Towards discrimination between galactic and intergalactic axion-photon mixing

Troitsky, S.

doi:10.1103/physrevd.93.045014

Cited by 21 publications

(25 citation statements)

References 87 publications

(195 reference statements)

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“…Broadly speaking, two complementary ALP/photon conversion scenarios for enhancing transparency of the VHE universe have been proposed [20,49,52]: (a) photons convert to ALPs in the gamma-ray sources and then back-conversion happens in GMF, e.g. Ref.…”

Section: B Conversion Scenariosmentioning

confidence: 99%

Testing the CIBER cosmic infrared background measurements and axionlike particles with observations of TeV blazars

et al. 2020

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The first measurements from the CIBER experiment of extragalactic background light (EBL) in near-infrared (NIR) band exhibit a higher intensity than those inferred through γ-ray observations. Recent theoretical-EBL intensities are typically consistent with the very high energy (VHE) γ-ray observations. Yet, it is possible that the excess NIR radiation is a new component of EBL and not in tension with the TeV spectra of distant blazars, since the hypothetical axion-like particle (ALP) may lead to a reduced opacity of the Universe for VHE γ-rays. In order to probe whether the excess component arises mainly from EBL, thirteen observed spectra in high energy and VHE ranges from ten distant TeV BL Lac objects are fitted by four theoretical spectra which involve theoretical EBL (Gilmore ), Gilmore's EBL model including photon/ALP coupling, Gilmore's EBL with CIBER excess and the latter including photon/ALP coupling respectively. We find the goodness of fit for the model with CIBER excess can be improved with a significance of 7.6 σ after including the photon/ALP coupling; Thus, the ALP/photon mixing mechanism can effectively alleviate the tension; However, the Gilmore EBL model, on the whole, is more compatible with the observed spectra compared to those with ALP, although individual blazars such as PKS 1424+240 and 1ES 1101-232 prefer the ALP-model. Our results suggest that the recent EBL models can solely explain the VHE γ-ray observations, and assuming the existence of the ALP to alleviate the tension is not required in a statistical sense, thus the excess over the EBL models is less likely to be a new EBL component. * EBL intensities (for reviews see e.g. Refs. [1,16,17]) and test the empirical EBL models, e.g. Refs. [8][9][10][11][12][13], by comparing the difference between the assumed-intrinsic spectra and the observed one. Thanks to the discovery of more and more distant Tev blazars, several groups have detected this imprint, e.g. Refs. [15,18,19], and found the intensities were near the galaxy-count lower limits.The spectra of a few individual blazars such as PKS1424+240 appear to be unexpectedly hard [34]. Furthermore, hints for a reduced gamma-ray opacity in the form of a pair-production anomaly [20] (i.e., VHE γ-ray observations require an EBL level below the lower limits from galaxy counts), or unusual redshift-dependent intrinsic (after correction for EBL absorption) spectral hardening found in large samples, have been claimed by several authors [21][22][23][24]. However, no significant and systematic anomalies on the entire sample were revealed by recent systematic studies of spectra fitted with recent theoretical EBL absorption on large samples of VHE blazars, see e.g., 33,34]. The intensities of these recent EBL models (e.g. Franceschini 2008 [8], Dominguez 2011 [9], Kneiske 2010 [10], Finke 2010 [11], Gilmore 2012 [12], Stecker 2016 [13]) are close to that from the galaxy counts. At present, many EBL measurements inferred by γ-ray observations reveal that its intensities are generally consistent with ...

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Section: B Conversion Scenariosmentioning

confidence: 99%

Testing the CIBER cosmic infrared background measurements and axionlike particles with observations of TeV blazars

et al. 2020

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“…Refs. [7][8][9][10][11][12][13][14][15][16][17][18][19]. We begin by reviewing the discussion of the pion form factor in the Bethe-Salpeter (BS) formalism.…”

Section: Pion Form Factor In the Bethe-salpeter Theorymentioning

confidence: 99%

Pion electromagnetic form factor in the covariant spectator theory

et al. 2014

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The pion electromagnetic form factor at spacelike momentum transfer is calculated in relativistic impulse approximation using the Covariant Spectator Theory. The same dressed quark mass function and the equation for the pion bound-state vertex function as discussed in the companion paper are used for the calculation, together with a dressed quark current that satisfies the Ward-Takahashi identity. The results obtained for the pion form factor are in agreement with experimental data, they exhibit the typical monopole behavior at high-momentum transfer, and they satisfy some remarkable scaling relations.

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“…Present upper limits on extragalactic magnetic fields together with constraints on ALP parameters from non-observation of gamma radiation from supernova SN1987A, persistence of the gamma-ray propagation anomaly up to high redshifts and some hints on the Galactic anisotropy in the anomaly manifestation make the second scenario more favourable [38], though the first one is not yet excluded. The second,…”

Section: Astrophysical Constraints and Indicationsmentioning

confidence: 94%

Towards a medium-scale axion helioscope and haloscope

et al. 2017

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We discuss the physics case for and the concept of a medium-scale axion helioscope with sensitivities in the axion-photon coupling a few times better than CERN Axion Solar Telescope (CAST). Search for an axion-like particle with these couplings is motivated by several persistent astrophysical anomalies. We present early conceptual design, existing infrastructure, projected sensitivity and timeline of such a helioscope (Troitsk Axion Solar Telescope Experiment, TASTE) to be constructed in the Institute for Nuclear Research, Troitsk, Russia. The proposed instrument may be also used for the search of dark-matter halo axions.Keywords: Large detector systems for particle and astroparticle physics; Dark Matter detectors (WIMPs, axions, etc.); X-ray detectorsRecently ADMX-HF [46] has put strong limits g aγγ < 2 × 10 −14 GeV −1 over the mass

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Towards discrimination between galactic and intergalactic axion-photon mixing

Cited by 21 publications

References 87 publications

Testing the CIBER cosmic infrared background measurements and axionlike particles with observations of TeV blazars

Testing the CIBER cosmic infrared background measurements and axionlike particles with observations of TeV blazars

Pion electromagnetic form factor in the covariant spectator theory

Towards a medium-scale axion helioscope and haloscope

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