Extragalactic photon-ALP conversion at CTA energies

Kartavtsev, A.; Raffelt, G.; Vogel, H.

doi:10.1088/1475-7516/2017/01/024

Title: Extragalactic photon-ALP conversion at CTA energies

Journal Article · Thu Jan 12 00:00:00 EST 2017 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2017/01/024· OSTI ID:1360940

Kartavtsev, A. ^[1]; Raffelt, G. ^[1]; Vogel, H. ^[2]

Max-Planck-Inst. fur Physik, Munich (Germany)
Max-Planck-Inst. fur Physik, Munich (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)

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_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_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_osc ~ l >> l_t). We also make analytical predictions for the transfer functions in the quasi-adiabatic regime (l_osc <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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; German Research Foundation (DFG); European Union (EU)

Grant/Contract Number:: AC02-76SF00515; EXC 153; H2020-MSCAITN- 2015/674896-ELUSIVES

OSTI ID:: 1360940

Report Number(s):: SLAC-PUB-16842

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 01; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Searching for the possible signal of the photon-axionlike particle oscillation in the combined GeV and TeV spectra of supernova remnants Xia, Zi-Qing; Liang, Yun-Feng; Feng, Lei Physical Review D, Vol. 100, Issue 12 https://doi.org/10.1103/physrevd.100.123004	journal	December 2019
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Enhancing the Spectral Hardening of Cosmic TeV Photons by Mixing with Axionlike Particles in the Magnetized Cosmic Web Montanino, Daniele; Vazza, Franco; Mirizzi, Alessandro Physical Review Letters, Vol. 119, Issue 10 https://doi.org/10.1103/physrevlett.119.101101	journal	September 2017
Physics potential of the International Axion Observatory (IAXO) Armengaud, E.; Attie, D.; Basso, S. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-02069	text	January 2019
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Physics potential of the International Axion Observatory (IAXO) Armengaud, E.; Attie, D.; Basso, S. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-02656	text	January 2019
Enhancing the Spectral Hardening of Cosmic TeV Photons by Mixing with Axionlike Particles in the Magnetized Cosmic Web Montanino, Daniele; Vazza, Franco; Mirizzi, Alessandro arXiv https://doi.org/10.48550/arxiv.1703.07314	text	January 2017
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