1,458 research outputs found
Dynamical quarks effects on the gluon propagation and chiral symmetry restoration
We exploit the recent lattice results for the infrared gluon propagator with
light dynamical quarks and solve the gap equation for the quark propagator.
Chiral symmetry breaking and confinement (intimately tied with the analytic
properties of QCD Schwinger functions) order parameters are then studied.Comment: Contribution to QCD-TNT-III: "From quarks and gluons to hadronic
matter: A bridge too far?
Pion's valence-quark GPD and its extension beyond DGLAP region
We briefly report on a recent computation, with the help of a fruitful
algebraic model, sketching the pion valence dressed-quark generalized parton
distribution and, very preliminary, discuss on a possible avenue to get
reliable results in both Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and
Efremov-Radyushkin-Brodsky-Lepage (ERBL) kinematial regions.Comment: 6 pages, 4 figures, contribution to 21st International conference on
Few-Body Problem
A brief comment on the similarities of the IR solutions for the ghost propagator DSE in Landau and Coulomb gauges
This brief note is devoted to reconcile the conclusions from a recent
analysis of the IR solutions for the ghost propagator Dyson-Schwinger equations
in Coulomb gauge with previous studies in Landau gauge.Comment: 4 pages, 1 figur
The scaling infrared DSE solution as a critical end-point for the family of decoupling ones
Both regular (the zero-momentum ghost dressing function not diverging), also
named decoupling, and critical (diverging), also named scaling, Yang-Mills
propagators solutions can be obtained by analyzing the low-momentum behaviour
of the ghost propagator Dyson-Schwinger equation (DSE) in Landau gauge. The
asymptotic expression obtained for the regular or decoupling ghost dressing
function up to the order fits pretty well the low-momentum
ghost propagator obtained through the numerical integration of the coupled
gluon and ghost DSE in the PT-BFM scheme. Furthermore, when the size of the
coupling renormalized at some scale approaches some critical value, the PT-BFM
results seems to tend to the the scaling solution as a limiting case.Comment: Presented in QCSHS09; Madrid (Spain), 30 Aug. 201
Comment on "Lattice Gluon and Ghost Propagators, and the Strong Coupling in Pure Yang-Mills Theory: Finite Lattice Spacing and Volume Effects"
The authors of ref. Phys.Rev. D94 (2016) no.1, 014502 reported about a
careful analysis of the impact of lattice artifacts on the gauge-field
propagators. In particular, they found that the low-momentum behavior of the
renormalized propagators depends on the lattice bare coupling and interpreted
this fact as the result of it being affected by finite lattice spacing
artifacts. We do not share this interpretation and present here a different and
more suitable explanation for these results
Are the low-momentum gluon correlations semiclassically determined?
We argue that low-energy gluodynamics can be explained in terms of
semi-classical Yang-Mills solutions by demonstrating that lattice gluon
correlation functions fit to instanton liquid predictions for low energies and,
after cooling, in the whole range.Comment: 4 pages, revtex
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