Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-02-19
Astron.Astrophys.326:13-22,1997
Astronomy and Astrophysics
Astrophysics
11 pages LaTeX using A&A macros v 3, no figures. Also available as gziped postscript at http://deneb.ugr.es/papers/bmf1.ps.gz
Scientific paper
We consider that no mean magnetic field exists during this epoch, but that there is a mean magnetic energy associated with large-scale magnetic inhomogeneities. We study the evolution of these inhomogeneities and their influence on the large scale density structure, by introducing linear perturbations in Maxwell equations, the conservation of momentum-energy equation, and in Einstein field equations. The primordial magnetic field structure is time independent in the linear approximation, only being diluted by the general expansion, so that $\vec{B}R^2$ is conserved in comoving coordinates. Magnetic fields have a strong influence on the formation of large-scale structure. Firstly, relatively low fields are able to generate density structures even if they were inexistent at earlier times. Second, magnetic fields act anisotropically more recently, modifying the evolution of individual density clouds. Magnetic flux tubes have a tendency to concentrate photons in filamentary patterns.
Battaner Eduardo
Florido Estrella
Jiménez-Vicente Jorge
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