Cosmological Magnetic Field: A Fossil of Density Perturbations in the Early Universe
Cosmological Magnetic Field: A Fossil of Density Perturbations in the Early Universe
The origin of the substantial magnetic fields that are found in galaxies and on even larger scales, such as in clusters of galaxies, is yet unclear. If the second-order couplings between photons and electrons are considered, then cosmological density fluctuations, which explain the large-scale structure of the universe, can also …