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In this work, we have extracted the initial tempearture from the transversemomentum spectra of charged particles in $Au+Au$ collisions using STAR data atRHIC energies from $\sqrt{s_{NN}}$ = 7.7 to 200 GeV. The initial energy density($\varepsilon$), shear viscosity to entropy density ratio ($\eta/s$), traceanomaly ($\Delta$), the squared speed of sound ($C_s^2$), entropy density, andbulk viscosity to entropy density ratio ($\zeta/s$) are obtained and comparedwith the lattice QCD calculations for (2+1) flavor. The initial temperaturesobtained are compared with various hadronization and chemical freeze-outtemperatures. The analysis of the data shows that the deconfinement toconfinement transition possibly takes place between $\sqrt{s_{NN}}$ = 11.5 and19.6 GeV.

Thermodynamic and transport properties in Au + Au collisions at RHIC energies from the clustering of color strings