| Summary |
Quark-gluon plasma (QGP) is a state of matter that is formed from relativistic heavy-ion collisions and also in the early universe. The quarks and gluons as quasi-free particles resemble an expanding viscous liquid under extremely high temperatures and densities. The shear viscosity, [eta], of the QGP under isotropic scatterings in full equilibrium (meaning thermal and chemical equilibrium) is already known analytically and numerically. Analytically, the viscosity obtained via the Chapman-Enskog (CE) method agrees well with the numerical Green-Kubo values for the viscosity under anisotropic scatterings as well as isotropic scatterings. In this thesis, we use the CE formula, along with other approximation methods, for viscosity to derive [eta] / s and compare the analytical curves with the numerical values for forward-angle scatterings. My contribution is the correction of two typos in the published CE and ModRTA formulae of viscosity and the application of all obtained formulae to three-dimensional expansion cases under full and partial equilibrium. This includes the calculations of shear viscosity, entropy density, and the [eta] / s ratio of the parton system from the AMPT model as a function of time of the parton evolution. |
| General note | Presented to the Faculty of the Department of Physics |
| General note | Advisor: Zi-Wei Lin |
| General note | Title from PDF t.p. (viewed December 6, 2023). |
| Dissertation note | M.S. East Carolina University 2022 |
| Bibliography note | Includes bibliographical references. |
| Technical details | System requirements: Adobe Reader. |
| Technical details | Mode of access: World Wide Web. |
| Genre/form | dissertations. |
| Genre/form | Academic theses. |
| Genre/form | Academic theses. |
| Genre/form | Thèses et écrits académiques. |
