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Transport coefficients serve as important probes in characterizing the QCDmatter created in high-energy heavy-ion collisions. Thermal and electricalconductivities as transport coefficients have got special significance instudying the time evolution of the created matter. We have adopted color stringpercolation approach for the estimation of thermal conductivity ($\kappa$),electrical conductivity ($\sigma_{el}$) and their ratio, which is popularlyknown as Wiedemann-Franz law in condensed matter physics. The ratio$\kappa/\sigma_{el}T$, which is also known as Lorenz number ($\mathbb{L}$) isstudied as a function of temperature and is compared with various theoreticalcalculations. We observe that the thermal conductivity for hot QCD medium isalmost temperature independent in the present formalism and matches with theresults obtained in ideal equation of state (EOS) for quark-gluon plasma withfixed coupling constant ($\alpha_s$). The obtained Lorenz number is comparedwith the Stefan-Boltzmann limit for an ideal gas. We observe that a hot QCDmedium with color degrees of freedom behaves like a free electron gas.

Wiedemann-Franz Law For Hot QCD Matter in a Color String Percolation Scenario