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  • Open Access

Pulsar kick by the chiral anisotropy conversion

Kenji Fukushima*

Chengpeng Yu†

  • *Contact author: fuku@nt.phys.s.u-tokyo.ac.jp
  • †Contact author: yu.chengpeng@nucl.ph.tsukuba.ac.jp
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Phys. Rev. D 112, 023037 – Published 24 July, 2025

DOI: https://doi.org/10.1103/q78h-r8xt

Abstract

We discuss a novel mechanism for the proto-neutron star acceleration assisted by the chiral separation effect, which induces an axial vector current in a dense medium. We consider the process of neutrinos scattering off the background axial vector current of electrons. We show that anisotropy of either magnetic field or density in momentum space is essential for nonzero recoil, and we call this mechanism the chiral anisotropy conversion. Assuming a strong magnetic field B≃1012  T and anisotropy by ∼10%, we find that the chiral anisotropy conversion can yield the velocity of order of typical pulsar kicks, i.e., vkick≳1000  km/s.

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Phys. Rev. D 112, 023037– Published 24 July, 2025
  • Received 8 February 2024
  • Revised 10 June 2025
  • Accepted 2 July 2025
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