The dynamics of spatially homogeneous, axisymmetric cosmological models with a primordial magnetic field

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Cosmology, Magnetic Fields, Space-Time Functions, Anisotropy, Electromagnetic Fields, Gravitational Collapse, Hyperbolic Coordinates, Vacuum

Scientific paper

All axisymmetric cosmological models with a primordial magnetic field are characterized by degenerate dynamics with no initial vacuum era and by particular matter-singularities due to the gravitation of matter. Several new forms of singularity having certain anisotropic point-collapse asymptotics complement the Lifshits-Khalatnikov classification. These are dominated by the gravitating P = n-epsilon fluid (where n is greater than or equal to zero and less than 1) together with the anisotropic space curvature for type VI(0) and Taub-NUT models or the stress-energy tensor of the electromagnetic field and ultrarelativistic-particle streams, especially if P is greater than epsilon/3.

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