Reconciling hints on axion-like-particles from high-energy gamma rays with stellar bounds

Gautham, Ashok; Calore, Francesca; Giannotti, Maurizio; Horns, D.; Kuhlmann, Julian; Majumdar, Jhilik; Mirizzi, Alessandro; Ringwald, Andreas; Sokolov, Anton V.; Stief, Franziska; Yu, Qi-Xin

doi:10.1088/1475-7516/2021/11/036

Cited by 14 publications

(4 citation statements)

References 71 publications

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“…a cell-like model has the peculiarity that P aγ can be zero in the strong mixing regime for a certain alignment of the magnetic field 8. The CAST bound could be avoided in scenarios discussed in Ref [154]…”

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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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mentioning

confidence: 99%

Gamma-ray Cosmology and Tests of Fundamental Physics

Biteau,

Meyer

2022

Preprint

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“…Cl. ", for Galaxy Clusters, in Figure 4 [150][151][152][153][154][155]). One of the most studied sources in this regard is NGC 1275 at the center of the Perseus cluster.…”

Section: Deviations From the Standard Model At Ultra-high And Ultra-l...mentioning

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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“…Additional motivation to search for axions and axion-like particles (ALPs, which are not related to the CP conservation in QCD) comes from astrophysical riddles related to the evolution of stars and the propagation of high energy photons in the universe. They have been interpreted in various ways, however, a global analysis of all the data indicates a preference for axions and ALPs [233,144]. Interestingly, just one axion with a mass m a ≈ 10 −7 eV and g aγ ≈ 10 −11 GeV −1 , as predicted by [227], could very well explain the above mentioned riddles, constitute the dark matter and explain the CP conservation in QCD.…”

Section: Introductionmentioning

confidence: 99%

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop “Physics Beyond Colliders meets theory”, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.

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Reconciling hints on axion-like-particles from high-energy gamma rays with stellar bounds

Cited by 14 publications

References 71 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

Feebly-interacting particles: FIPs 2020 workshop report

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