The B-mode polarization of CMB and Cosmic Neutrino Background

Jafar Khodagholizadeh; Mahdi Sadegh; Rohoollah Mohammadi; She-Sheng Xue

The B-mode polarization of CMB and Cosmic Neutrino Background

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arxiv 1602.00237 v1 pith:RLSKUGEC submitted 2016-01-31 astro-ph.CO gr-qchep-ph

Rohoollah Mohammadi , Jafar Khodagholizadeh , Mahdi Sadegh , She-Sheng Xue This is my paper · ORCID

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keywords b-modepolarizationmetricscalartensorbackgroundcomptoncosmic

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abstract

It is known that in contrast with the E-mode polarization, the B-mode polarization of the Cosmic Microwave Background cannot be generated by the Compton scattering in the case of scalar mode of metric perturbation. However it is possible to generate the B-mode by the Compton scattering in the case of tensor mode of metric perturbation. For this reason, the ratio of tensor to scalar modes of metric perturbation ($r\sim C_{Bl}/C_{El}$) is estimated by comparing the B-mode power spectrum with the E-mode at least for small $l$. We study the CMB polarization specially B-mode due to the weak interaction of Cosmic Neutrino Background (CNB) and CMB, in addition to the Compton scattering in both cases of scalar and tensor metric perturbations. It is shown that the power spectrum $C_{Bl}$ of the B-mode polarization receives some contributions from scalar and tensor modes, which have effects on the value of $r$-parameter. We also show that the B-mode polarization power spectrum can be used as an indirect probe into the CNB.

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B-mode Power Spectrum of CMB via Polarized Compton Scattering
astro-ph.CO 2019-09 conditional novelty 5.0 of 10

Compton scattering off partially polarized electrons can generate B-mode polarization from scalar density perturbations, with an amplitude proportional to the square of the electron polarization asymmetry.

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