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Cosmic-string-induced hot dark matter perturbationsThis paper investigates the evolution of initially relativistic matter, radiation, and baryons around cosmic string seed perturbations. A detailed analysis of the linear evolution of spherical perturbations in a universe is carried out, and this formalism is used to study the evolution of perturbations around a sphere of uniform density and fixed radius, approximating a loop of cosmic string. It was found that, on scales less than a few megaparsec, the results agree with the nonrelativistic calculation of previous authors. On greater scales, there is a deviation approaching a factor of 2-3 in the perturbation mass. It is shown that a scenario with cosmic strings, hot dark matter, and a Hubble constant greater than 75 km/sec per Mpc can generally produce structure on the observed mass scales and at the appropriate time: 1 + z = about 4 for galaxies and 1 + z = about 1.5 for Abell clusters.
Document ID
19900038834
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Van Dalen, Anthony
(NASAFermilab Astrophysics Center Batavia; Chicago, University, IL, United States)
Date Acquired
August 14, 2013
Publication Date
March 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 351
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A25889
Funding Number(s)
CONTRACT_GRANT: NSF AST-85-15447
Distribution Limits
Public
Copyright
Other

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