Cosmological magnetic field: a fossil of density perturbations in the early Universe

Details Cosmological magnetic field: a fossil of density perturbations in the early Universe Cosmological magnetic field: a fossil of density perturbations in the early Universe

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006asthe..99..568i&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 99, No. 10, p. 568 - 575 (2006)

Mathematics

Logic

Early Universe, Density Perturbations, Magnetic Fields, Galaxies

Scientific paper

The origin of magnetic fields in galaxies and in even larger scales is yet unclear. Here we show that cosmological density fluctuations, which are responsible for large scale structure of the universe, can naturally source magnetic fields at such large scales if we take the second order couplings into account. By explicitly calculating evolutions of peturbations numerically, we obtain the spectrum of magnetic fields at cosmological recombination. These magnetic fields can act as seed fields for galactic magnetic fields observed today.

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