2-6 September 2019
Europe/Zurich timezone

A Stringent Limit on Primordial Magnetic Fields from the Cosmic Microwave Background Radiation

4 Sep 2019, 17:00
25m
Talk CMB, Universe Expansion, and Thermal History Parallel Sessions: CMB, Expansion Rate, Thermal History (C.A.R.L., H09)

Speaker

Dr Karsten Jedamzik (University of Montpellier)

Description

Primordial Magnetic Fields (PMFs), being present before the epoch of cosmic recombination, induce small-scale baryonic density fluctuations. These inhomogeneities lead to an inhomogeneous recombination process which alters the peaks and heights of the large-scale anisotropies of the Cosmic Microwave Backround (CMB) radiation. Utilizing numerical compressible MHD calculations, and a Monte Carlo Markov Chain analysis, which compares calculated CMB anisotropies with those observed by the WMAP and Planck satellites, we derive limits on the magnitude of putative PMFs. We find that the total remaining present day field, integrated over all scales, cannot exceed 47 pG for scale-invariant PMFs and 8.9 pG for PMFs with a violet Batchelor spectrum at 95% confidence level. These limits are more than one order of magnitude more stringent than any prior stated limits on PMFs from the CMB which have not accounted for this effect.

Primary authors

Dr Karsten Jedamzik (University of Montpellier) Dr Andrey Saveliev (University of Kaliningrad)

Presentation Materials