منابع مشابه
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Phenomenological evidence and analytic approximations to the QCD ground state suggest a complex gluon condensate structure. Exclusion of elementary fermion excitations by the generation of infinite mass corrections is a consequence. In addition the existence of vacuum condensates in unbroken non-abelian gauge theories, endows SU(3) and higher order groups with a non-trivial structure in the man...
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We consider here the vacuum structure in QCD with both quark and gluon condensates and a variational ansatz for the ground state. The method is nonperturbative using only equal time algebra for the field operators. We then find that a constrained energy minimisation of the Hamiltonian leads to a QCD vacuum with both quark and gluon condensates for αs > αc = 0.62. Pion decay constant and the cha...
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We discuss how the vacuum model of Celenza and Shakin with a squeezed gluon condensate can explain the existence of an infrared singular gluon propagator frequently used in calculations within the global colour model. In particular, it reproduces a recently proposed QCD-motivated model where low energy chiral parameters were computed as a function of a dynamically generated gluon mass. We show ...
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This is a brief review of three strongly related topics. In recent years, significant progress was reached in understanding of vacuum and hadronic structure: quantitative role of non-perturbative tunneling, described semiclassically by “instantons” was clarified. We review recent works on the point-to-point correlation functions, comparing those obtained from phenomenology, “instanton liquid” m...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics Supplement
سال: 1998
ISSN: 0375-9687
DOI: 10.1143/ptps.131.585