gammaALPs: An open-source python package for computing photon-axion-like-particle oscillations in astrophysical environments

Abstract

Axions and axion-like particles (ALPs) are hypothetical particles that occur in extensions of the Standard Model and are candidates for cold dark matter. They could be detected through their oscillations into photons in the presence of external electromagnetic fields. gammaALPs is an open-source python framework that computes the oscillation probability between photons and axions/ALPs. In addition to solving the photon-ALP equations of motion, gammaALPs includes models for magnetic fields in different astrophysical environments such as jets of active galactic nuclei, intra-cluster and intergalactic media, and the Milky Way. Users are also able to easily incorporate their own custom magnetic-field models. We review the basic functionality and features of gammaALPs, which is heavily based on other open-source scientific packages such as numpy and scipy. Although focused on gamma-ray energies, gammaALPs can be easily extended to arbitrary photon energies.

Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021). The online documentation is available at https://gammaalps.readthedocs.io/

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• Constraints on Axion-like Particles from Observations of Mrk 421 using the $\mathrm{C}{\mathrm{L}}_{\mathrm{s}}$ Method
• Probing photon-ALP oscillations from the MAGIC observations of FSRQ QSO B1420+326
• GRB 221009A: Spectral signatures based on ALPs candidates
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• Physics Beyond the Standard Model with Future X-ray Observatories: Projected Constraints on Very-Light Axion-Like Particles with $Athena$ and $AXIS$
• Constraining axionlike particles with invisible neutrino decay using the IceCube observations of NGC 1068
• Propagation of very-high-energy $\gamma$-rays from distant blazars
• Constraints on Axion-like Particles from the gamma-ray observation of the Galactic Center
• Probing the Axion-Nucleon Coupling with Supergiant Stars
• Fresh look at the diffuse ALP background from supernovae
• Constraints on axion-like particles from ultra-high-energy observations of M87 with the HAWC observatory
• X-ray polarimetric features of Gamma-ray Bursts across varied redshifts and hints for Axion-Like-Particles
• Axion-like Particles and their Possible Impact on the Very High-Energy Spectrum of M87 Observed by LHAASO