Generation of circular polarization of CMB via polarized Compton scattering

Vahedi, Ali; Khodagholizadeh, Jafar; Mohammadi, Rohoollah; Sadegh, Mahdi

doi:10.1088/1475-7516/2019/01/052

Cited by 15 publications

(16 citation statements)

References 71 publications

(111 reference statements)

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“…In our previous work [67], we have shown that Compton scattering of photons from polarized electron 1 can generate circular polarization in contrast to the ordinary Compton scattering [68] but we have not investigated the generation of B-mode polarization due to polarized Compton scattering which is the mean aim of present work. In this paper, we will discuss the effect of the mentioned mechanism on the amplitude of the primordial gravitational waves (r-parameter) and…”

Section: Introductionmentioning

confidence: 91%

“…Such an approach have been studied in [68]. The Boltzmann equation for CMB polarization via ordinary and polarized Compton scattering is derived in [67], see also Appendix. In following, we just consider the equation for linear polarization which is given as…”

Section: Compton Scatteringmentioning

confidence: 99%

“…These motivated us to consider the generation of CMB circular polarization via polarized Compton scattering. Recently in [67] by straightforward calculating of the interacting Hamiltonian for photon-polarized electron scattering (e + γ −→ e + γ), the Boltzmann equation for ρ ij (x, k) in the first order of the interacting Hamiltonian is given…”

Section: Appendix: Cmb Interactions With Polarized Electronsmentioning

confidence: 99%

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B-mode power spectrum of CMB via polarized Compton scattering

Khodagholizadeh

Mohammadi

Sadegh

et al. 2020

J. Cosmol. Astropart. Phys.

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In this work, according to some evidence from being an asymmetry in the number density of left and right-handed electrons, δ L , in-universe motivate us to calculate the dominated contribution of this asymmetry in the generation of B-mode power spectrum C (S) B l . Note, in the standard cosmological scenario, Compton scattering in the presence of scalar matter perturbation can not generate magnetic like pattern in linear polarization while in the case of polarized Compton scattering, we have shown C (S) B l ∝ δ 2 L . We add up the spectrum of the B-mode generated by the polarized Compton scattering to the spectra produced by weak lensing effects and Compton scattering in the presence of tensor perturbations. The resultsshow a significant amplification in C B l in large scale l < 500 for δ L > 10 −6 which will be observable in future high resolution B-mode polarization detection. Finally, we have shown that C (S) B l 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 δ L > 10 −5 . PACS numbers: 13.15.+g, 98.80.Es, 98.70.Vc. a j.gholizadeh@cgu.ac.ir b rmohammadi@ipm.ir c m.sadegh@pnu.ac.ir d vahedi@khu.ac.ir,vahedi@ipm.ir2

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Section: Introductionmentioning

confidence: 91%

Section: Compton Scatteringmentioning

confidence: 99%

Section: Appendix: Cmb Interactions With Polarized Electronsmentioning

confidence: 99%

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B-mode power spectrum of CMB via polarized Compton scattering

Khodagholizadeh

Mohammadi

Sadegh

et al. 2020

J. Cosmol. Astropart. Phys.

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“…However, studies conducted in recent years show that the interaction between photons and matter can convert or generate the polarization states of photons in different situations. For instance, the linear polarization of the CMB photons can be converted to the circular one in the presence of background fields or due to the effects of particle scattering which has been widely discussed in the literature [19][20][21][22][23][24][25][26][27][28][29][30]. In this paper, we consider the DDM model with a singlet spin 1 2 fermion as DM particles to examine the effects of magnetic dipole moments on the CMB photon polarization.…”

Section: Introductionmentioning

confidence: 99%

Dipolar dark matter and CMB B-mode polarization

et al. 2020

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We consider dark matter particles as singlet fermionic particles carrying magnetic dipole moment to explore its contribution on the polarization of the cosmic microwave background (CMB) photons. We show that Dirac fermionic dark matter particles have no contribution on the CMB polarization. However, in the case of Majorana dark matter, this type of interaction leads to the B-mode polarization in the presence of primordial scalar perturbations which is in contrast with the standard scenario for the CMB polarization. We numerically calculate the B-mode power spectra and plot $$C_l^{BB}$$ClBB for different dark matter masses and the r-parameter. We show that dark matter particles with masses less than 100 MeV have a valuable contribution on $$C_l^{BB}$$ClBB. Meanwhile, dark matter particles with mass $$\text {m}_{\text {DM}}\le 50\, \text {MeV}$$mDM≤50MeV for $$r=0.07$$r=0.07 ( $$\text {m}_{\text {DM}}\le 80\, \text {MeV}$$mDM≤80MeV for $$r=0.09$$r=0.09) can be excluded experimentally. Furthermore, our results put a bound on the magnetic dipole moment about $$\text {M}\le 10^{-16} e\,\, \text {cm}$$M≤10-16ecm in agreement with the other reported constraints.

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“…These include primordial magnetic fields [30], polarized Compton scattering [31], primordial gravitational waves [32], Faraday conversion by external magnetized plasma [33,34], the magnetic field of the so called first stars [35], and, finally, different modifications and symmetry breaking mechanisms beyond the standard model [36,37]. In view of these, recently there has been considerable effort directed towards the determination of upper limits on the observation of circularly polarized CMB radiation [38,39].…”

Section: Introductionmentioning

confidence: 99%

Spin Hall effect of light in inhomogeneous axion field

Hoseini

Mehrafarin

2020

Physics Letters B

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We study the spin transport of light in weakly inhomogeneous axion field in a flat Robertson-Walker universe and derive the spin Hall effect for circularly polarized rays. Regarding primordial quantum fluctuations of the axion field in the de Sitter phase as the origin of the inhomogeneity, we show that the conformal invariance of the correlator determines the root-mean-square (r.m.s) fluctuations of the path of circularly polarized cosmic rays. We explain how the r.m.s fluctuations can be experimentally determined.

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Generation of circular polarization of CMB via polarized Compton scattering

Cited by 15 publications

References 71 publications

B-mode power spectrum of CMB via polarized Compton scattering

B-mode power spectrum of CMB via polarized Compton scattering

Dipolar dark matter and CMB B-mode polarization

Spin Hall effect of light in inhomogeneous axion field

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