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“School of Astronomy”

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Paper   IPM / Astronomy / 16279
School of Astronomy
  Title:   Circular polarization of cosmic photons due to their interactions with sterile neutrino dark matter
  Author(s): 
1.  M. Haghighat
2.  S. Mahmoudi
3.  R. Mohammadi
4.  S. Tizchang
5.  S. S Xue
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  101
  Year:  2020
  Supported by:            ipm IPM
  Abstract:
In this paper, we explore the possibility of the polarization conversion of a wide energy range of cosmic photons to the circular polarization through their interactions with right handed Sterile neutrinos as a candidate for dark matter. By considering the Sterile neutrino in the seesaw mechanism framework and right-handed current model, we examine the Faraday conversion ΔϕFC of gamma ray burst (GRB) photons at both the prompt and afterglow emission levels as well as the radio photons emitted from our galaxy and extra-galactic sources interacting with the Sterile neutrinos. Consequently, for the Sterile neutrino with mixing angle θ2≲10−2 motivated by models with a hidden sector coupled to the sterile neutrino, the Faraday conversion can be estimated as ΔϕFC≲10−3−10−18 rad for GRB, ΔϕFC≲10−6−10−11 rad for radio emission source from our galaxy and ΔϕFC≲10−6−10−15 rad for extra-galactic sources. We also examine the V-mode power spectrum CVl of the cosmic microwave background (CMB) at the last scattering surface. We show that the circular polarization power spectrum at the leading order is proportional to the linear polarization power spectrum Cpl and the mixing angle where for θ2≲10−2 leads to CVl≲0.01 Nano-Kelvin squared

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