http://arxiv.org/abs/1702.01871
We present new limits on the amplitude of potential primordial magnetic fields (PMFs) using temperature and polarization measurements of the cosmic microwave background (CMB) from Planck, BICEP2/Keck Array, POLARBEAR, and SPT-pol. We reduce twofold the 95% CL upper limit on the CMB anisotropy power due to PMFs, from $A_{pmf}$ < 0.39 for Planck alone to $A_{pmf}$ < 0.22 for the combined dataset. We also forecast the expected limits from soon-to-deploy CMB experiments (like SPT-3G, Adv. ACTpol, or the Simons Array) and the proposed CMB-S4 experiment. Future CMB experiments should dramatically reduce the current uncertainties, by one order of magnitude for the near-term experiments and two orders of magnitude for the CMB-S4 experiment. The constraints from CMB-S4 have the potential to rule out much of the parameter space for PMFs.
D. Sutton, C. Feng and C. Reichardt
Wed, 8 Feb 17
30/65
Comments: Submitted to ApJ, 10 pages
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