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  • Other Sources  (3)
  • 1985-1989  (3)
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  • 1
    facet.materialart.
    Unknown
    Evolution of cosmic string networks (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Results on cosmic strings are summarized including: (1) the application of non-equilibrium statistical mechanics to cosmic string evolution; (2) a simple one scale model for the long strings which has a great deal of predictive power; (3) results from large scale numerical simulations; and (4) a discussion of the observational consequences of our results. An upper bound on G mu of approximately 10(-7) emerges from the millisecond pulsar gravity wave bound. How numerical uncertainties affect this are discussed. Any changes which weaken the bound would probably also give the long strings the dominant role in producing observational consequences.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-185467 , NAS 1.26:185467 , FERMILAB-PUB-89/140-A , PUPT-89-1133
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Evolution of cosmic string networks (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A discussion of the evolution and observable consequences of a network of cosmic strings is given. A simple model for the evolution of the string network is presented, and related to the statistical mechanics of string networks. The model predicts the long string density throughout the history of the universe from a single parameter, which researchers calculate in radiation era simulations. The statistical mechanics arguments indicate a particular thermal form for the spectrum of loops chopped off the network. Detailed numerical simulations of string networks in expanding backgrounds are performed to test the model. Consequences for large scale structure, the microwave and gravity wave backgrounds, nucleosynthesis and gravitational lensing are calculated.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-182836 , NAS 1.26:182836 , FERMILAB-PUB-89/42-A , PUPT-89-1119
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Small scale structure on cosmic strings (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The current understanding of cosmic string evolution is discussed, and the focus placed on the question of small scale structure on strings, where most of the disagreements lie. A physical picture designed to put the role of the small scale structure into more intuitive terms is presented. In this picture it can be seen how the small scale structure can feed back in a major way on the overall scaling solution. It is also argued that it is easy for small scale numerical errors to feed back in just such a way. The intuitive discussion presented here may form the basis for an analytic treatment of the small scale structure, which argued in any case would be extremely valuable in filling the gaps in the present understanding of cosmic string evolution.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-186075 , NAS 1.26:186075 , FERMILAB-CONF-89/221-A
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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