Contribution of Kaon component in viscosity and conductivity of hadronic medium

TL;DR

This paper investigates how kaons influence the shear viscosity and electrical conductivity of hadronic matter, revealing that kaons significantly impact these transport properties near the quark-hadron transition.

Contribution

It introduces a detailed calculation of kaon contributions to transport coefficients using in-medium self-energy and correlation functions, highlighting their temperature dependence.

Findings

Kaons increase shear viscosity near transition temperature.

Kaons' contribution to electrical conductivity shows opposite trend to pions.

Thermal width of kaons affects transport coefficient calculations.

Abstract

The two-point correlation functions of kaonic viscous stress tensors and electro-magnetic currents have been calculated respectively to estimate the contributions of the strange sector in the shear viscosity and electrical conductivity of hadronic medium. In the one-loop correlators, kaon propagators contain a non-zero thermal width that leads to non-divergent values of transport coefficients. With the help of effective Lagrangian densities of strange hadrons, we have calculated in-medium self-energy of kaon for different possible mesonic loops, whose imaginary part provide the estimation of kaon thermal width. It is observed that near the quark-hadron transition temperature, the contribution of kaons to shear viscosity is larger and increases faster with temperature than pionic contribution. In case of electrical conductivity the trend due kaon component appears to be opposite in nature with respect to pion component.