Chiral restoration temperature at finite spin density in QCD
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911127151050752 |
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| author | Singha, Pracheta Ambrus, Victor E. Busuioc, Sergiu Bandyopadhyay, Aritra Chernodub, Maxim N. |
| author_facet | Singha, Pracheta Ambrus, Victor E. Busuioc, Sergiu Bandyopadhyay, Aritra Chernodub, Maxim N. |
| contents | We investigate the impact of a uniform spin density on the critical temperature of the chiral phase transition in finite-temperature QCD in the scope of the linear sigma model. We demonstrate that at a finite spin potential $μ_Σ$, corresponding to a finite spin density, the predictive power of the model is challenged by an ambiguity associated with a contribution of the vacuum renormalization term to the free energy. Eliminating the regularization freedom through comparison with recent low-$μ_Σ$ lattice data, we extend the phase diagram of QCD at finite spin density to regions inaccessible to lattice simulations. We show that, as the spin potential increases, the temperature of the chiral crossover transition diminishes and the chiral crossover turns into a first-order transition at a second-order critical end-point $(T,μ_Σ)_\mathrm{CEP}\simeq (0.142,0.098)$ GeV. With increasing spin potential, the critical temperature touches the zero-temperature axis at $μ_Σ = 0.310$ GeV, implying that the chiral symmetry is restored at higher potentials at any temperature. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_20237 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chiral restoration temperature at finite spin density in QCD Singha, Pracheta Ambrus, Victor E. Busuioc, Sergiu Bandyopadhyay, Aritra Chernodub, Maxim N. Nuclear Theory High Energy Physics - Theory We investigate the impact of a uniform spin density on the critical temperature of the chiral phase transition in finite-temperature QCD in the scope of the linear sigma model. We demonstrate that at a finite spin potential $μ_Σ$, corresponding to a finite spin density, the predictive power of the model is challenged by an ambiguity associated with a contribution of the vacuum renormalization term to the free energy. Eliminating the regularization freedom through comparison with recent low-$μ_Σ$ lattice data, we extend the phase diagram of QCD at finite spin density to regions inaccessible to lattice simulations. We show that, as the spin potential increases, the temperature of the chiral crossover transition diminishes and the chiral crossover turns into a first-order transition at a second-order critical end-point $(T,μ_Σ)_\mathrm{CEP}\simeq (0.142,0.098)$ GeV. With increasing spin potential, the critical temperature touches the zero-temperature axis at $μ_Σ = 0.310$ GeV, implying that the chiral symmetry is restored at higher potentials at any temperature. |
| title | Chiral restoration temperature at finite spin density in QCD |
| topic | Nuclear Theory High Energy Physics - Theory |
| url | https://arxiv.org/abs/2508.20237 |