Magnetic helicity evolution in a neutron star accounting for the Adler-Bell-Jackiw anomaly
| Autor: | Maxim Dvornikov, Victor B. Semikoz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
магнитогидродинамика
FOS: Physical sciences Accounting Magnetar 01 natural sciences магнитная спиральность High Energy Physics - Phenomenology (hep-ph) Magnetic helicity магнитные поля 0103 physical sciences 010306 general physics 010303 astronomy & astrophysics Spin-½ Physics High Energy Astrophysical Phenomena (astro-ph.HE) Finite volume method нейтронные звезды business.industry Astronomy and Astrophysics Magnetic field Neutron star High Energy Physics - Phenomenology Anomaly (physics) Magnetohydrodynamics business Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Journal of cosmology and astroparticle physics. 2018. № 8. P. 021 (1-16) |
| Popis: | We analyze the role of the surface terms in the conservation law for the sum of the magnetic helicity density and the chiral imbalance of the charged particle densities. These terms are neglected in the Anomalous MagnetoHydroDynamics (AMHD), where infinite volume is considered typically. We discuss a finite volume system, such as a magnetized neutron star (NS), and study the contribution of the surface terms to the evolution of the magnetic helicity. Accounting for the fast washing out of the chiral imbalance in a nascent NS, we demonstrate that the surface terms contribution can potentially lead to the reconnection of magnetic field lines and subsequent gamma or X-ray bursts observed from magnetars. We derive the additional surface terms originated by the mean spin flux through a volume boundary arising due to macroscopic spin effects in electron-positron plasma. Then, comparing this quantum surface term with the classical one known in standard MHD, we find that the new quantum contribution prevails over classical term for the rigid NS rotation only. 16 pages in pdflatex, 1 pdf figure, jcap latex style; paper was significantly revised, Sec. 3 was extended, some notations were improved; version published in JCAP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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