Detecting relic gravitational waves in the CMB: The contamination caused by the cosmological birefringence

Detecting relic gravitational waves in the CMB: The contamination caused by the cosmological birefringence

Blog Article

The B-mode polarization of the cosmic microwave RIAA Turntable Preamplifier background (CMB) radiation is an excellent information channel for the detection of relic gravitational waves.However, the detection is contaminated by the B-mode polarization generated by some other effects.In this paper, we discuss the contaminations caused by the cosmological birefringence, which converts the CMB E-mode to the B-mode, and forms the effective noise for the detection of gravitational waves.We find that this contamination is significant, if the rotation angle is large.

However, this kind of B-mode can be properly de-rotated, and the effective noises can be greatly reduced.We find that, comparing with the contaminations caused by cosmic weak lensing, the residual polarization BIO FATS OMEGA 3-6-9 generated by the cosmological birefringence is negligible for the detection of relic gravitational waves in the CMB.