Conveners
Vacuum structure and confinement
- Claudio Bonanno (ITP, University of Bern)
Vacuum structure and confinement
- Akihiro Shibata
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Orlando Oliveira29/07/2026, 09:002Vacuum structure and confinement
A crucial step in extracting physical predictions from lattice QCD simulations is the scale setting, i.e. the determination of the lattice spacing (a) in physical units. Herein, the relative scale setting for different β’s is discussed, using the Landau gauge gluon propagator computed with large statistical ensembles. After setting the relative scales, finite size effects are observed in the...
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Andrea Giorgieri (University of Pisa, INFN)29/07/2026, 09:201Vacuum structure and confinementContributed talk
We compute the $\Lambda$-parameter of SU($N$) Yang--Mills theories for $N=3,5,8$ using the step-scaling method. We use the gradient flow scale $t_0$ for scale setting, and we implement the step-scaling method in the twisted gradient flow scheme, a finite-volume renormalization scheme that combines twisted boundary conditions with a coupling defined via the gradient flow. By extrapolating our...
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Akio Tomiya (Tokyo Woman’s Christian University)29/07/2026, 09:401Vacuum structure and confinementContributed talk
We study topology readout in $SU(3)$ Yang--Mills theory using several gradient-flow actions. We monitor the integerness of the gluonic topological charge $Q(t)$, admissibility-related diagnostics, and the matching between $\mathrm{round} Q(t)$ and the overlap Dirac index as probes of topological sector identification. We compare Wilson, tree-level Symanzik, Iwasaki, and DBW2 flows on Wilson...
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Dr Okuto Morikawa (RIKEN iTHEMS)29/07/2026, 10:00Vacuum structure and confinementContributed talk
We report a lattice study of the confinement vacuum of $SU(2)$ Yang--Mills theory at $\theta=2\pi$ using Wilson--'t~Hooft loop observables. Although Yang--Mills theories at $\theta$ and $\theta+2\pi$ are unitarily equivalent, recent developments in generalized global symmetries predict that the confining vacua at $\theta=0$ and $\theta=2\pi$ are distinguished as symmetry-protected topological...
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Akihiro Shibata (KEK)29/07/2026, 10:20Vacuum structure and confinementContributed talk
The dual superconductor picture is a promising mechanism for quark confinement, and magnetic monopoles play a dominant role in quark confinement. To understand the mechanism of quark confinement, we investigate the relation between the violation of the non-Abelian Bianchi identity (VNABI), the emergence of magnetic monopoles, and confinement by using the gauge-covariant decomposition and the...
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David Ward (National Taiwan University)29/07/2026, 11:10Vacuum structure and confinement
Gauge theories with matter fields in the adjoint representation play an important role in the mechanisms of confinement due to an additional unbroken center symmetry. Assessment of the vacuum groundstate are, therefore, of primary interest in calculation of order parameters, monopole mass and center vortices. To this end, we present some results from an ongoing study of the adjoint SU(2)...
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Dario Panfalone29/07/2026, 11:303Vacuum structure and confinementContributed talk
We investigate the properties of the confining flux tube within the reconfined phase of trace-deformed $\mathrm{SU}(2)$ Yang-Mills theory in $(2+1)$ dimensions. Using lattice simulations performed above the standard deconfinement temperature, we analyze Polyakov-loop correlators to determine the ground-state energy of the effective string. Our numerical results indicate that the conventional...
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Rocco Amorosso29/07/2026, 11:501Vacuum structure and confinementContributed talk
We study the vacuum-subtracted entanglement entropy of the color flux tube between a static quark-antiquark pair in SU(2) through SU(5) (2+1)-D pure gauge theory. Using the replica trick, we examine the dependence of entanglement on temperature as well as the size and topology of the entangling region. Through analyzing these factors, we present quantitative conclusions about the nature of...
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Dr Claudio Bonanno (ITP, University of Bern)29/07/2026, 12:102Vacuum structure and confinementContributed talk
We present a lattice determination of the I = 2 pion scattering length in the large-$N$ limit. This calculation is based on the twisted Eguchi-Kawai formulation of large-$N$ QCD, and employs values of $N$ ranging from 289 up to 1156. Our findings will be compared with Chiral Perturbation Theory predictions and with previous large-$N$ lattice results obtained with standard methods and...
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