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

Abstract

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.

8 pages, no figures

References in corpus (8)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• TRIS II: search for CMB spectral distortions at 0.60, 0.82 and 2.5 GHz
• Detecting relic gravitational waves in the CMB: Optimal parameters and their constraints
• The V-mode polarization of the Cosmic Microwave Background
• TRIS III: the diffuse galactic radio emission at $\delta =+42^{\circ }$
• Circular dichroism, magnetic knots and the spectropolarimetry of the Cosmic Microwave Background

Cited by in corpus (9)

• Variable gravity: A suitable framework for quintessential inflation
• Unification of inflation and dark energy {\it à la} quintessential inflation
• A class of quintessential inflation models with parameter space consistent with BICEP2
• Circular Polarization of the CMB: A probe of the First stars
• Probing large-scale magnetism with the Cosmic Microwave Background
• Gradient expansion, curvature perturbations and magnetized plasmas
• Magnetization of fluid phonons and large-scale curvature perturbations
• Magnetic field contribution to the last electron-photon scattering
• Generation of CMB B-mode Polarization from Circular Polarization