D. Puy et P. Peter, PRIMORDIAL MAGNETIC-FIELD AND SPECTRAL DISTORTION OF COSMIC BACKGROUND-RADIATION, International journal of modern physics D, 7(3), 1998, pp. 489-498
The role played by a primordial magnetic field during the pre-recombin
ation epoch is analysed through the cyclotron radiation (due to the fr
ee electrons) it might produce in the primordial plasma. We discuss th
e constraint implied by the measurement or lack thereof COBE on this p
rimordial field.