Spectral properties and massive fields in non-perturbative QCD

• Grant number: 24/10642-4
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: April 11, 2025
• End date: July 10, 2025
• Field of knowledge: Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
• Principal Investigator: Nathan Jacob Berkovits
• Grantee: Duive Maria Van Egmond
• Supervisor: David Dudal
• Host Institution: Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil
• Institution abroad: University of Leuven, Kulak Kortrijk (KU Leuven), Belgium
• Associated to the scholarship: 23/03722-9 - Dynamical Masses and Gauge invariance: beyond the perturbative approach., BP.PD

Abstract

Non-abelian Yang-Mills gauge theories describing the electroweak and strong interaction, cornerstones of the Standard Model, are far from completely understood. Perturbative Quantum Chromodynamics describes the high-energy region of the strong interaction successfully, but until today no coherent analytical description of the low-energy region exists. (Gauge-fixed) lattice results indicate massive behaviour of the gluon propagator in the low-energy regime. In this project, we will investigate the analytical continuation of an effective model for non-perturbative Yang-Mills theories, which accounts for massive gluons observed on the gauge-fixed lattice. This will give access to the spectral properties of these degrees of freedom in the low-energy regime of QCD.