Impact of spin polarization on transport and thermodynamic coefficients
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911342022098944 |
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| author | Wei, De-Xian |
| author_facet | Wei, De-Xian |
| contents | This work investigates the influence of parton spin polarization on effective transport and thermodynamic coefficients in noncentral light- and heavy-ion collisions. To model this influence, I consider two sources of spin polarization: thermal vorticity, induced by angular momentum, and thermal shear, arising from local velocity gradients. Using a novel kinetic theory framework, one finds that transport and thermodynamic coefficients -- including the speed of sound squared $c_{s}^{2}$, specific shear viscosity $η/s$, specific bulk viscosity $ζ/s$, and mean free path $λ$ -- are substantially modified by spin polarization effects. Among the two sources, thermal vorticity-induced spin polarization dominates the modifications to these coefficients. Moreover, both $c_{s}^{2}$ and $ζ/s$ exhibit a nonmonotonic dependence on the collision energy, and the associated scaling behaviors potentially serve as indicators of the critical phenomena of quantum chromodynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_18038 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of spin polarization on transport and thermodynamic coefficients Wei, De-Xian Nuclear Theory This work investigates the influence of parton spin polarization on effective transport and thermodynamic coefficients in noncentral light- and heavy-ion collisions. To model this influence, I consider two sources of spin polarization: thermal vorticity, induced by angular momentum, and thermal shear, arising from local velocity gradients. Using a novel kinetic theory framework, one finds that transport and thermodynamic coefficients -- including the speed of sound squared $c_{s}^{2}$, specific shear viscosity $η/s$, specific bulk viscosity $ζ/s$, and mean free path $λ$ -- are substantially modified by spin polarization effects. Among the two sources, thermal vorticity-induced spin polarization dominates the modifications to these coefficients. Moreover, both $c_{s}^{2}$ and $ζ/s$ exhibit a nonmonotonic dependence on the collision energy, and the associated scaling behaviors potentially serve as indicators of the critical phenomena of quantum chromodynamics. |
| title | Impact of spin polarization on transport and thermodynamic coefficients |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2507.18038 |