Constraining Axion-Like Particles with HAWC Observations of TeV Blazars

Jacobsen, Sunniva; Linden, Tim; Freese, Katherine

doi:10.48550/arxiv.2203.04332

Cited by 5 publications

(11 citation statements)

References 99 publications

(122 reference statements)

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“…Besides those, our limits result to be competitive with, and even supersede, most of the current bounds from high-energy gamma-ray astrophysics. Even under the assumption of the MIN IE model, our limits are comparable with the ones from a combined analysis of a sample of TeV blazars detected by HAWC [96], and the ones from the spectral analysis of very-high-energy gamma rays from the blazar Mrk421 [99]. Both limits are affected by severe uncertainties in the blazar jet and intracluster magnetic field models.…”

Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

“…The hatched yellow region displays the limit in scenario (i) for the case of maximal IE (as in the left panel) whereas the yellow region illustrates the loss of sensitivity when instead scenario (ii), a constant magnetic field strength throughout the history of the universe, is assumed. For comparison, we show various constraints on ALPs derived from different observables relevant in the very-high-energy regime: HAWC TeV blazars[96], Fermi-LAT measurements of the spectra of NGC 1275[97], H.E.S.S. searches for irregularities in the spectra of PKS 2155-304[98], combined ARGO-YBJ and Fermi-LAT observations of Mrk 421[99] as well as the non-observation of gamma rays from SN1987A[100].…”

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confidence: 99%

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First constraints on axion-like particles from Galactic sub-PeV gamma rays

Eckner,

Calore

2022

Preprint

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Experimental refinements and technical innovations in the field of extensive air shower telescopes have enabled measurements of Galactic cosmic-ray interactions in the sub-PeV (100 TeV to 1 PeV) range, providing new avenues for the search for new physics and dark matter. For the first time, we exploit sub-PeV (10 TeV -1 PeV) observations of Galactic diffuse gamma rays by Tibet ASγ and HAWC to search for an axion-like-particle (ALP) induced gamma-ray signal directly linked to the origin of the IceCube extragalactic high-energy neutrino flux. Indeed, the production of high-energy neutrinos in extragalatic sources implies the concomitant production of gamma rays at comparable energies. Within the magnetic field of the neutrino emitting sources, gamma rays may efficiently convert into ALPs and escape their host galaxy unattenuated, propagate through intergalactic space, and reconvert into gamma rays in the magnetic field of the Milky Way. Such a scenario creates an all-sky diffuse high-energy gamma-ray signal in the sub-PeV range. Accounting for the guaranteed Galactic astrophysical gamma-ray contributions from cosmic-ray interactions with gas and radiation and from sub-threshold sources, we set competitive upper limits on the photon-ALP coupling constant gaγγ. We find gaγγ < 2.1 × 10 −11 GeV −1 for ALP masses ma ≤ 2 × 10 −7 eV at a 95% confidence level, progressively closing the mass gap towards ADMX limits.

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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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First constraints on axion-like particles from Galactic sub-PeV gamma rays

Eckner,

Calore

2022

Preprint

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“…They may arise whenever magnetic fields are close to the critical Schwinger magnetic field, |B| S = m 2 e /q e = 4.41 × 10 9 T [14]. In astrophysical searches for ALPs, there are cases of blazars and magnetars with magnetic fields of the order or higher than the critical Schwinger magnetic field [8,15,16]. In a recent work, it has been discovered that non-linearities can also arise at low magnetic fields in a QED level for the so-called Dirac materials.…”

Section: Introductionmentioning

confidence: 99%

The axion-photon mixing in non-linear electrodynamic scenarios

Paixão

Ospedal

Neves

et al. 2022

J. High Energ. Phys.

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In this contribution, we re-assess some aspects of axionic electrodynamics by coupling non-linear electromagnetic effects to axion physics. We present a number of motivations to justify the coupling of the axion to the photon in terms of a general non-linear extension of the electromagnetic sector. Our emphasis in the paper relies on the investigation of the constitutive permittivity and permeability tensors, for which the axion contributes by introducing dependence on the frequency and wave vector of the propagating radiation. Also, we point out how the axion mass and the axion-photon-photon coupling constant contribute to a dispersive behavior of the electromagnetic waves, in contrast to what happens in the case of non-linear extensions, when effective refractive indices appear which depend only on the direction of the propagation with respect to the external fields. The axion changes this picture by yielding refractive indices with dependence on the wavelength. We apply our results to the special case of the (non-birefringent) Born-Infeld Electrodynamics and we show that it becomes birefringent whenever the axion is coupled. The paper is supplemented by an appendix, where we follow our own path to approach the recent discussion on a controversy in the definition of the Poynting vector of axionic electrodynamics.

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“…VHE photon-ALP conversions would imprint peculiar modulations in astrophysical spectra from faraway sources, such as blazars, active galactic nuclei, pulsars and galaxy clusters, see, e.g., Refs. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] for an incomplete list of studies that pointed out intriguing hints and bounds on ALP parameter space (see also Ref. [38] for a recent review).…”

Section: Introductionmentioning

confidence: 99%

Constraining axion-like particles with the diffuse gamma-ray flux measured by the Large High Altitude Air Shower Observatory

Mastrototaro,

Carenza,

Chianese

et al. 2022

Preprint

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The detection of very high-energy neutrinos by IceCube experiment supports the existence of a comparable gamma-ray counterpart from the same cosmic accelerators. Under the likely assumption that the sources of these particles are of extragalactic origin, the emitted photon flux would be significantly absorbed during its propagation over cosmic distances. However, in the presence of photon mixing with ultra-light axion-like-particles (ALPs), this expectation would be strongly modified. Notably, photon-ALP conversions in the host galaxy would produce an ALP flux which propagates unimpeded in the extragalactic space. Then, the back-conversion of ALPs in the Galactic magnetic field leads to a diffuse high-energy photon flux. In this context, the recent detection of the diffuse high-energy photon flux by the Large High Altitude Air Shower Observatory (LHAASO) allows us to exclude at the 95% CL an ALP-photon coupling gaγ 3.9 − 7.8 × 10 −11 GeV −1 for ma 4×10 −7 eV, depending on the assumptions on the magnetic fields and on the original gammaray spectrum. This new bound is complementary with other ALP constraints from very-high-energy gamma-ray experiments and sensitivities of future experiments.

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Constraining Axion-Like Particles with HAWC Observations of TeV Blazars

Cited by 5 publications

References 99 publications

First constraints on axion-like particles from Galactic sub-PeV gamma rays

First constraints on axion-like particles from Galactic sub-PeV gamma rays

The axion-photon mixing in non-linear electrodynamic scenarios

Constraining axion-like particles with the diffuse gamma-ray flux measured by the Large High Altitude Air Shower Observatory

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