Primordial Magnetic Fields with the WMAP and Planck Satellite Experiments

Details Primordial Magnetic Fields with the WMAP and Planck Satellite Experiments Primordial Magnetic Fields with the WMAP and Planck Satellite Experiments

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..36..236a&link_type=abstract

Magnetic Fields in the Universe II: From Laboratory and Stars to the Primordial Universe - Supplementary CD (Eds. A. Esquivel, J

Astronomy and Astrophysics

Astronomy

Cosmic Microwave Background, Cosmology: Observations, Magnetic Fields

Scientific paper

We present a study of Faraday rotation of the Cosmic Microwave Background (CMB) polarization anisotropies by a large scale primordial magnetic field (PMF) present at the time of decoupling. We assume weak intensity for the PMF, of the order of a nG nowadays, and tight coupling between photons, electrons and baryons around recombination. Under these hypotheses and considering no tensor perturbations, the equations of evolution of the CMB polarization lead to the direct generation of B polarization modes from the E modes generated by scalar perturbations. We are able to produce simulated CMB maps including this effect for a wide range of geometries of the PMF. From these simulations we extract the modified polarization angular power spectra and the results are compared to an analytic approach showing that our hypothesis leads to the same order of magnitude signature on the CMB CℓBB spectrum. Finally, we obtain an upper limit on the today intensity of the PMF, B_0 ≲ 27 nG (95% CL), by comparing our models to the CℓTE spectrum measured by WMAP.

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