S1 to positive coordinate and momentum, respectively). In this framework (and under an additional, natural condition) an SO↑(1,2)-action on S results as the unique admissible group action. Furthermore, for symplectic manifolds which are (specific) parts of phase spaces with known quantum theory a simple "projection method" of quantization is formulated. For T*R+ and S equivalent results to those of more established (but more involved) quantization schemes are obtained. The approach may be of interest, e.g., in attempts to quantize gravity theories where demanding nondegenerate metrics of a fixed signature imposes similar constraints. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.533258
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cosmology Unique, or not unique? (2006)
    [s.l.] : Nature Publishing Group
    Nature 442 (2006), S. 988-990 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Whether 'tis nobler in the mind to suffer The slings and arrows of outrageous fortune, Or to take arms against a sea of troubles, And, by opposing, end them? Hamlet Act III, Scene i Hamlet's existential agony has always been, in a variant form, part of the mindset ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/442988a
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  • 4
    Electronic Resource
    Electronic Resource
    Cosmology Original questions (2005)
    [s.l.] : Nature Publishing Group
    Nature 436 (2005), S. 920-921 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Among the deepest, borderline-philosophical questions in modern physics is that of the origin and formation of the Universe. Earlier attempts to formulate an answer that takes into account existing theories and observations have failed because of obstacles posed by gravity. Mulryne et al., writing ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/436920a
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  • 5
    Book
    Book
    Zurück vor den Urknall / (2010)
    Frankfurt am Main :Fischer Taschenbuch,
    Details
    Title: Zurück vor den Urknall /
    Author: Bojowald, Martin
    Edition: überarb. Taschenbuchausg.
    Publisher: Frankfurt am Main :Fischer Taschenbuch,
    Year of publication: 2010
    Pages: 352 S. : , Ill., graph. Darst.
    ISBN: 978-3-596-18060-8
    Type of Medium: Book
    Language: German
    URL: 01 Inhaltstext
    URL: 07
    URL: 07
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    ZIB Catalog
    Zuse Institute Berlin get availability status
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