A Limit on Primordial Small-Scale Magnetic Fields from CMB Distortions

Details A Limit on Primordial Small-Scale Magnetic Fields from CMB Distortions A Limit on Primordial Small-Scale Magnetic Fields from CMB Distortions

1999-11-05

arxiv.org/abs/astro-ph/9911100v2

Phys.Rev.Lett. 85 (2000) 700-703

Astronomy and Astrophysics

Astrophysics

5 pages, accepted by Physical Review Letters

Scientific paper

10.1103/PhysRevLett.85.700

Spatially varying primordial magnetic fields may be efficiently dissipated prior to the epoch of recombination due to the large viscosity of the baryon-photon fluid. We show that this dissipation may result in observable chemical potential mu and Compton y distortions in the cosmic microwave background radiation (CMB) spectrum. Current upper limits on mu and y from FIRAS constrain magnetic fields to have strength B_0 < 3\times 10^{-8}Gauss (scaled to the present) between comoving coherence length \approx 400 pc and \approx 0.6 Mpc. This represents the strongest upper limit on small-scale primordial magnetic fields to date.

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