Galactic dynamo seeds from non-superconducting spin-polarised strings

Abstract

Earlier Enqvist and Olesen have shown that formation of ferromagnetic planar walls in vacuum at GUT scales in comoving plasmas may generate a large scale magnetic field of $B_{now}\simeq 10^{-14}G$. In this paper we show that starting from classical Einstein-Cartan-Maxwell strong gravity, a spin-polarised ferromagnetic cylinder gives rise to a cosmological magnetic field of the order $B_{now}\simeq 10^{-22}G$. Vorticity of cylinder is used to obtain galactic magnetic fields. Magnetic fields up to $B\sim 10^{9}G$ can be obtained from the spin density of the cylinder. If matching conditions are used cosmological magnetic fields of the order of $B\sim 10^{-16}R\frac{Gauss}{cm}$ where $R$ is the radius of the cosmic strings. For a cosmic string with the radius of an hydrogen atom the cosmic magnetic field is $B\sim 10^{-32}Gauss$ which is enough to seed galactic dynamos.

arXiv admin note: substantial text overlap with arXiv:gr-qc/0211072

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