Light millicharged particles and large scale cosmic magnetic fields
  After a brief review of different types of scenarios suggested for the solution of the problem of galactic and intergalactic magnetic field generation, the mechanism based on the electric current induction by hypothetical millicharged particles interacting with electrons in cosmic medium is discussed. The proposed model successfully describes observational data. The new light millicharged particles can contribute from a small fraction up to 100% to the cosmological dark matter. 
A.D. Dolgov
astro-ph.CO