# XIIIth Quark Confinement and the Hadron Spectrum

31 July 2018 to 6 August 2018
Maynooth University
Europe/Dublin timezone

## Confinement, infrared screening of the QCD vacuum density and small cosmological constant

3 Aug 2018, 15:20
20m
Hall E (Arts Bldg.)

### Hall E

#### Arts Bldg.

Talk A: Vacuum structure and confinement

### Speaker

Roman Pasechnik (Lund university)

### Description

The dynamical cancellation of the vacuum energy of the QCD sector in the infrared regime is a relevant problem for both particle physics and cosmology. We find an argument related to the existence of a Z_2-symmetry for the renormalization group flow derived from the bare Yang-Mills Lagrangian, and show that the cancellation of the vacuum energy may arise motivated both from the renormalization group flow solutions and the effective Yang-Mills action. At the cosmological level, we explore the stability of the electric and magnetic attractor solutions, both within and beyond the perturbation theory, and find that thanks these latter the cancellation between the electric and the magnetic vacua components is achieved at macroscopic space and time separations. This implies the disappearance of the conformal anomaly in the classical limit of an effective Yang-Mills theory and the emergence of novel space-time instanton-like objects with possibly important implications for real-time dynamics of QCD confinement.

### Primary authors

Roman Pasechnik (Lund university) Dr Antonino Marciano (Fudan U.) Dr Andrea Addazi (Fudan U.)