Speaker
Description
18+2'
We have explored the influence of angular velocity on the shear and bulk viscosities of a rotating QCD medium. In the noncentral events of the relativistic heavy ion collisions, the resulting QCD medium acquires finite angular momentum, giving rise to a finite angular velocity. This rotational motion can notably alter various properties of the hot QCD medium, including the viscous properties. Thus, there exist phenomenological consequences of such rotation on the shear and bulk viscosities of the medium. Using the recently developed novel relaxation time approximation in the relativistic Boltzmann transport equation and incorporating the influence of finite angular velocity, we have calculated the shear and bulk viscous coefficients of the rotating QCD medium. Additionally, we have compared these viscous coefficients with their counterparts in the standard relaxation time approximation within the kinetic theory approach. Our analysis reveals that the introduction of rotation increases both shear and bulk viscosities, suggesting an enhanced momentum transfer within the medium and greater fluctuations in local pressure. This rotational impact on the shear and bulk viscosities is more conspicuous at low temperatures than at high temperatures. It is further observed that the use of the novel relaxation time approximation results in a reduction of the shear viscosity and an enhancement of the bulk viscosity as compared to the standard relaxation time approximation across the entire temperature range. Furthermore, our analysis shows that the rotation leaves a significant impact on some observables associated with the flow characteristic, fluid behavior and conformal symmetry of the medium. On the whole, our results suggest that the rotation serves as an essential component in understanding the viscous properties and collective behavior of the hot QCD medium.