期刊
PHYSICAL REVIEW D
卷 82, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.025021
关键词
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资金
- Research-Foundation Flanders (FWO Vlaanderen)
- FAPERJ, Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro [E-26/100.615/2007]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq-Brazil)
- SR2-UERJ
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- FWF [W1203-N08]
Restricting the functional integral to the Gribov region Omega leads to a deep modification of the behavior of Euclidean Yang-Mills theories in the infrared region. For example, a gluon propagator of the Gribov type, k(2) / k(4) + (gamma) over cap (4), can be viewed as a propagating pair of unphysical modes, called here i-particles, with complex masses +/- i (gamma) over cap (2). From this viewpoint, gluons are unphysical and one can see them as being confined. We introduce a simple toy model describing how a suitable set of composite operators can be constructed out of i-particles whose correlation functions exhibit only real branch cuts, with associated positive spectral density. These composite operators can thus be called physical and are the toy analogy of glueballs in the Gribov-Zwanziger theory.
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