Statistical and Thermodynamical Studies of the Strongly Interacting Matter

TL;DR

This thesis explores phenomenological aspects of heavy-ion collisions, including kinetic theory generalizations, azimuthal asymmetry analysis, and the relation between spectral density and transport properties, revealing how scattering states influence fluidity.

Contribution

It introduces a generalized kinetic theory for dense systems, links initial geometrical asymmetry to particle yields, and studies spectral density effects on fluidity in strongly interacting matter.

Findings

Spectral density of scattering states enhances fluidity.

Azimuthal asymmetry relates to initial geometry.

Continuum states influence transport properties.

Abstract

In this thesis we discuss three separate analysis of various phenomenological aspects of heavy-ion collisions (HIC). The first one is a possible generalization of the kinetic theory framework for dense systems. We investigate its long-time behaviour and the properties of the equilibrium. The second discussion is about the phenomenological analysis of the azimuthal asymmetry of the particle yields in a HIC, where we link the initial stage geometrical asymmetry to the particle yields and examine the possible organizing mechanisms that could be responsible for such a relation. The third, and also the most thorough part of the thesis is about the relation of the spectral density of quasi-particle states and the macroscopic fluidity measure (the ratio of shear viscosity and the entropy density) and other transport properties of the system. We extensively study the liquid-gas crossover with the help of model spectral functions. The main conclusion is that the relative intensification of the continuum of the scattering states compared to the quasi-particle peak makes the matter more fluent.