منابع مشابه
Qcd Glueball Sum Rules and Vacuum Topology
Several key problems of QCD sum rules in the spin-0 glueball channels are resolved by implementing nonperturbative short-distance physics from direct instantons and topological charge screening. A lattice-based instanton size distribution and the IR renormalization of the nonperturbative Wilson coefficients are also introduced. Results of a comprehensive quantitative sum rule analysis are revie...
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The impact of dynamical fermions on the vacuum structure of QCD is explored. Of particular interest is the topological charge correlator, 〈q(x)q(0)〉, where negative values at small x reveal a sign-alternating layered structure to the topological-charge density of the QCD vacuum. We consider large 283×96 lattices from the MILC collaboration, and develop a new gluonic definition of the topologica...
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The numerical approach to resolving the features of QCD is occasionally criticized via statements suggesting the knowledge of QCD lies “in the silicon.” What these speakers are recognizing is that there are massive amounts of data processed by today’s supercomputers in arriving at the final few bytes of information reported as QCD observables. The focus of this investigation is to further probe...
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This paper is a computation of the homotopy type of K , the space of long knots in R the same space of knots studied by Vassiliev via singularity theory. Each component of K corresponds to an isotopy class of long knot, and we ‘enumerate’ the components via the companionship trees associated to the knot. The knots with the simplest companionship trees are: the unknot, torus knots, and hyperboli...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2007
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2006.11.040