Updated bounds on axion-like particles from X-ray observations

Schallmoser, Simon; Krippendorf, Sven; Chadha-Day, Francesca und Weller, Jochen (2022): Updated bounds on axion-like particles from X-ray observations. In: Monthly Notices of the Royal Astronomical Society, Bd. 514, Nr. 1: S. 329-341

Abstract

In this work, we revisit five different point sources within or behind galaxy clusters to constrain the coupling constant between axion-like particles (ALPs) and photons. We use three distinct machine learning (ML) techniques and compare our results with a standard chi(2) analysis. For the first time, we apply approximate Bayesian computation to search for ALPs and find consistently good performance across ML classifiers. Further, we apply more realistic 3D magnetic field simulations of galaxy clusters and compare our results with previously used 1D simulations. We find constraints on the ALP-photon coupling at the level of state-of-the-art bounds with g(a gamma gamma) less than or similar to 0.6 x 10(-12) GeV-1, hence improving on previous constraints obtained from the same observations.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 390783311