Magnetogenesis and the Cosmic Web: a joint challenge for radio observations and numerical simulations

Vazza, Franco; Locatelli, Nicola; Rajpurohit, K.; Banfi, Serena; Domínguez-Fernández, Paola; Wittor, Denis; Angelinelli, M.; Inchingolo, Giannandrea; Brienza, M.; Hackstein, Stefan; Dallacasa, D.; Gheller, C.; Brüggen, M.; Brunetti, G.; Bonafede, A.; Ettori, S.; Stuardi, C.; Paoletti, D.; Finelli⋆, F.

doi:10.48550/arxiv.2111.09129

Cited by 4 publications

(4 citation statements)

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“…As ultra-high-energy nuclei are charged, their propagation is also affected by magnetic fields on galactic, intrahalo, intracluster and intergalactic scales, which could impact the interpretation of anisotropies detected on large-angular scales at E > 8 × 10 18 eV [213] and suggested on intermediate angular scales at E > 40 × 10 18 eV [214]. New insights on cosmic magnetism are expected from radio observations of clusters and filaments with SKA and LOFAR (see, e.g., the MAGCOW project [215]). Such observations could guide numerical simulations of large-scale structures and inform gamma-ray searches for IGMF signatures.…”

Section: Knowns Expectations and Hopes From Gamma-ray Cosmologymentioning

confidence: 99%

Gamma-ray Cosmology and Tests of Fundamental Physics

Biteau,

Meyer

2022

Preprint

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The propagation of gamma-rays over cosmological distances is the subject of extensive theoretical and observational research at GeV and TeV energies. The mean free path of gamma-rays in the cosmic web is limited above 100 GeV due to the production of electrons and positrons on the cosmic optical and infrared backgrounds. Electrons and positrons cool in the intergalactic medium while gyrating in its magnetic fields, which could cause either its global heating or the production of lowerenergy secondary gamma-rays. The energy distribution of gamma-rays surviving the cosmological journey carries observed absorption features that gauge the emissivity of baryonic matter over cosmic time, constrain the distance scale of ΛCDM cosmology, and limit the alterations of the interaction cross section. Competitive constraints are in particular placed on the cosmic star-formation history as well as on phenomena expected from quantum gravity and string theory, such as the coupling to hypothetical axion-like particles or the violation of Lorentz invariance. Recent theoretical and observational advances offer a glimpse of the multi-wavelength and multi-messenger path that the new generation of gamma-ray observatories is about to open.

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Section: Knowns Expectations and Hopes From Gamma-ray Cosmologymentioning

confidence: 99%

Gamma-ray Cosmology and Tests of Fundamental Physics

Biteau,

Meyer

2022

Preprint

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show abstract

“…As ultra-high-energy nuclei are charged, their propagation is also affected by magnetic fields on galactic, intrahalo, intracluster and intergalactic scales, which could impact the interpretation of anisotropies detected on large-angular scales at E > 8 × 10 18 eV [213], and suggested on intermediate angular scales at E > 40 × 10 18 eV [214]. New insights on cosmic magnetism are expected from radio observations of clusters and filaments with SKA and LOFAR (see, e.g., the MAGCOW project [215]). Such observations could guide numerical simulations of large-scale structures and inform gamma-ray searches for IGMF signatures.…”

Section: Knowns Expectations and Hopes From Gamma-ray Cosmologymentioning

confidence: 99%

Gamma-Ray Cosmology and Tests of Fundamental Physics

Biteau

Meyer

2022

Galaxies

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The propagation of gamma-rays over cosmological distances is the subject of extensive theoretical and observational research at GeV and TeV energies. The mean free path of gamma-rays in the cosmic web is limited above 100 GeV due to the production of electrons and positrons on the cosmic optical and infrared backgrounds. Electrons and positrons cool in the intergalactic medium while gyrating in its magnetic fields, which could cause either its global heating or the production of lower-energy secondary gamma-rays. The energy distribution of gamma-rays surviving the cosmological journey carries observed absorption features that gauge the emissivity of baryonic matter over cosmic time, constrain the distance scale of ΛCDM cosmology, and limit the alterations of the interaction cross section. Competitive constraints are, in particular, placed on the cosmic star-formation history as well as on phenomena expected from quantum gravity and string theory, such as the coupling to hypothetical axion-like particles or the violation of Lorentz invariance. Recent theoretical and observational advances offer a glimpse of the multi-wavelength and multi-messenger path that the new generation of gamma-ray observatories is about to open.

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“…This may finally resolve the origin of cosmic magnetism. Magnetic fields in filaments, which follow the filamentary structure and cannot be produced by astrophysical mechanisms [47], would be the smoking gun of PMFs.…”

Section: Introductionmentioning

confidence: 99%

LiteBIRD science goals and forecasts: primordial magnetic fields

Paoletti,

Rubino-Martin,

Shiraishi

et al. 2024

J. Cosmol. Astropart. Phys.

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We present detailed forecasts for the constraints on the characteristics of primordial magnetic fields (PMFs) generated prior to recombination that will be obtained with the LiteBIRD satellite. The constraints are driven by some of the main physical effects of PMFs on the CMB anisotropies: the gravitational effects of magnetically-induced perturbations; the effects on the thermal and ionization history of the Universe; the Faraday rotation imprint on the CMB polarization spectra; and the non-Gaussianities induced in polarization anisotropies. LiteBIRD represents a sensitive probe for PMFs. We explore different levels of complexity, for LiteBIRD data and PMF configurations, accounting for possible degeneracies with primordial gravitational waves from inflation. By exploiting all the physical effects, LiteBIRD will be able to improve the current limit on PMFs at intermediate and large scales coming from Planck. In particular, thanks to its accurate B-mode polarization measurement, LiteBIRD will improve the constraints on infrared configurations for the gravitational effect, giving B n B=-2.9 1 Mpc< 0.8 nG at 95% C.L., potentially opening the possibility to detect nanogauss fields with high significance. We also observe a significant improvement in the limits when marginalized over the spectral index, B n Bmarg 1 Mpc< 2.2 nG at 95 % C.L. From the thermal history effect, which relies mainly on E-mode polarization data, we obtain a significant improvement for all PMF configurations, with the marginalized case, √⟨B 2⟩marg<0.50 nG at 95 % C.L. Faraday rotation constraints will take advantage of the wide frequency coverage of LiteBIRD and the high sensitivity in B modes, improving the limits by orders of magnitude with respect to current results, B n B=-2.9 1 Mpc < 3.2 nG at 95 % C.L. Finally, non-Gaussianities of the B-mode polarization can probe PMFs at the level of 1 nG, again significantly improving the current bounds from Planck. Altogether our forecasts represent a broad collection of complementary probes based on widely tested methodologies, providing conservative limits on PMF characteristics that will be achieved with the LiteBIRD satellite.

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Magnetogenesis and the Cosmic Web: a joint challenge for radio observations and numerical simulations

Abstract: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Cited by 4 publications

References 123 publications

Gamma-ray Cosmology and Tests of Fundamental Physics

Gamma-ray Cosmology and Tests of Fundamental Physics

Gamma-Ray Cosmology and Tests of Fundamental Physics

LiteBIRD science goals and forecasts: primordial magnetic fields

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