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arXiv · 2610.30393

Thermomagnetic enhancement of conserved-charge correlations in a lattice-constrained PNJL model

Bruno S. Lopes·Arthur E. B. Pasqualotto·Jandir J. Buttenbender Filho·Dyana C. Duarte·Ricardo L. S. Farias
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Abstract

Conserved-charge correlations offer a promising probe of magnetic fields in strongly interacting matter. We investigate their magnetic response and the finite-density equation of state within a lattice-constrained three-flavor Polyakov--Nambu--Jona-Lasinio model. A thermomagnetic scalar coupling, inferred by Gaussian process regression from lattice QCD results for the average light-quark condensate, incorporates inverse magnetic catalysis into the effective interaction. Without fitting conserved-charge observables, the resulting framework substantially improves their magnetic-field dependence and crossover behavior compared with the fixed-coupling model. In particular, it captures the pronounced magnetic enhancement of the baryon--electric-charge correlation and related susceptibility ratios, supporting their use as QCD magnetometers. The comparison demonstrates that the medium dependence of the effective interaction is essential to describe this response within the model. We further calculate pressure Taylor coefficients through sixth order and reconstruct the pressure and baryon density at nonzero baryon chemical potential. Our results show that lattice information from a single chiral observable constrains a broad thermodynamic response, connecting inverse magnetic catalysis, conserved-charge correlations, and the equation of state in a common framework. This provides a lattice-constrained basis for investigating magnetic-field signatures and finite-density thermodynamics in QCD matter.

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Bruno S. Lopes, Arthur E. B. Pasqualotto, Jandir J. Buttenbender Filho, Dyana C. Duarte, Ricardo L. S. Farias. 2026-10-21. Thermomagnetic enhancement of conserved-charge correlations in a lattice-constrained PNJL model. https://arxiv.org/abs/2610.30393

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