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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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55 papers · 1 filter
The quark propagator and quark-gluon vertex from lattice QCD at finite temperature
Jesuel Marques, Gerhard Kalusche, Tereza Mendes +3
The quark-gluon vertex is an important object of QCD. Studies have shown that this quantity is relevant for the dynamical chiral symmetry breaking pattern in the vacuum. The goal o…
Compact QED: the photon propagator, confinement and positivity violation for the pure gauge theory
Orlando Oliveira, Lee C. Loveridge, Paulo J. Silva
The lattice Landau gauge photon propagator for the pure gauge theory is revisited using large lattices. For the confined case we show that it has an associated linearly growing pot…
The analytic structure of the Landau gauge quark propagator from Padé analysis
Alexandre F. Falcão, Orlando Oliveira
The analytic structure of the 2 flavour full QCD lattice Landau gauge quark propagator is investigated with Padé approximants applied to its vector and scalar form factors. No pole…
The Schwinger function, confinement and positivity violation in pure gauge QED
Lee C. Loveridge, Orlando Oliveira, Paulo J. Silva
The lattice regularized pure gauge compact U(1) theory is an ideal laboratory to explore how confinement is realized as its phase diagram has a confined and a deconfined phase that…
Mass estimates of the SU(2) glueball from spectral methods
David Dudal, Orlando Oliveira, Martin Roelfs
The estimation of the Källén-Lehmann spectral density from gauge invariant lattice QCD two point correlation functions is proposed, and explored via an inversion strategy based on…
Lattice pure gauge compact QED in the Landau gauge: the photon propagator, the phase structure and the presence of Dirac strings
Lee C. Loveridge, Orlando Oliveira, Paulo J. Silva
In this work we investigate the lattice Landau gauge photon propagator together with the average number of Dirac strings in the compact formulation of QED for the pure gauge versio…
Another look at the Landau gauge three-gluon vertex
Guilherme T. R. Catumba, Orlando Oliveira, Paulo J. Silva
We revisit the computation of the three-gluon vertex in the Landau gauge using lattice QCD simulations with large physical volumes of (6.5 fm) and (8 fm) an…
Källén-Lehmann Spectral Representation of the Scalar SU(2) Glueball
David Dudal, Orlando Oliveira, Martin Roelfs
The estimation of the Källén-Lehmann spectral density from gauge invariant lattice QCD two point correlation functions is proposed, and explored via an appropriate inversion method…
Quark-gluon vertex from Nf=2 lattice QCD
Ayşe Kızılersü, Orlando Oliveira, Paulo J. Silva +2
We study the quark-gluon vertex in the limit of vanishing gluon momentum using lattice QCD with 2 flavors of O(a) improved Wilson fermions, for several lattice spacings and quark m…
The lattice Landau gauge photon propagator for 4D compact QED
Lee C. Loveridge, Orlando Oliveira, Paulo J. Silva
In this work we report on the Landau gauge photon propagator computed for pure gauge 4D compact QED in the confined and deconfined phases and for large lattices volumes: , $4…
tensor representations for the lattice Landau gauge gluon propagator and the estimation of lattice artefacts
Guilherme T. R. Catumba, Orlando Oliveira, Paulo J. Silva
The use of lattice tensor representations is explored to investigate the lattice Landau gauge gluon propagator for the pure SU(3) Yang-Mills gauge theory in 4D. The analysis of sev…
The analytic structure of the lattice Landau gauge gluon and ghost propagators
Alexandre F. Falcão, Orlando Oliveira, Paulo J. Silva
Starting from the lattice Landau gauge gluon and ghost propagator data we use a sequence of Padé approximants, identify the poles and zeros for each approximant and map them into t…
Finite Temperature Landau Gauge Lattice Quark Propagator
Orlando Oliveira, Paulo J. Silva
The quark propagator at finite temperature is investigated using quenched gauge configurations. The propagator form factors are investigated for temperatures above and below the gl…
Spectral representation of lattice gluon and ghost propagators at zero temperature
David Dudal, Orlando Oliveira, Martin Roelfs +1
We consider the analytic continuation of Euclidean propagator data obtained from 4D simulations to Minkowski space. In order to perform this continuation, the common approach is to…
Faddeev-Popov Matrix in Linear Covariant Gauge: First Results
Attilio Cucchieri, David Dudal, Tereza Mendes +3
We discuss a possible definition of the Faddeev-Popov matrix for the minimal linear covariant gauge on the lattice and present first results for the ghost propagator. We consider Y…
Quark propagator with two flavors of O(a)-improved Wilson fermions
Orlando Oliveira, Paulo J. Silva, Jon-Ivar Skullerud +1
We compute the Landau gauge quark propagator from lattice QCD with two flavors of dynamical O(a)-improved Wilson fermions. The calculation is carried out with lattice spacings rang…
High Precision Statistical Landau Gauge Lattice Gluon Propagator Computation vs. the Gribov-Zwanziger approach
David Dudal, Orlando Oliveira, Paulo J. Silva
The compatibility of the results from the Gribov-Zwanziger tree level prediction and lattice simulations, using large statistical ensembles, for the Landau gauge gluon propagator a…
Finite temperature gluon propagator in Landau gauge: non-zero Matsubara frequencies and spectral densities
Paulo J. Silva, Orlando Oliveira, David Dudal +1
We report on the lattice computation of the Landau gauge gluon propagator at finite temperature, including the non-zero Matsubara frequencies. Moreover, the corresponding Källén-Le…
Reply to "Comment on 'Lattice Gluon and Ghost Propagators, and the Strong Coupling in Pure SU(3) Yang-Mills Theory: Finite Lattice Spacing and Volume Effects' "
Anthony G. Duarte, Orlando Oliveira, Paulo J. Silva
The quenched gluon and ghost propagator data published in [1] is reanalysed following the suggestion of [2] to resolve the differences between the infrared data of the simulations.…
Approximate dual representation for Yang-Mills SU(2) gauge theory
R. Leme, O. Oliveira, G. Krein
An approximate dual representation for non-Abelian lattice gauge theories in terms of a new set of dynamical variables, the plaquette occupation numbers (PONs) that are natural num…
Gluons at finite temperature
P. J. Silva, O. Oliveira, D. Dudal +2
The gluon propagator is investigated at finite temperature via lattice simulations. In particular, we discuss its interpretation as a massive-type bosonic propagator. Moreover, we…
Gluon and Ghost Dynamics from Lattice QCD
O. Oliveira, A. G. Duarte, D. Dudal +1
The two point gluon and ghost correlation functions and the three gluon vertex are investigated, in the Landau gauge, using lattice simulations. For the two point functions, we dis…
Further Evidence For Zero Crossing On The Three Gluon Vertex
Anthony G. Duarte, Orlando Oliveira, Paulo J. Silva
The three gluon one particle irreducible function is investigated using lattice QCD simulations over a large region of momentum in the Landau gauge for four dimensional pure Yang-M…
Lattice Gluon and Ghost Propagators, and the Strong Coupling in Pure SU(3) Yang-Mills Theory: Finite Lattice Spacing and Volume Effects
Anthony G. Duarte, Orlando Oliveira, Paulo J. Silva
The dependence of the Landau gauge two point gluon and ghost correlation functions on the lattice spacing and on the physical volume are investigated for pure SU(3) Yang-Mills theo…