Zero-curvature Friedmann-Robertson-Walker models as exact viscous magnetohydrodynamic cosmologies

Journal Article · Mon Aug 01 00:00:00 EDT 1983 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/161169· OSTI ID:5668037

Coley, A A; Tupper, B O.J.

It is shown that FRW cosmologies, in particular the zero-curvature models,do not necessarily represent perfect fluid solutions but also can be exact solutions of the field equations for a viscous fluid, with or without an electromagnetic field, and that these solutions can be physically acceptable. The viscous, magnetohydrodynamic model with metric identical to that of the perfect fluid model with equation of state p-bar = ..gamma..rho-bar is investigated and particular attention is given to the Einstein-de Sitter model which corresponds to ..gamma.. = 0. The behavior of the expansion of the velocity congruence in the viscous interpretation is quite different from that of the standard model, which suggests that the usual treatment of the critical density problem may be questionable.

• Research Organization: Department of Mathematics and Statistics, University of New Brunswick, Fredericton, New Brunswick
• OSTI ID: 5668037
• Journal Information: Astrophys. J.; (United States), Vol. 271:1
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMOLOGICAL MODELS
GENERAL RELATIVITY THEORY
MAGNETOHYDRODYNAMICS
COSMOLOGY
ELECTROMAGNETIC FIELDS
EQUATIONS OF STATE
FIELD EQUATIONS
METRICS
VISCOSITY
EQUATIONS
FIELD THEORIES
FLUID MECHANICS
HYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
640106* - Astrophysics & Cosmology- Cosmology