Axion production from Landau quantization in the strong magnetic field of magnetars

作者：Maruyama, Tomoyuki^*; Balantekin, A. Baha; Cheoun, Myung-Ki; Kajino, Toshitaka; Mathews, Grant J.

来源：Physics Letters B, 2018, 779: 160-165.

DOI：10.1016/j.physletb.2018.01.084

• Axion production
• Strong magnetic field
• Quantum approach
• Landau level

We utilize an exact quantum calculation to explore axion emission from electrons and protons in the presence of the strong magnetic field of magnetars. The axion is emitted via transitions between the Landau levels generated by the strong magnetic field. The luminosity of axions emitted by protons is shown to be much larger than that of electrons and becomes stronger with increasing matter density. Cooling by axion emission is shown to be much larger than neutrino cooling by the Urca processes. Consequently, axion emission in the crust may significantly contribute to the cooling of magnetars. In the high-density core, however, it may cause heating of the magnetar. C) 2018 The Authors. Published by Elsevier B.V.

• 出版日期2018-4-10
• 单位中国科学院国家天文台; 北京航空航天大学