The XIX International Conference on Topics in Astroparticle and Underground Physics (TAUP2025)

Searching for Axion-Like Particles with X-ray Observations of Alpha Centauri

25 Aug 2025, 14:20

20m

Conference Room F2-R2

Oral Dark Matter and Its Detection Dark Matter and Its Detection

Speaker

Yue-Lin Sming Tsai (PMO)

Description

In this talk, we explore the production of axion-like particles (ALPs) in stellar, focusing on their decay into X-rays. We searched for these particles in the Alpha Centauri binary system using Chandra and eROSITA, covering an energy range of 0.2 to 10 keV. While no decay signals were found, our results set the most stringent limits on ALP interactions to date. We significantly improve constraints on the ALP-photon coupling, especially in the 0.25 to 5 keV mass range, surpassing previous measurements by up to two orders of magnitude. These findings offer new insights into ALP physics and its implications for both astrophysics and particle physics.