Constraining primordial magnetic fields with CMB polarization experiments

Details Constraining primordial magnetic fields with CMB polarization experiments Constraining primordial magnetic fields with CMB polarization experiments

2008-03-21

arxiv.org/abs/0803.3210v2

Phys.Rev.D77:123004,2008

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures. Extended results section. Typos corrected. Corresponds to version accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.77.123004

We calculate the effect that a primordial homogeneous magnetic field, $\B_0$, will have on the different CMB power spectra due to Faraday rotation. Concentrating on the $TB$, $EB$ and $BB$ correlations, we forecast the ability for future CMB polarization experiments to constrain $\B_0$. Our results depend on how well the foregrounds can be subtracted from the CMB maps, but we find a predicted error between $\sigma_{\B_0} = 4 \times 10^{-11}$Gauss (for the QUIET experiment with foregrounds perfectly subtracted) and $3 \times 10^{-10}$Gauss (with the Clover experiment with no foreground subtraction). These constraints are two orders of magnitudes better than the present limits on $\B_0$.

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