Séminaire de Physique Théorique
Chiral phase transition properties at finite spin densityPracheta Singha (Université de l'Ouest de Timișoara, Roumanie)
Thursday 11 September 2025 14:00 - Salle des séminaires - Salle 1180, bâtiment E2
Résumé :
The interaction properties of the quark-gluon plasma (QGP), produced in relativistic heavy-ion collisions, are governed by Quantum Chromodynamics (QCD). Low-energy effective models that reproduce the global symmetry properties of QCD are particularly useful for exploring this strongly interacting matter in regions of phase space still inaccessible to first-principle lattice simulations. In this talk, we focus on the QCD phase structure at finite spin density using the linear sigma model coupled to quarks via a quark spin potential, µΣ [1]. Spin polarization effects in the QGP have been experimentally observed in non-central heavy-ion collisions and are expected to influence the phase structure of the medium. However, lattice QCD simulations at finite µΣ remain significantly limited [2]. We will present the chiral phase diagram and thermodynamic properties of the medium at arbitrary temperature and spin density, ensuring consistency with lattice results through a proper vacuum renormalization procedure.
References :
1. P. Singha et al., “Chiral restoration temperature at finite spin density in QCD,” arXiv:2508.20237 [nucl-th].
2. V. V. Braguta et al., “Chiral and deconfinement thermal transitions at finite quark spin polarization in lattice QCD simulations,” Phys. Rev. D 111, 114508 (2025), arXiv:2503.18636 [hep-lat]
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