Thermodynamics of 5-flavor QCD

This thesis investigates the chiral phase transition in Quantum Chromodynamics (QCD) with five mass degenerate quark flavors. After performing lattice QCD simulations, I discuss measurements of the chiral condensate at small masses and classify the chiral phase transition. The data analysis is done via established approaches, as well as state-of-the-art machine learning means. That way, I introduce the Masked Autoregressive Flow (MAF) and the Vision Transformer (ViT) to QCD data analysis. This approach is used to identify a critical mass marking the boundary between first-order and crossover regions. Another part of this thesis analyzes scaling functions in the 3-d, Z(2), O(2) and O(4) universality classes and their finite size dependence using Monte Carlo simulations of improved ϕ⁴ models. We extract parametrizations of the Z(2) and O(2) scaling functions to high precisions by fitting data from simulations of the respective spin models.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Bielefeld

Year

2023

Author dc:creator

• Neumann, Marius

Repository record source_url

https://pub.uni-bielefeld.de/record/2983242

OAI identifier oai:identifier

oai:pub.uni-bielefeld.de:2983242