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B-mode polarization of the CMB and the cosmic neutrino background

Rohoollah Mohammadi1,*, Jafar Khodagholizadeh2,†, M. Sadegh3, and She-Sheng Xue4,‡

  • 1Iran Science and Technology Museum (IRSTM), P.O. Box 11369-14611, Tehran, Iran
  • 2Shahid Beheshti Bracnch, Farhangian University, P.O. Box 11876-13311, Tehran, Iran
  • 3Department of Physics, Payame Noor University (PNU), P.O. Box 19359-3697, Tehran, Iran
  • 4ICRANet, P.zza della Repubblica 10, I–65122 Pescara, Italy and Physics Department, University of Rome La Sapienza, P.le Aldo Moro 5, I–00185 Rome, Italy

  • *mohammadi0692@gmail.com
  • †gholizadeh@ipm.ir
  • ‡xue@icra.it
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Phys. Rev. D 93, 125029 – Published 23 June, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.125029

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 the scalar mode of metric perturbation. However, it is possible to generate the B mode by the Compton scattering in the case of the tensor mode of metric perturbation. For this reason, the ratio of tensor to scalar modes of metric perturbation (r∼CBl/CEl) is estimated by comparing the B-mode power spectrum with the E mode at least for small l. We study the cosmic microwave background polarization, especially the B mode due to the weak interaction of the cosmic neutrino background and cosmic microwave background, in addition to the Compton scattering in both cases of scalar and tensor metric perturbations. It is shown that the power spectrum CBl of the B-mode polarization receives some contributions from scalar and tensor modes, which have effects on the value of the r parameter. We also show that the B-mode polarization power spectrum can be used as an indirect probe into the cosmic neutrino background.

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Phys. Rev. D 93, 125029– Published 23 June, 2016
  • Received 30 January 2016
Article part of CHORUS

© 2016 American Physical Society

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