1,721,173 research outputs found
The relevance of center vortices
No full textWe show remnants of chiral symmetry breaking in the center-projected theory.
We construct and study an unambiguous definition of center vortices
Lambda-parameter of lattice QCD with the overlap-Dirac operator
No full textWe compute the ratio between the scale
parameter , associated with a lattice formulation of QCD using the
overlap-Dirac operator, and of the
renormalization scheme. To this end, the necessary one-loop relation between
the lattice coupling and the coupling renormalized in the scheme is calculated, using the lattice background field technique
Improved multiboson algorithm
No full textWe compare the performance of an UV-filtered Multiboson algorithm, including a global quasi-heatbath update, to the standard Hybrid Monte Carlo algorithm in full QCD with two flavours of Wilson fermions
The Role of Center Vortices in QCD
No full textCenter vortices are unambiguously identified after Laplacian Center Gauge
fixing and their influence on confinement and chiral symmetry breaking is
investigated on a sample of SU(2) configurations at zero and finite
temperature
Efficiency of the UV-filtered multiboson algorithm
No full textWe study the efficiency of an improved multiboson algorithm with two flavors of Wilson fermions in a realistic physical situation (beta = 5.60,k = 0.156 on a 16^3 x 24 lattice). The performance of this exact algorithm is compared with that of a state-of-the-art HMC algorithm: a considerable improvement is obtained for the plaquette auto-correlation time, while the two algorithms appear similarly efficient at decorrelating the topological charge
Efficiency of the UV-filtered Multiboson algorithm
No full textWe study the efficiency of an improved Multiboson algorithm with two flavours
of Wilson fermions in a realistic physical situation (, on a lattice). The performance of this exact algorithm
is compared with that of a state-of-the-art HMC algorithm: a considerable
improvement is obtained for the plaquette auto-correlation time, while the two
algorithms appear similarly efficient at decorrelating the topological charge
‘Tracing mantic genealogies in Homer and in the Hesiodic corpus (frr. 25, 37, 136 M-W): Polyidus and his family’
No full textThe present paper intends to confront a small number of fragments scattered under different headings in the edition of the fragments of the Hesiodic poem 'Catalogue of Women', although they deal with the same heroic figures, namely the seer Melampus and his progeny. Melampus was a key figure not only in shaping the mantic traditions of heroic Greece down to Hellenistic times, but more generally in playing a central role in the complex mythical, epic and historical mapping of the North-eastern Peloponnese and beyond. It is intended as a case-study which deals with the complex interactions between indirect and direct traditions, between poetic texts (Homer, Hesiod, lyric poetry) and their re-use for mythographic purposes, as well as among fluid concurrent ancient versions
One-loop renormalization of fermionic currents with the overlap-Dirac operator
No full textWe compute the one-loop lattice renormalization of the two-quark operators
, where denotes the generic Dirac matrix, for
the lattice formulation of QCD using the overlap-Dirac operator.
We also study the renormalization of quark bilinears which are more extended
and have better chiral properties.
Finally, we present improved estimates of these renormalization constants,
coming from cactus resummation and from mean field perturbation theory
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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