Study of some properties of deconfined matter: Resummed perturbation theory and beyond

TL;DR

This thesis investigates various properties of the Quark-Gluon Plasma using advanced theoretical techniques like hard thermal loop effective theory and Gribov quantization to understand its behavior at high temperatures.

Contribution

It introduces a combined approach of resummed perturbation theory and nonperturbative methods to study QGP properties beyond leading order.

Findings

Calculated next-to-leading order dispersion relations for soft quarks

Determined screening masses of mesons in QGP

Analyzed drag, diffusion, and energy loss of heavy quarks in QGP

Abstract

The present thesis is devoted to the study of some of the features of the deconfined state of matter dubbed Quark-Gluon Plasma (QGP). The different properties of the extreme matter that have been studied in this thesis are next-to-leading order dispersion properties for soft-moving quarks, screening masses of mesons, drag and diffusion properties of heavy quarks, the specific shear viscosity of QGP and energy loss of heavy quarks propagating in QGP background. The theoretical techniques which are utilized in order to study these properties are mainly hard thermal loop effective theory, which is required when one is interested in studying the soft scale physics of the underlined theory QCD at finite temperatures, and the other techniques, which are utilized here is the nonperturbative resummation approach dubbed as Gribov quantization. This nonperturbative resummation deals with the magnetic scale of the theory through the Gribov mass parameter.