Large-scale magnetic fields: galaxy two-point correlation function

We study the effect of large-scale tangled magnetic fields on the galaxy two-point correlation function in the redshift space. We show that (i) the magnetic field effects can be comparable to the gravity-induced clustering for present magnetic field strength B₀≃ 5 × 10⁻⁸ G, (ii) the absence of this signal from the present data gives an upper bound B₀≲ 3 × 10⁻⁸ G and (iii) the future data can probe the magnetic fields of ≃10⁻⁸ G. A comparison with other constraints on the present magnetic field shows that they are marginally compatible. However, if the magnetic fields corresponding to B₀≃ 10⁻⁸ G existed at the last scattering surface, they will cause unacceptably large cosmic microwave background radiation anisotropies.