Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Generation of the magnetic helicity in a neutron star driven by the electroweak electron-nucleon interaction

Full text
Dvornikov, Maxim [1, 2, 3] ; Semikoz, Victor B. [2]
Total Authors: 2
[1] Univ Sao Paulo, Inst Phys, BR-05314970 Sao Paulo, SP - Brazil
[2] Pushkov Inst Terr Magnetism Ionosphere & Radiowav, Troitsk 142190, Moscow - Russia
[3] Natl Res Tomsk State Univ, Fac Phys, Tomsk 634050 - Russia
Total Affiliations: 3
Document type: Journal article
Source: Journal of Cosmology and Astroparticle Physics; n. 5 MAY 2015.
Web of Science Citations: 12

We study the instability of magnetic fields in a neutron star core driven by the parity violating part of the electron-nucleon interaction in the Standard Model. Assuming a seed field of the order 10(12) G, that is a common value for pulsars, one obtains its amplification due to such a novel mechanism by about five orders of magnitude, up to 10(17) G, at time scales similar to (10(3)-10(5)) yr. This effect is suggested to be a possible explanation of the origin of the strongest magnetic fields observed in magnetars. The growth of a seed magnetic field energy density is stipulated by the corresponding growth of the magnetic helicity density due to the presence of the anomalous electric current in the Maxwell equation. Such an anomaly is the sum of the two competitive effects: (i) the chiral magnetic effect driven by the difference of chemical potentials for the right and left handed massless electrons and (ii) constant chiral electroweak electron-nucleon interaction term, which has the polarization origin and depends on the constant neutron density in a neutron star core. The remarkable issue for the decisive role of the magnetic helicity evolution in the suggested mechanism is the arbitrariness of an initial magnetic helicity including the case of non-helical fields from the beginning. The tendency of the magnetic helicity density to the maximal helicity case at large evolution times provides the growth of a seed magnetic field to the strongest magnetic fields in astrophysics. (AU)

FAPESP's process: 11/50309-2 - Collective neutrino oscillationsin various external fields.
Grantee:Maxim Dvornikov
Support Opportunities: Scholarships in Brazil - Post-Doctoral