TL;DR
This paper reviews lattice QCD evidence of vacuum defects related to confinement, discusses their properties and significance, and introduces the concept of 'quantum numbers' of these defects, drawing historical analogies.
Contribution
It provides a synthesis of existing data on vacuum defects in lattice QCD and introduces the novel idea of their 'quantum numbers' with historical context.
Findings
Vacuum defects occupy a vanishing fraction of space
Defects are linked to confinement and nonperturbative phenomena
Introduction of 'quantum numbers' for defects
Abstract
There is accumulating evidence in lattice QCD that attempts to locate confining fields in vacuum configurations bring results explicitly depending on tha lattice spacing (that is, ultraviolet cut off). Generically, one deals with low-dimensional vacuum defects which occupy a vanishing fraction of the total four-dimensional space. We review briefly existing data on the vacuum defects and their significance for confinement and other nonperturbative phenomena. We introduce the notion of `quantum numbers' of the defects and draw an analogy, rather formal one, to developments which took place about 50 years ago and were triggered by creation of the Sakata model.
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