Collective Flows in a Transport Approach

We introduce a transport approach at fixed shear viscosity to entropy ratio eta/s to study the generation of collective flows in ultra-relativistic heavy-ion collisions. Transport theory supplies a covariant approach valid also at large eta/s and at intermediate transverse momentum PT, where deviations from equilibrium is no longer negligible. Such an approach shows that at RHIC energies a temperature dependent ids enhances significantly the v(4)/v(2)(2) respect to the case of constant eta/s. Furthermore if NJL chiral dynamics is self-consistently implemented we show that it does not modify the relation between v(2) and eta/s.