\begin{document}$ T/T_\chi-\mu_I/m_\pi $\end{document}) plane, indicating a decrease in the pseudo-critical temperature as the isospin chemical potential increases, and explore thermodynamic quantities related to the QCD equation of state at very high temperatures. Fluctuations of quark flavors, conserved charges, and baryon-charm correlations are studied across a wide temperature range. The SU(4) PQM model exhibits good qualitative agreement with lattice QCD calculations. Additionally, we calculate the meson mass spectrum at zero and finite temperature, showing that the charm sector remains thermally stable over a wide temperature range. Overall, this study highlights the capability of the SU(4) PQM model to describe key features of the QCD matter at high temperatures and its relevance to heavy-ion collisions and astrophysical studies."> Charmed meson structure across crossover from <i>SU</i>(4) Polyakov quark meson model with isospin asymmetry -
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