1201.4371 (M. S. Pshirkov et al.)

Picogauss magnetic fields in voids from ultra-high energy cosmic rays    [PDF]

M. S. Pshirkov, P. G. Tinyakov

We argue that ultra-high energy cosmic rays emitted by galaxy clusters result in electric currents in filaments of the large-scale structure that are sufficient to generate magnetic fields in voids of the magnitude of ~1e-12 G and the coherence length of up to tens of Mpc. These fields satisfy both the lower and upper observational bounds on magnetic fields in voids without a need of any primordial component.

View original: http://arxiv.org/abs/1201.4371