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

Authors :: Tomoyuki Maruyama
Grant J. Mathews
Myung-Ki Cheoun
A. Baha Balantekin
Toshitaka Kajino
Source :: Physics Letters B, Vol 779, Iss, Pp 160-165 (2018), Physics Letters B
Publication Year :: 2018
Publisher :: Elsevier BV, 2018.
Abstract: 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.<br />Comment: 14 pages, 3 figures

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