Temperature dependent transport coefficients in a dynamical holographic QCD model

Transport Coefficients in Hot Qcd

I give a physical explanation of what shear viscosity is, and what physics determines its value. Then I explain why determining the shear viscosity of the Quark-Gluon Plasma is interesting. I outline the leading-order calculation of the QGP shear viscosity (and baryon number diffusion constant), explaining why the quite complicated physics of parton splitting and Landau-Pomeranchuk-Migdal inter...

Heavy quarkonium in a holographic QCD model

Encouraged by recent developments in AdS/QCD models for light quark system, we study heavy quarkonium in the framework of the AdS/QCD models. We calculate the masses of cc̄ vector meson states using the AdS/QCD models at zero and at finite temperature. Among the models adopted in this work, we find that the soft wall model most suitably describes the heavy quark states at zero temperature. At fi...

On the Navier-stokes Equations with Temperature-dependent Transport Coefficients

1D compressible flow with temperature dependent transport coefficients

We establish existence of global-in-time weak solutions to the one dimensional, compressible Navier-Stokes system for a viscous and heat conducting ideal polytropic gas (pressure p = Kθ/τ , internal energy e = cvθ), when the viscosity μ is constant and the heat conductivity κ depends on the temperature θ according to κ(θ) = κ̄θ , with 0 ≤ β < 3 2 . This choice of degenerate transport coefficient...

Toward a more realistic holographic QCD model

By matching the Dp − Dq system in type II superstring theory with the Regge trajectories of vector and axial-vector meson spectra, a possible 5-dimension metric of a Dp−Dq soft-wall model has been determined. The dependence of the metric parameters on Regge trajectory parameters has been demonstrated. It is shown that the models defined in Dp brane background for p = 3 or 4 can be consistent wi...