scholarly journals INSTANTON INFRA-RED STABILIZATION IN THE NONPERTURBATIVE QCD VACUUM

2003 ◽  
Author(s):  
N. O. AGASIAN ◽  
S. M. FEDOROV
Keyword(s):  
Qcd Vacuum ◽  
Infra Red ◽  
Nonperturbative Qcd

scholarly journals Instantons in the nonperturbative QCD vacuum

2004 ◽  
Vol 67 (2) ◽  
pp. 376-390 ◽  
Author(s):  
N. O. Agasian ◽  
S. M. Fedorov
Keyword(s):  
Qcd Vacuum ◽  
Nonperturbative Qcd

scholarly journals Confinement Mechanism in the Field Correlator Method

2009 ◽  
Vol 2009 ◽  
pp. 1-30 ◽  
Author(s):  
Yu. A. Simonov ◽  
V. I. Shevchenko
Keyword(s):  
Critical Temperature ◽  
Green's Function ◽  
Gluon Condensate ◽  
String Tension ◽  
The Other ◽  
Vacuum Fluctuations ◽  
Qcd Vacuum ◽  
Other Hand ◽  
Self Consistent ◽  
Nonperturbative Qcd

Confinement in QCD results from special properties of vacuum fluctuations of gluon fields. There are two numerically different scales, characterizing nonperturbative QCD vacuum dynamics: “small” one, corresponding to gluon condensate, critical temperature etc, which is about 0.1–0.3 GeV, and a “large” one, given by inverse confining string width, glueball and gluelump masses, and so forth, which is about 1.5–2.5 GeV. We discuss the origin of this hierarchy in a picture where confinement is ensured by quadratic colorelectric field correlators of the special type. These correlators, on the other hand, can be calculated via gluelump Green's function, whose dynamics is defined by the correlators themselves. In this way one obtains a self-consistent scheme, where string tension can be expressed in terms ofΛQCD.

DYONIC FLUX TUBE STRUCTURE OF NONPERTURBATIVE QCD VACUUM

2003 ◽  
Vol 18 (09) ◽  
pp. 1623-1635 ◽  
Author(s):  
H. C. CHANDOLA ◽  
H. C. PANDEY
Keyword(s):  
Flux Tube ◽  
Input Parameter ◽  
Gauge Potential ◽  
Field Equations ◽  
Pair Correlations ◽  
Qcd Vacuum ◽  
Nonperturbative Qcd ◽  
Magnetic Symmetry ◽  
Tube Structure ◽  
Dyonic Condensation

We study the flux tube structure of the nonperturbative QCD vacuum in terms of its dyonic excitations by using an infrared effective Lagrangian and show that the dyonic condensation of QCD vacuum has a close connection with the process of color confinement. Using the fiber bundle formulation of QCD, the magnetic symmetry condition is presented in a gauge covariant form and the gauge potential has been constructed in terms of the magnetic vectors on global sections. The dynamical breaking of the magnetic symmetry has been shown to lead the dyonic condensation of QCD vacuum in the infrared energy sector. Deriving the asymptotic solutions of the field equations in the dynamically broken phase, the dyonic flux tube structure of QCD vacuum is explored which has been shown to lead the confinement parameters in terms of the vector and scalar mass modes of the condensed vacuum. Evaluating the charge quantum numbers and energy associated with the dyonic flux tube solutions, the effect of electric excitation of monopole is analyzed using the Regge slope parameter (as an input parameter) and an enhancement in the dyonic pair correlations and the confining properties of QCD vacuum in its dyonically condensed mode has been demonstrated.

scholarly journals Nonzero mean squared momentum of quarks in the nonperturbative QCD vacuum

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
Li-Juan Zhou ◽  
Leonard S. Kisslinger ◽  
Wei-xing Ma
Keyword(s):  
Qcd Vacuum ◽  
Nonperturbative Qcd ◽  
Nonzero Mean

scholarly journals Hadron resonance gas and nonperturbative QCD vacuum at finite temperature

JETP Letters ◽  
2003 ◽  
Vol 78 (10) ◽  
pp. 607-610 ◽  
Author(s):  
N. O. Agasian ◽  
S. M. Fedorov
Keyword(s):  
Finite Temperature ◽  
Qcd Vacuum ◽  
Nonperturbative Qcd

PROTON SPIN WITHIN NONPERTURBATIVE QCD

1993 ◽  
Vol 08 (04) ◽  
pp. 603-651 ◽  
Author(s):  
A.E. DOROKHOV ◽  
N.I. KOCHELEV ◽  
YU. A. ZUBOV
Keyword(s):  
Proton Spin ◽  
Qcd Vacuum ◽  
Nonperturbative Qcd ◽  
Spin Crisis

A review of various approaches to the problem of the proton spin is presented. Arguments are given in favor of the idea that the answer to the “spin crisis” is to be found in fundamental nonperturbative properties of the QCD vacuum.

INTERACTION BETWEEN COLOUR-SINGLET HADRONS FROM NONPERTURBATIVE QCD

1990 ◽  
Vol 05 (19) ◽  
pp. 3787-3799
Author(s):  
ROLAND C. WARNER ◽  
G.C. JOSHI
Keyword(s):  
Nonperturbative Effects ◽  
Perturbative Qcd ◽  
Atomic Physics ◽  
Van Der Waals ◽  
Van Der Waals Interaction ◽  
Many Body ◽  
Qcd Vacuum ◽  
Dilute Gas ◽  
Nonperturbative Qcd ◽  
Nontrivial Topology

We present a nonperturbative QCD contribution to interactions between separated coloursinglet hadrons, arising from the nontrivial topology of the QCD vacuum. We have calculated the effect of the structure of the vacuum (modelled here as a dilute gas of instantons) on hadron propagation, as a way of studying at least some nonperturbative effects. We find that a nonperturbative interaction arises which is familiar to us from our earlier studies of many-body potentials in multiquark systems. This interaction is distinct from those earlier perturbative QCD calculations which bear a direct analogy to the van der Waals interaction of atomic physics.

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