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  • Open Access

Spin polarized quasiparticle in an off-equilibrium medium

Shu Lin1,* and Jiayuan Tian1,2,†

  • *Contact author: linshu8@mail.sysu.edu.cn
  • †Contact author: tian12@iu.edu
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Phys. Rev. D 112, 034005 – Published 5 August, 2025

DOI: https://doi.org/10.1103/f92k-667g

Abstract

We classify radiative corrections to spin polarization into three types: (i) spectral function, (ii) modified distribution function, and (iii) modified Kubo-Martin-Schwinger relation. The last two contributions modify the well-known free theory results. The first contribution is present with radiative correction only. We perform a detailed analysis on the first type for an energetic quark in a medium with hydrodynamic gradients, finding the radiative correction to spectral function leads to a polarized quasiparticle. The degeneracy of spin polarization induced by different hydrodynamic sources in free theory is lifted by radiative correction. We argue that the corrections of the last two types are parametrically suppressed with respect to the first type for the energetic quark we consider.

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Phys. Rev. D 112, 034005– Published 5 August, 2025
  • Received 8 April 2025
  • Accepted 16 July 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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