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Review

Gamma-Ray Cosmology and Tests of Fundamental Physics

by 1,* and 2,*
1
Laboratoire de Physique des deux Infinis Irene Joliot-Curie—IJCLab, Université Paris-Saclay, CNRS/IN2P3, 91405 Orsay, France
2
Institute for Experimental Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
*
Authors to whom correspondence should be addressed.
Academic Editors: John Quinn, Deirdre Horan and Elisa Pueschel
Galaxies 2022, 10(2), 39; https://doi.org/10.3390/galaxies10020039
Received: 7 January 2022 / Revised: 1 February 2022 / Accepted: 5 February 2022 / Published: 22 February 2022
(This article belongs to the Special Issue Extragalactic TeV Astronomy)
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. View Full-Text
Keywords: gamma-ray astronomy; blazars; gamma-ray bursts; cosmic background radiation; extragalactic magnetic fields; axion-like particles; Lorentz invariance gamma-ray astronomy; blazars; gamma-ray bursts; cosmic background radiation; extragalactic magnetic fields; axion-like particles; Lorentz invariance
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MDPI and ACS Style

Biteau, J.; Meyer, M. Gamma-Ray Cosmology and Tests of Fundamental Physics. Galaxies 2022, 10, 39. https://doi.org/10.3390/galaxies10020039

AMA Style

Biteau J, Meyer M. Gamma-Ray Cosmology and Tests of Fundamental Physics. Galaxies. 2022; 10(2):39. https://doi.org/10.3390/galaxies10020039

Chicago/Turabian Style

Biteau, Jonathan, and Manuel Meyer. 2022. "Gamma-Ray Cosmology and Tests of Fundamental Physics" Galaxies 10, no. 2: 39. https://doi.org/10.3390/galaxies10020039

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