The axion signature of strange quark star in SGR 0501+4516

Abstract

We study the axion effects on quark matter and quark-matter cores in strange quark magnetars using a three-flavor Nambu-Jona-Lasinio model to represent the charge-parity violating effects through the axion field. Here, axions decay to gamma rays in a very strong magnetic field, which the Fermi Large Area Telescope (Fermi-LAT), Imaging X-ray Polarimetry Explorer (IXPE), and XMM-Newton will be able to detect.

Comments: 14 pages, 2 figures. This work was presented at the International Workshop "Infinite and Finite Nuclear Matter'' (INFINUM-2025), 12-16 May 2025, BLTP, JINR, Dubna, Russian Federation