Generation of Cosmic Magnetic Fields at Recombination
| dc.creator | Hogan, Craig J. | |
| dc.date | 2000-05-18 | |
| dc.date | 2000-05-23 | |
| dc.date.accessioned | 2026-07-07T01:53:39Z | |
| dc.date.available | 2026-07-07T01:53:39Z | |
| dc.description | It is shown that the standard cosmological model predicts {\it ab initio} generation of large-scale but very small-amplitude cosmic magnetic fields at the epoch of recombination of the primeval plasma. Matter velocities dominated by coherent flows on a scale $L\approx 50h^{-1}(1+z)^{-1}$ Mpc lead to a dipole of radiation flux in the frame of the moving matter. Thomson scattering of the radiation differentially accelerates the electrons and ions, creating large-scale coherent electric currents and magnetic fields. This process is analyzed using magnetohydrodynamic equations which include a modification of Ohm's law describing the effect of Thomson drag on the electrons. The field strength is estimated to be $B\simeq 10^{-20}$G. | |
| dc.description | 6 pages, AAS Latex. The amplitude of the generated field is much smaller than estimated in the original version, due to slow growth rate of B by induction | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0005380 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0005380 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1038 | |
| dc.subject | Astrophysics | |
| dc.title | Generation of Cosmic Magnetic Fields at Recombination | |
| dc.type | text |