Speaker
Dr
Anton Wiranata
(CCNU)
Description
The ratio $\eta/s$ of the shear viscosity, $\eta$, and the entropy density, s, of hot interacting hadrons is calculated using the Chapman-Enskog and virial expansion methods. Interactions are parametrized using the K-matrix which preserves the unitarity of the S-matrix. In the four component mixture $\pi-K-\eta-N$, 57 resonances up to 2 GeV are included. Increasing number of resonances is shown to reduce $\eta$ and increase s resulting in a progressive decrease of $\eta/s$ for temperatures close to the QCD
phase transition temperature. The addition of finite chemical potential reduce the value of $\eta/s$ even more in the comparison with zero chemical potential.
Prospects of hot hadrons becoming a “perfect” fluid are discussed.
Author
Dr
Anton Wiranata
(CCNU)
Co-authors
Prof.
Madappa Prakash
(Ohio University)
Volker Koch
(LBNL)
Xin-Nian Wang
(Lawrence Berkeley National Lab. (US))
