arXiv subjects

Arthur E. B. Pasqualotto

Publications and source records attributed to Arthur E. B. Pasqualotto.

4 recordsLinked to original sources

arXiv2026

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

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.

hep-ph↗

arXiv2026

Speed of sound peak in two-color dense QCD: confronting effective models with lattice data

Lattice simulations of two-color, two-flavor Quantum Chromodynamics (QCD) at finite quark chemical potential have revealed a distinctive peak structure in the sound velocity. Although chiral perturbation theory (ChPT) and the Nambu-Jona-Lasinio (NJL) model have been employed to explain this phenomenon, neither approach has fully captured the observed behavior. To address this discrepancy, we have extended the NJL framework by incorporating the Medium Separation Scheme (MSS). This approach isolates medium contributions from divergent integrals, allowing for a more accurate treatment of finite-density effects. Our results indicate a clear increase in the diquark gap ($Δ$) with increasing chemical potential, consistent with what is also seen in perturbative QCD predictions at high densities. {}Furthermore, the MSS-modified NJL model successfully reproduces the observed peak in the sound velocity.

hep-ph↗

arXiv2026

Violation of the Conformal Limit at Finite Density: Insights from Effective Models and Lattice QCD

In this work, we discuss recent results obtained with the application of the medium separation scheme (MSS) in different contexts where a clear violation of the conformal limit for the speed of sound at finite density has been observed in Quantum Chromodynamics (QCD). We analyze several scenarios, including QCD at finite isospin density, two-color QCD, and two-flavor color superconductivity. Whenever possible, we compare our findings with lattice QCD (LQCD) results, showing that the Nambu--Jona-Lasinio (NJL) model combined with the MSS provides a consistent description across different regimes of the QCD phase diagram. Our analysis highlights how effective models, when properly regularized, can capture essential nonperturbative features of dense QCD matter, offering complementary insights to lattice simulations.

hep-ph↗

arXiv2023

Causality violation and the speed of sound of hot and dense quark matter in the Nambu--Jona-Lasinio model

The Nambu--Jona-Lasinio model is widely used to study strong-interaction phenomena in vacuum and quark matter. Since the model is nonrenormalizable, one needs to work within a specific regularization scheme to obtain finite results. Here we show that a commonly used cutoff regularization scheme leads to unphysical results, such as superluminal speed of sound and wrong high-temperature behavior of the specific heat and other thermodynamical quantities. Such a troublesome feature of the cutoff regularization invalidates the model for temperature and baryon density values relevant to the phenomenology of heavy-ion collisions and compact stars. We show that the source of the problems stems from cutting off momentum modes in finite integrals depending on thermal distribution functions in the grand canonical potential. The problems go away when taking into account the full momentum range of those integrals. Explicit examples are worked out in the SU(2)-flavor version of the model.

hep-ph↗