Cosmic-string-induced hot dark matter perturbations

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168471· OSTI ID:6851369

Van Dalen, A ^[1]

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1. NASA/Fermilab Astrophysics Center, Batavia, IL (USA) Chicago Univ., IL (USA)

This 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. 32 refs.

• OSTI ID: 6851369
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 351; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
COMPOSITE MODELS
COSMOLOGY
DENSITY
ELEMENTARY PARTICLES
ENERGY RANGE
EXTENDED PARTICLE MODEL
FERMIONS
FLUCTUATIONS
GALAXY CLUSTERS
HADRONS
HUBBLE EFFECT
MASS
MATHEMATICAL MODELS
NONLUMINOUS MATTER
PARTICLE MODELS
PHYSICAL PROPERTIES
QUARK MODEL
RELATIVISTIC RANGE
STRING MODELS
UNIVERSE
VARIATIONS