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2014

Magnetars and the Chiral Plasma Instabilities

Ohnishi, Akira, Yamamoto, Naoki

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We propose a possible new mechanism for a strong and stable magnetic field of compact stars due to an instability in the presence of a chirality imbalance of electrons---the chiral plasma instability.

A large chirality imbalance of electrons inevitably occurs associated with the parity-violating weak process during core collapse of supernovae.
We estimate the maximal magnetic field due to this instability to be of order 10^{18} G at the core.
This mechanism naturally generates a large magnetic helicity from the chiral asymmetry, which ensures the stability of the large magnetic field.

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We do not consider the chiral asymmetry of electrons generated in the direct and modified Urca processes after the birth of a neutron star, as it is much smaller than that produced at the stage of core collapse; for the possible astrophysical consequences of the chiral asymmetry at later stages, see Ref. [ 20 ]

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Y. Akamatsu, A. Rothkopf, and N. Yamamoto, work in progress

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