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

Journal Article · 06 February 2018 · Physics Letters. B

DOI: https://doi.org/10.1016/j.physletb.2018.01.084 · OSTI ID:1437824

Maruyama, Tomoyuki  ^[1]; Balantekin, A. Baha ^[2]; Cheoun, Myung-Ki ^[3]; Kajino, Toshitaka ^[4]; Mathews, Grant J. ^[5]

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1. National Astronomical Observatory of Japan, Tokyo (Japan); Nihon Univ., Fujisawa (Japan)
2. National Astronomical Observatory of Japan, Tokyo (Japan); Univ. of Wisconsin, Madison, WI (United States)
3. National Astronomical Observatory of Japan, Tokyo (Japan); Soongsil Univ., Seoul (Korea, Republic of)
4. National Astronomical Observatory of Japan, Tokyo (Japan); Univ. of Tokyo (Japan); Beihang Univ., Beijing (China)
5. Univ. of Notre Dame, IN (United States); National Astronomical Observatory of Japan, Tokyo (Japan)

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.

• Research Organization: University of Notre Dame, IN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: FG02-95ER40934; FG02-95-ER40934
• OSTI ID: 1437824
• Alternate ID(s): OSTI ID: 1499274
• Journal Information: Physics Letters. B, Vol. 779, Issue C; ISSN 0370-2693
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English