Dynamics of a magnetized Bianchi I universe with vacuum energy

Details Dynamics of a magnetized Bianchi I universe with vacuum energy Dynamics of a magnetized Bianchi I universe with vacuum energy

2006-12-07

arxiv.org/abs/astro-ph/0612168v2

Class.Quant.Grav.24:2061-2072,2007

Astronomy and Astrophysics

Astrophysics

13 pages, 4 figures. Added references, corrected equations & extended discussion. To be published in CQG

Scientific paper

10.1088/0264-9381/24/8/008

We make use of a flat, axisymmetric Bianchi I metric to investigate the effects of a magnetic field upon the dynamics of the universe for the case in which the accompanying fluid is a cosmological constant and derive two exact solutions to the dynamical equations for this situation. We examine the behaviour of the scale factor perpendicular and parallel to the field lines, A(t) and W(t) respectively, and find the expected behaviour. The field has the strongest effect when A(t) is small, decelerating collapse perpendicular to the field lines, due to magnetic pressure, and accelerating collapse along the field lines, due to magnetic tension, while the vacuum energy dominates at late time, driving accelerated expansion.

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