1,221 research outputs found
Duals of U(N) LGT with staggered fermions
Various approaches to construction of dual formulations of non-abelian
lattice gauge theories are reviewed. In the case of U(N) LGT we use a theory of
the Weingarten functions to construct a dual formulation. In particular, the
dual representations are constructed 1) for pure gauge models in all
dimensions, 2) in the strong coupling limit for the models with arbitrary
number of flavours and 3) for two-dimensional U(N) QCD with staggered fermions.
Applications related to the finite temperature/density QCD are discussed.Comment: 8 pages, Proceedings for the 35th International Symposium on Lattice
Field Theory (Lattice 2017
Description of texts of auxiliary programs for processing video information. Part 2: SUODH program of automated separation of quasihomogeneous formations
The algorithm, block diagram, complete text, and instructions are given for the use of a computer program to separate formations whose spectral characteristics are constant on the average. The initial material for operating the computer program presented is video information in a standard color-superposition format
Fresh look on triality
Investigating the symmetry in Quantum Chromodynamics (QCD) we show that
full QCD with a vacuum of vanishing baryonic number does not lead to metastable
phases. Rather in QCD with dynamical fermions, the degeneracy of phases
manifests itself in observables without open triality.Comment: 9 pages, 0 figures, latex, IK-TUW-Preprint 930840
ARPES on HTSC: simplicity vs. complexity
A notable role in understanding of microscopic electronic properties of high
temperature superconductors (HTSC) belongs to angle resolved photoemission
spectroscopy (ARPES). This technique supplies a direct window into reciprocal
space of solids: the momentum-energy space where quasiparticles (the electrons
dressed in clouds of interactions) dwell. Any interaction in the electronic
system, e.g. superconducting pairing, leads to modification of the
quasi-particle spectrum--to redistribution of the spectral weight over the
momentum-energy space probed by ARPES. A continued development of the technique
had an effect that the picture seen through the ARPES window became clearer and
sharper until the complexity of the electronic band structure of the cuprates
had been resolved. Now, in an optimal for superconductivity doping range, the
cuprates much resemble a normal metal with well predicted electronic structure,
though with rather strong electron-electron interaction. This principal
disentanglement of the complex physics from complex structure reduced the
mystery of HTSC to a tangible problem of interaction responsible for
quasi-particle formation. Here we present a short overview of resent ARPES
results, which, we believe, denote a way to resolve the HTSC puzzle.Comment: A review written for a special issue of FN
Compatibility of Gauss maps with metrics
We give necessary and sufficient conditions on a smooth local map of a
Riemannian manifold into the sphere to be the Gauss map of an
isometric immersion , . We briefly discuss the case of
general as wellComment: 14 pages, no figure
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