27 research outputs found
Operator algebra of the SL(2) conformal field theories
Structure constants of Operator Algebras for the SL(2) degenerate conformal
field theories are calculated.Comment: 10 pages, LaTeX2e, no figures, new refs and minor change
Notes on SL(2) conformal fields theories. Exact solution and applications
In these notes I briefly outline SL(2) degenerate conformal field theories
and their application to some related models, namely 2d gravity and N=2
discrete superconformal series.Comment: 5 pages, latex2.09, talk presented at the International Symposium on
the Theory of Elementary Particles, Buckow 1996, minor correctio
Some chiral rings of N=2 discrete superconformal series induced by SL(2) degenerate conformal field theories
By generalizing a fermionic construction, a natural relation is found between
SL(2) degenerate conformal field theories and some N=2 discrete superconformal
series. These non-unitary models contain, as a subclass, N=2 minimal models.
The construction permits one to investigate the properties of chiral operators
in the N=2 models. A chiral ring reveals a close connection with underlying
quantum group structures.Comment: 19 pages, 2 figures, latex2
On 2D gravity coupled to matter in Polyakov light-cone gauge
A new formulation of matter coupled to 2D gravity is proposed. This
model, being closely analogous to one in the Polyakov light-cone gauge,
possesses well defined global properties which allow to calculate correlation
functions. As an example, the three point correlation functions of discrete
states are found.Comment: 8 pages, LaTeX2e, no figure
Towards a Field Theory of the Plateau Transition
We suggest a procedure for calculating correlation functions of the local
densities of states (DOS) at the plateau transitions in the Integer Quantum
Hall effect (IQHE). We argue that their correlation functions are appropriately
described in terms of the SL()/SU(2) WZNW model (at the usual Ka{\v
c}--Moody point and with the level ). In this model we have
identified the operators corresponding to the local DOS, and derived the
partial differential equation determining their correlation functions. The OPEs
for powers of the local DOS obtained from this equation are in agreement with
available results.Comment: typos corrected, a revised versio
Protonation and Photocatalytic Activity of the Rb 2
The Rb2La2Ti3O10 layered oxide was synthesized by the solid-state method. Three phases with different protonation degrees and intercalated water contents were obtained from the initial compound by the treatment with distilled water and hydrochloric acid. The obtained samples were characterized by powder X-ray diffraction, SEM, X-ray microanalysis, BET, DRS, and TG. It was found that the complete ion exchange of Rb+ for H+ in the layered oxide Rb2La2Ti3O10 proceeds through the formation of two metastable intermediate phases with average protonation degrees of 0.5 and 0.75, which successively transform from one to another. Each of these phase transformations is accompanied not only by the contraction of the interlayer distance but also by the displacement of adjacent perovskite layers by 1/2 of the cell parameter which results in the change in the space group. The photocatalytic activity of obtained samples decreases with the increase in the protonation degree, which correlates with the decrease in the intercalated water content
Fermions in the harmonic potential and string theory
We explicitly derive collective field theory description for the system of
fermions in the harmonic potential. This field theory appears to be a coupled
system of free scalar and (modified) Liouville field. This theory should be
considered as an exact bosonization of the system of non-relativistic fermions
in the harmonic potential. Being surprisingly similar to the world-sheet
formulation of c=1 string theory, this theory has quite different physical
features and it is conjectured to give space-time description of the string
theory, dual to the fermions in the harmonic potential. A vertex operator in
this theory is shown to be a field theoretical representation of the local
fermion operator, thus describing a D0 brane in the string language. Possible
generalization of this result and its derivation for the case of c=1 string
theory (fermions in the inverse harmonic potential) is discussed.Comment: 29 pages, 4 figures, LaTeX2e. v2 - minor correction
Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES
We present measurements of exclusive ensuremathπ+,0 and η production in pp reactions at 1.25GeV and 2.2GeV beam kinetic energy in hadron and dielectron channels. In the case of π+ and π0 , high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of Δ (1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp → pp η , since controversial data exist at 2.0GeV; we find \ensuremathσ=0.142±0.022 mb. Using the dielectron channels, the π0 and η Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions