Results 131 to 140 of about 3,202 (225)
Nonperturbative QCD Vacuum Effects in Nonlocal Quark Dynamics [PDF]
, 2007 A straightforward calculation reveals the essentially nonlocal character of the leading heavy Q ¯ Q interaction arising from nonperturbative gluon field correlations in the model of a fluctuating QCD vacuum.
Ken Williams General, Ken Williams
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Complex eigenvalue instantons and the Fredholm determinant expansion in the Gross-Witten-Wadia model
Journal of High Energy PhysicsWe study the leading nonperturbative corrections to the strong-coupling (ungapped) phase of the Gross-Witten-Wadia (GWW) integral over unitary matrices, to one-loop order.
Dan Stefan Eniceicu +2 more
doaj +1 more source
What can be measured asymptotically?
Journal of High Energy PhysicsWe consider asymptotic observables in quantum field theories in which the S-matrix makes sense. We argue that in addition to scattering amplitudes, a whole compendium of inclusive observables exists where the time-ordering is relaxed.
Simon Caron-Huot +3 more
doaj +1 more source
Nonperturbative effects of Topological Theta-term
, 2011 We study the effects of a topological Theta-term on 2+1 dimensional principal chiral models (PCM), which are nonlinear sigma models defined on Lie group manifolds. We find that when Theta = pi, the nature of the disordered phase of the principal chiral model is strongly affected by the topological term: it is either a gapless conformal field theory, or
Xu, Cenke, Ludwig, Andreas W. W.
openaire +2 more sources
Nonperturbative QCD Vacuum Effects in Nonlocal Quark Dynamics [PDF]
, 1997 A straightforward calculation reveals the essentially nonlocal character of the leading heavy Q¯Q interaction arising from nonperturbative gluon field correlations in the model of a fluctuating QCD vacuum. In light of this quarkonium spin splitting ratio
Williams, Ken
core +1 more source
Precocious scaling and nonperturbative effects in QCD
Zeitschrift für Physik C Particles and Fields, 1983 The onset of nonperturbative effects in QCD is studied in two ways: (1) by means of the nonvanishing vacuum expectation value of 〈g2F2〉 introduced by Shifman, Vainshtein and Zakharov; (2) using a finite energy sum rule (FESR) for the renormalization group function β.
openaire +1 more source
Nonperturbative region of effective strong coupling
, 2013 In the framework of Poincaré covariant quark model the behavior of running coupling constant $α_{s}\left(Q^{2}\right)$ is considered in $Q < 1 \mbox{GeV}$ region. An analysis was carried out for pseudoscalar and vector mesons with lepton decay constants, masses (obtained from model dependent) and nucleon spin rules required to match their ...
openaire +2 more sources
Unruh-De Witt detectors, Bell-CHSH inequality and Tomita-Takesaki theory
Journal of High Energy PhysicsThe interaction between Unruh-De Witt spin 1/2 detectors and a real scalar field is scrutinized by making use of the Tomita-Takesaki modular theory as applied to the Von Neumann algebra of the Weyl operators.
F. M. Guedes +3 more
doaj +1 more source
Nonperturbative effects on the string world sheet
Nuclear Physics B, 1986 M. DINE +3 more
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Exciton-exciton correlation in the ultrafast nonlinear optical response in the nonperturbative regime [PDF]
, 2001 The ultrafast nonlinear optical response of semiconductor-microcavities (SMCs) in the nonperturbative regime is attracting growing interest for exploring fundamental light-matter interactions in many-particle quantum systems, as well as for the future ...
Di Stefano, Omar +2 more
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