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Magnetohydrodynamic perturbations of Robertson-Walker universes and of anisotropic Bianchi type-I universesMagnetohydrodynamic (MHD) perturbations in flat Robertson-Walker universes were analyzed, emphasizing their effects on galaxy formation. The Newtonian approximation is used. There is no increase in the growth rates beyond those of the usual perturbed Robertson-Walker models; the MHD modes extract as much energy as they contribute. Some global properties of fully MHD Bianchi I relativistic models are analyzed including vorticity, fluid accelerations, and dissipative effects. The time dependence of perturbations of a fully MHD diagonal Bianchi I cosmology is studied, with an enhanced growth rate of the density contrast of t found which is still not exponential Jeans-type growth. This indicates that a more detailed analysis is needed if a solution to the galaxy formation problem in MHD cosmologies is to be found.
Document ID
19810035289
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fennelly, A. J.
(NASA Marshall Space Flight Center Huntsville, Ala.; Western Kentucky, University, Bowling Green, Ky., United States)
Evans, C. R.
(Western Kentucky, University Bowling Green, Ky., United States)
Date Acquired
August 11, 2013
Publication Date
November 11, 1980
Publication Information
Publication: Nuovo Cimento B
Subject Category
Astrophysics
Accession Number
81A19693
Distribution Limits
Public
Copyright
Other

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