On the effect of cyclotron emission on the spectral distortions of the cosmic microwave background

Zizzo, A.; Burigana, C.

doi:10.1016/j.newast.2005.05.003

Cited by 14 publications

(14 citation statements)

References 34 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: 53%

Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

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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: 53%

Planck2015 results

Ade

Aghanim

Arnaud

et al. 2016

A&A

Self Cite

309

107

View full text Add to dashboard Cite

show abstract

“…We corrected here an erroneous multiplicative factor 2 included in all the rates plotted in Figs. 2 and 3 of Zizzo & Burigana (2005) because of a typo only in the corresponding IDL visualization procedure). between matter and radiation or associated to photon injections at ν significantly different from ν c , the role of CE in the evolution of CMB spectral distortions is negligible for cosmic MF realistic values.…”

Section: Resultsmentioning

confidence: 99%

Cyclotron emission effect on CMB spectral distortions

Burigana¹,

Zizzo

2006

Astron Nachr

Self Cite

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Abstract.We investigated the role of the cyclotron emission (CE) associated to cosmic magnetic fields (MF) on the evolution of cosmic microwave background (CMB) spectral distortions. We computed the photon and energy injection rates by including spontaneous and stimulated emission and absorption. These CE rates have been compared with those of bremsstrahlung (BR) and double Compton scattering (DC), for realistic CMB distorted spectra at various cosmic epochs. For reasonable MF strengths we found that the CE contribution to the evolution of the CMB spectrum is much smaller than the BR and DC contributions. The constraints on the energy exchanges at various redshifts can be then derived, under quite general assumptions, by considering only Compton scattering (CS), BR, and DC, other than the considered dissipation process. Upper limits to the CMB polarization degree induced by CE have been estimated.

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“…According to [123] the damping of pre-decoupling magnetic fields does lead to µ and y distortions. By imposing the COBE/FIRAS limit we do get a limit on the magnetic field intensity of the order of 3 × 10 −8 between comoving coherence length 400 pc and 0.6 Mpc (see also [124,125]). More recently the hopes for new CMB experiments with improved sensitivities to distortions stimulated various reprises of these themes [126].…”

Section: Spectral Distortions?mentioning

confidence: 99%

Probing large-scale magnetism with the cosmic microwave background

Giovannini

2018

Class. Quantum Grav.

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Prior to photon decoupling magnetic random fields of comoving intensity in the nano-Gauss range distort the temperature and the polarization anisotropies of the microwave background, potentially induce a peculiar B-mode power spectrum and may even generate a frequency-dependent circularly polarized V -mode. We critically analyze the theoretical foundations and the recent achievements of an interesting trialogue involving plasma physics, general relativity and astrophysics.

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On the effect of cyclotron emission on the spectral distortions of the cosmic microwave background

Cited by 14 publications

References 34 publications

Planck2015 results

Planck2015 results

Cyclotron emission effect on CMB spectral distortions

Probing large-scale magnetism with the cosmic microwave background

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