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Title: Extragalactic photon-ALP conversion at CTA energies

Abstract

Magnetic fields in extragalactic space between galaxy clusters may induce conversions between photons and axion-like particles (ALPs), thereby shielding the photons from absorption on the extragalactic background light. For TeV gamma rays, the oscillation length ( l {sub osc}) of the photon-ALP system becomes inevitably of the same order as the coherence length of the magnetic field l and the length over which the field changes significantly (transition length l {sub t}) due to refraction on background photons. We derive exact statistical evolution equations for the mean and variance of the photon and ALP transfer functions in the non-adiabatic regime ( l {sub osc} ∼ l >> l {sub t}). We also make analytical predictions for the transfer functions in the quasi-adiabatic regime ( l {sub osc} || l , l {sub t}). Our results are important in light of the upcoming Cherenkov Telescope Array (CTA), and may also be applied to models with non-zero ALP masses.

Authors:
;
Publication Date:
OSTI Identifier:
22680092
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; AXIONS; COHERENCE LENGTH; CONVERSION; EVOLUTION EQUATIONS; FORECASTING; GALAXIES; GALAXY CLUSTERS; GAMMA RADIATION; MAGNETIC FIELDS; MASS; OSCILLATIONS; PHOTONS; SPACE; TELESCOPES; TEV RANGE; TRANSFER FUNCTIONS; VISIBLE RADIATION

Citation Formats

Kartavtsev, A., Raffelt, G., and Vogel, H., E-mail: alexander.kartavtsev@mpp.mpg.de, E-mail: raffelt@mpp.mpg.de, E-mail: hvogel@slac.stanford.edu. Extragalactic photon-ALP conversion at CTA energies. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/01/024.
Kartavtsev, A., Raffelt, G., & Vogel, H., E-mail: alexander.kartavtsev@mpp.mpg.de, E-mail: raffelt@mpp.mpg.de, E-mail: hvogel@slac.stanford.edu. Extragalactic photon-ALP conversion at CTA energies. United States. doi:10.1088/1475-7516/2017/01/024.
Kartavtsev, A., Raffelt, G., and Vogel, H., E-mail: alexander.kartavtsev@mpp.mpg.de, E-mail: raffelt@mpp.mpg.de, E-mail: hvogel@slac.stanford.edu. Sun . "Extragalactic photon-ALP conversion at CTA energies". United States. doi:10.1088/1475-7516/2017/01/024.
@article{osti_22680092,
title = {Extragalactic photon-ALP conversion at CTA energies},
author = {Kartavtsev, A. and Raffelt, G. and Vogel, H., E-mail: alexander.kartavtsev@mpp.mpg.de, E-mail: raffelt@mpp.mpg.de, E-mail: hvogel@slac.stanford.edu},
abstractNote = {Magnetic fields in extragalactic space between galaxy clusters may induce conversions between photons and axion-like particles (ALPs), thereby shielding the photons from absorption on the extragalactic background light. For TeV gamma rays, the oscillation length ( l {sub osc}) of the photon-ALP system becomes inevitably of the same order as the coherence length of the magnetic field l and the length over which the field changes significantly (transition length l {sub t}) due to refraction on background photons. We derive exact statistical evolution equations for the mean and variance of the photon and ALP transfer functions in the non-adiabatic regime ( l {sub osc} ∼ l >> l {sub t}). We also make analytical predictions for the transfer functions in the quasi-adiabatic regime ( l {sub osc} || l , l {sub t}). Our results are important in light of the upcoming Cherenkov Telescope Array (CTA), and may also be applied to models with non-zero ALP masses.},
doi = {10.1088/1475-7516/2017/01/024},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 01,
volume = 2017,
place = {United States},
year = {2017},
month = {1}
}

Works referencing / citing this record:

Physics potential of the International Axion Observatory (IAXO)
journal, June 2019