Cyclotron emission effect on CMB spectral distortions

Burigana, C.; Zizzo, A.

doi:10.1002/asna.200610547

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…On the other hand, the cyclotron process is only relevant at very long wavelengths. Thus, for realistic shapes of distorted spectra and PMFs with amplitudes compatible with current constraints, the cyclotron contribution is found to be much less important than radiative Compton and bremsstrahlung contributions in re-establishing a blackbody spectrum (Burigana & Zizzo 2006) and also extremely small in generating a polarized signal (Zizzo & Burigana 2005). Thus, the current constraints derived from COBE-FIRAS present good prospects for possible future observations (Jedamzik et al 2000;Kunze & Komatsu 2014;Chluba et al 2015) while polarization anisotropies directly induced by PMFs are not significantly affected by the cyclotron process associated with PMFs.…”

Section: Imprints Of Primordial Magnetismmentioning

confidence: 65%

Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

Self Cite

309

107

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We compute and investigate four types of imprint of a stochastic background of primordial magnetic fields (PMFs) on the cosmic microwave background (CMB) anisotropies: the impact of PMFs on the CMB temperature and polarization spectra, which is related to their contribution to cosmological perturbations; the effect on CMB polarization induced by Faraday rotation; the impact of PMFs on the ionization history; magnetically-induced non-Gaussianities and related non-zero bispectra; and the magnetically-induced breaking of statistical isotropy. We present constraints on the amplitude of PMFs that are derived from different Planck data products, depending on the specific effect that is being analysed. Overall, Planck data constrain the amplitude of PMFs to less than a few nanoGauss, with different bounds that depend on the considered model. In particular, individual limits coming from the analysis of the CMB angular power spectra, using the Planck likelihood, are B 1 Mpc < 4.4 nG (where B 1 Mpc is the comoving field amplitude at a scale of 1 Mpc) at 95% confidence level, assuming zero helicity. By considering the Planck likelihood, based only on parity-even angular power spectra, we obtain B 1 Mpc < 5.6 nG for a maximally helical field. For nearly scale-invariant PMFs we obtain B 1 Mpc < 2.0 nG and B 1 Mpc < 0.9 nG if the impact of PMFs on the ionization history of the Universe is included in the analysis. From the analysis of magnetically-induced non-Gaussianity, we obtain three different values, corresponding to three applied methods, all below 5 nG. The constraint from the magnetically-induced passive-tensor bispectrum is B 1 Mpc < 2.8 nG. A search for preferred directions in the magneticallyinduced passive bispectrum yields B 1 Mpc < 4.5 nG, whereas the compensated-scalar bispectrum gives B 1 Mpc < 3 nG. The analysis of the Faraday rotation of CMB polarization by PMFs uses the Planck power spectra in EE and BB at 70 GHz and gives B 1 Mpc < 1380 nG. In our final analysis, we consider the harmonic-space correlations produced by Alfvén waves, finding no significant evidence for the presence of these waves. Together, these results comprise a comprehensive set of constraints on possible PMFs with Planck data.

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Section: Imprints Of Primordial Magnetismmentioning

confidence: 65%

Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

Self Cite

309

107

View full text Add to dashboard Cite

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Constraints on primordial magnetic fields from their impact on the ionization history with Planck 2018

Paoletti

Chluba

Finelli⋆

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We update and extend our previous CMB anisotropy constraints on primordial magnetic fields through their dissipation by ambipolar diffusion and MHD decaying turbulence effects on the post-recombination ionization history. We derive the constraints using the latest Planck 2018 data release which improves on the E-mode polarization leading to overall tighter constraints with respect to Planck 2015. We also use the low-multipole E-mode polarization likelihood obtained by the SROLL2 map making algorithm and we note how it is compatible with larger magnetic field amplitudes than the Planck 2018 baseline, especially for positive spectral indices. The 95 per cent CL constraints on the amplitude of the magnetic fields from the combination of the effects is $\sqrt{\langle B^2 \rangle } <0.69 (<0.72)$ nG for Planck 2018 (SROLL2) by marginalizing on the magnetic spectral index. We also investigate the impact of a damping scale allowed to vary and the interplay between the magnetic field effects and the lensing amplitude parameter.

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Improved CMB anisotropy constraints on primordial magnetic fields from the post-recombination ionization history

Paoletti

Chluba

Finelli⋆

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We investigate the impact of a stochastic background of Primordial Magnetic Fields (PMF) generated before recombination on the ionization history of the Universe and on the Cosmic Microwave Background radiation (CMB). Pre-recombination PMFs are dissipated during recombination and reionization via decaying MHD turbulence and ambipolar diffusion. This modifies the local matter and electron temperatures and thus affects the ionization history and Thomson visibility function. We use this effect to constrain PMFs described by a spectrum of power-law type extending our previous study (based on a scale-invariant spectrum) to arbitrary spectral index, assuming that the fields are already present at the onset of recombination. We improve previous analyses by solving several numerical issues which appeared for positively tilted PMFs indices. We derive upper bounds on the integrated amplitude of PMFs due to the separate effect of ambipolar diffusion and MHD decaying turbulence and their combination. We show that ambipolar diffusion is relevant for n B > 0 whereas for n B < 0 MHD turbulence is more important. The bound marginalized over the spectral index on the integrated amplitude of PMFs with a sharp cut-off is B 2 < 0.83 nG. We discuss the quantitative relevance of the assumptions on the damping mechanism and the comparison with previous bounds.

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Cyclotron emission effect on CMB spectral distortions

Cited by 3 publications

References 5 publications

Planck2015 results

Planck2015 results

Constraints on primordial magnetic fields from their impact on the ionization history with Planck 2018

Improved CMB anisotropy constraints on primordial magnetic fields from the post-recombination ionization history

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