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| Main Author: | |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.16587 |
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| _version_ | 1866917265228693504 |
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| author | Wei, De-Xian |
| author_facet | Wei, De-Xian |
| contents | Spin polarization provides a novel probe of the rotational properties of the quark-gluon plasma formed in relativistic heavy-ion collisions. This work investigates the equation of state, particularly its transport and thermodynamic coefficients in noncentral O+O collisions, employing a parton distribution function that incorporates spin polarization induced by thermal vorticity. Within a kinetic theory framework, one finds that the magnitude of the squared speed of sound ($c_s^2$) is only weakly modified by spin polarization, whereas the specific shear viscosity ($η/s$), specific bulk viscosity ($ζ/s$), and mean free path ($λ$) show substantial changes. When spin polarization is included, both $c_s^2$ and $ζ/s$ develop a nonmonotonic dependence on the collision energy, with an inflection point near $\sqrt{s_{NN}}=27$ GeV, corresponding to an average parton chemical potential of $\langleμ_p\rangle=0.021$ GeV. These results suggest that spin polarization may serve as a useful probe for constraining the effective equation of state of QCD matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_16587 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of spin polarization on the QCD equation of state Wei, De-Xian Nuclear Theory Spin polarization provides a novel probe of the rotational properties of the quark-gluon plasma formed in relativistic heavy-ion collisions. This work investigates the equation of state, particularly its transport and thermodynamic coefficients in noncentral O+O collisions, employing a parton distribution function that incorporates spin polarization induced by thermal vorticity. Within a kinetic theory framework, one finds that the magnitude of the squared speed of sound ($c_s^2$) is only weakly modified by spin polarization, whereas the specific shear viscosity ($η/s$), specific bulk viscosity ($ζ/s$), and mean free path ($λ$) show substantial changes. When spin polarization is included, both $c_s^2$ and $ζ/s$ develop a nonmonotonic dependence on the collision energy, with an inflection point near $\sqrt{s_{NN}}=27$ GeV, corresponding to an average parton chemical potential of $\langleμ_p\rangle=0.021$ GeV. These results suggest that spin polarization may serve as a useful probe for constraining the effective equation of state of QCD matter. |
| title | Impact of spin polarization on the QCD equation of state |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2504.16587 |