In-medium effect on the thermodynamics and transport coefficients in van der Waals hadron resonance gas

Abstract

An extension of the van der Waals hadron resonance gas (VDWHRG) model which includes in-medium thermal modification of hadron masses, the TVDWHRG model, is considered in this paper. Based on the 2+1 flavor Polyakov Linear Sigma Model(PLSM) and the scaling mass rule for hadrons we obtain the temperature behavior of all hadron masses for different fixed baryon chemical potentials ${\mu }_B$. We calculate various thermodynamic observables at ${\mu }_B=0$ GeV in TVDWHRG model. An improved agreement with the lattice data by TVDWHRG model in the crossover region ($T\sim 0.16-0.19$ GeV) is observed as compared to those by VDWHRG and Ideal HRG (IHRG) models. We further discuss the effects of in-medium modification of hadron masses and VDW interactions on the transport coefficients such as shear viscosity ($\eta$), scaled thermal ($\lambda /T^2$) and electrical (${\sigma }_{el}/T$ conductivities in IHRG model at different ${\mu }_B$, by utilizing quasi-particle kinetic theory with relaxation time approximation.

arXiv comment17 pages, 13 figures

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