Bhadury, SamapanSamapanBhaduryDas, ArpanArpanDasFlorkowski, WojciechWojciechFlorkowskiGowthama, K. K.K. K.GowthamaRyblewski, RadoslawRadoslawRyblewski2025-08-312025-08-312024-02-0110.1016/j.physletb.2024.1384642-s2.0-85183103210http://repository.iitgn.ac.in/handle/IITG2025/29050Semiclassical expansion of the Wigner function for spin-12 fermions having an effective spacetime-dependent mass is used to analyze spin-polarization effects. The existing framework is reformulated to obtain a differential equation directly connecting the particle spin tensor with the effective mass. It reflects the conservation of the total angular momentum in a system. In general, we find that the gradients of mass act as a source of the spin polarization. Although this effect is absent for simple boost-invariant dynamics, an extension to non-boost-invariant systems displays a non-trivial dependence of the spin density on the mass indicating that the spin polarization effects may be intertwined with the phenomenon of chiral restoration.trueArticlehttps://doi.org/10.1016/j.physletb.2024.138464February 20243138464arJournal2