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Paper   IPM / Astronomy / 16125
School of Astronomy
  Title:   B-mode power spectrum of CMB via polarized Compton scattering
1.  Jafar . Khodagholizadeh
2.  Rohoollah . Mohammadi
3.  Mahdi . Sadegh
4.  Ali . Vahedi
  Status:   Published
  Journal: JCAP
  Vol.:  2020
  Year:  2020
  Supported by:            ipm IPM
In this work, some evidences for existing an asymmetry in the density of left- and right-handed cosmic electrons (δL and δR respectively) in universe motivated us to calculate the dominated contribution of this asymmetry in the generation of the B-mode power spectrum. In the standard cosmological scenario, Compton scattering in the presence of scalar matter perturbation can not generate magnetic-like pattern in linear polarization CBl(S)=0 while in the case of polarized Compton scattering CBl(S)∝ δL2. By adding up the power spectrum of the B-mode generated by the polarized Compton scattering to power spectra produced by weak lensing effects and Compton scattering in the presence of tensor perturbations, we show that there is a significant amplification in CBl in large scale l<500 for δL>10−6, which can be observed in future experiments. Finally, we have shown that CBl(S) generated by polarized Compton scattering can suppress the tensor-to-scalar ratio (r-parameter) so that this contamination can be comparable to a primordial tensor-to-scalar ratio spatially for δL>10−5.

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