Last scattering, relic gravitons and the circular polarization of the CMB

Details Last scattering, relic gravitons and the circular polarization of the CMB Last scattering, relic gravitons and the circular polarization of the CMB

2010-01-23

arxiv.org/abs/1001.4172v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, no figures

Scientific paper

The tensor contribution to the $V$-mode polarization induced by a magnetized plasma at last scattering vanishes exactly. Conversely a polarized background of relic gravitons cannot generate a $V$-mode polarization. The reported results suggest that, in the magnetized $\Lambda$CDM paradigm, the dominant source of circular dichroism stems from the large-scale fluctuations of the spatial curvature.

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