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  • Other Sources  (7)
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  • 1
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    Axions and the evolution of structure in the universe (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A cosmological scenario where axions provide the dark matter in the universe is considered. Fluctuations in the axion-field energy denisty produced by domain walls and strings cause the appearance of 'axion clumps' of masses of order 10 to the 6th solar masses which most likely collapse to black holes by or at the time that the universe becomes axion dominated at T approximately 10 eV. These objects form the building blocks for the clustering hierarchy theory of galaxy and supercluster formation on scales up to about 10 Mpc and 10 to the 15th solar masses.
    Keywords: ASTROPHYSICS
    Type: Physical Review Letters; 50; Mar. 21
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Implications of a class of grand-unified theories for large-scale structure in the universe (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A class of grand-unified theories in which cosmologically significant axion and neutrino energy densities arise naturally is considered. To obtain large-scale structure, attention is given to (1) an inflationary scenario, (2) inflation followed by string production, and (3) a noninflationary scenario with density fluctuations caused solely by strings. It is shown that inflation may be compatible with the recent observational indications that Omega less than 1 on the scale of superclusters, particularly if strings are present.
    Keywords: ASTROPHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 53; 1292-129
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Axions and the dark matter of the universe (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Spin(10) axion models are constructed which offer the possibility that axions comprise all or a significant part of the dark matter of the Universe.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA-TM-84939 , NAS 1.15:84939
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Density fluctuations from strings and galaxy formation (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The spectra of density fluctuations caused by strings in a universe dominated either by baryons, neutrinos, or axions are presented. Realistic scenarios for galaxy formation seem possible in all three cases. Examples of grand unified theories which lead to strings with the desired mass scales are given.
    Keywords: ASTROPHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 51; 1716-171
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    NASA TECHNICAL REPORTS
  • 5
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    Implications of a class of grand unified theories for large scale structure in the universe (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A class of grand unified theories in which cosmologicaly significant axion and neutrino energy densities arise naturally is discussed. To obtain large scale structure three scenarios are considered: (1) an inflationary scenario; (2) inflation followed by string production; and (3) a non-inflationary scenario with density fluctuations caused solely by strings. Inflation may be compatible with the recent observational indications that mega 1 on the scale of superclusters, particularly if strings are present.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-86146 , NAS 1.15:86146
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    The need for an intermediate mass scale in GUTs (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The minimal SU(5) grand unified field theory (GUT) model fails to resolve the strong charge parity (CP) problem, suffers from the cosmological monopole problem, sheds no light on the nature of the 'dark' mass in the universe, and predicts an unacceptably low value for the baryon asymmetry. All these problems can be overcome in suitable grand unified axion models with an intermediate mass scale of about 10 to the 11th power to 10 to the 12th power GeV. An example based on the gauge group SO(10) is presented. Among other things, it predicts that the axions comprise the 'dark' mass in the universe, and that there exists a galactic monopole flux of 10 to the -8th power to 10 to the -7th power/sq cm/yr. Other topics that are briefly discussed include proton decay, family symmetry, neutrino masses and the gauge hierarchy problem.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-85039 , NAS 1.15:85039 , REPT-665 , Europhy. Study Conf. on Electroweak Effects at High Energies; Feb 01, 1983 - Feb 28, 1983; Erice, Sicily; Italy
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  • 7
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    The evolution of structure in the universe from axions (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A scenario where axions provide the dark matter in the universe is considered. Fluctuations in the axion field density produced by domain walls and strings cause the appearance of axion clumps of masses of order 10 to the 6th power solar mass which most likely collapse to black holes by or at the time that the universe becomes axion dominated at T is approximately 10 eV. These objects form the building blocks for a clustering hierarchy theory of galaxy and supercluster formation on scales up to approximately 10 Mpc and approximately 10 to the 15th power solar mass.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-84963 , NAS 1.15:84963 , REPT-660
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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