University of Bonn

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19912026

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 1994Show all

46 papers · 1 filter

hep-th1994★ 7 cited

Manifest supersymmetry and the ADHM construction of instantons

A. Galperin, E. Sokatchev

We present the (0,4) superspace version of Witten's sigma model construction for ADHM instantons. We use the harmonic superspace formalism, which exploits the three complex structu…

hep-ph1994★ 15 cited

Weak Decays of Heavy Mesons in the Instantaneous Bethe Salpeter Approach

G. Zoeller, S. Hainzl, C. R. Muenz +1

In the framework of the instantaneous Bethe Salpeter equation we investigate weak decays of B and D mesons. Mesons are described as q-bar q states interacting via a mixture of a sc…

hep-th1994★ 56 cited

Continued Fractions and Fermionic Representations for Characters of M(p,p') minimal models

Alexander Berkovich, Barry M. McCoy

We present fermionic sum representations of the characters $χ_{r, s}^{(p, p^{'})}$ of the minimal $M (p, p^{'})$ models for all relatively prime integers $p^{'} > p$ for some allowed values of $r…

hep-ph1994★ 28 cited

Novel Pion Electroproduction Low-Energy Theorems

V. Bernard, N. Kaiser, Ulf-G. Meißner

We present novel low--energy theorems for the P--wave multipoles $2 M_{1 +} + M_{1 -}$ , $M_{1 +} - M_{1 -}$ , $E_{1 +}$ and $L_{1 \pm}$ for neutral pion electroproduction off protons. These…

hep-th1994★ 2 cited

Scaling Behavior in String Theory

Rolf Schimmrigk

In Calabi--Yau compactifications of the heterotic string there exist quantities which are universal in the sense that they are present in every Calabi--Yau string vacuum. It is sho…

hep-lat1994★ 1 cited

Nucleon masses in strong magnetic fields

H. R. Rubinstein, S. Solomon, T. Wittlich

We compute the variation of the masses of the proton and the neutron induced by the presence of a strong external magnetic field. We discuss the choice of the wave function and dif…

cond-mat1994★ 3 cited

Temperley-Lieb Words as Valence-Bond Ground States

Peter F Arndt, Thomas Heinzel, C M Yung

Based on the Temperley--Lieb algebra we define a class of one-dimensional Hamiltonians with nearest and next-nearest neighbour interactions. Using the regular representation we giv…

hep-ph1994★ 10 cited

Baryon Chiral Perturbation Theory A.D. 1994

Ulf-G. Meißner

In these lectures, the status of baryon chiral perturbation theory is reviewed. Particular emphasis is put on the two--flavor sector and the physics related to electromagnetic prob…

hep-ph1994★ 5 cited

Neutral pion photoproduction off nucleons revisited

V. Bernard, N. Kaiser, Ulf-G. Meißner

We investigate threshold pion photoproduction in the framework of heavy baryon chiral perturbation theory. We give the expansion of the electric dipole amplitude $E_{0 +}$ to three…

hep-th1994★ 17 cited

Topology and Fractional Quantum Hall Effect

Raimund Varnhagen

Starting from Laughlin type wave functions with generalized periodic boundary conditions describing the degenerate groundstate of a quantum Hall system we explictly construct $r$ d…

dg-ga1994★ 106 cited

3-manifolds with(out) metrics of nonpositive curvature

Bernhard Leeb

In the context of Thurstons geometrisation program we address the question which compact aspherical 3-manifolds admit Riemannian metrics of nonpositive curvature. We show that non-…

hep-th1994★ 4 cited

Excitation Spectrum and Correlation Functions of the Z_3-Chiral Potts Quantum Spin Chain

A. Honecker, G. von Gehlen

We study the excitation spectrum and the correlation functions of the Z_3- chiral Potts model in the massive high-temperature phase using perturbation expansions and numerical diag…

hep-ph1994

Applied Chiral Perturbation Theory

Ulf-G. Meißner

I consider some selected topics in chiral perturbation theory (CHPT) as probed at colliders such as DA $Φ$ NE. Emphasis is put on processes involving pions in the isospin zero S-wave…

hep-th1994★ 21 cited

Spectrum of transfer matrix for $U_{q} (B_{n})$ -invariant $A_{2 n}^{(2)}$ open spin chain

Simone Artz, Luca Mezincescu, Rafael I. Nepomechie

We propose an expression for the eigenvalues of the transfer matrix for the $U_{q} (B_{n})$ -invariant open quantum spin chain associated with the fundamental representation of $A^{(2)}_…

nucl-th1994★ 1 cited

Threshold Photo/Electro Pion Production - Working Group Summary

Ulf-G. Meißner, B. Schoch

We summarize the pertinent experimental and theoretical developments in the field of pion photo- and electroproduction in the threshold region. We discuss which experiments and whi…

hep-th1994★ 23 cited

The integrable hierarchy constructed from a pair of KdV-type hierarchies and its associated $W$ algebra

L. Bonora, Q. P. Liu, C. S. Xiong

For any two arbitrary positive integers ` $n$ ' and ` $m$ ', using the $m$ --th KdV hierarchy and the $(n + m)$ --th KdV hierarchy as building blocks, we are able to construct another inte…

hep-th1994★ 10 cited

Extension of the N=2 Virasoro algebra by two primary fields of dimension 2 and 3

Ralph Blumenhagen, Andreas Wisskirchen

We explicitly construct the extension of the N=2 super Virasoro algebra by two super primary fields of dimension two and three with vanishing u(1)-charge. Using a super covariant f…

hep-th1994★ 6 cited

N=2 Current Algebras for Non-Semi-Simple Groups

N. Mohammedi

We examine the problem of constructing N=2 superconformal algebras out of N=1 non-semi-simple affine Lie algebras. These N=2 superconformal theories share the property that the sup…

hep-th1994★ 51 cited

On the Classification of Modular Fusion Algebras

Wolfgang Eholzer

We introduce the notion of (nondegenerate) strong-modular fusion algebras. Here strongly-modular means that the fusion algebra is induced via Verlinde's formula by a representation…

hep-th1994★ 20 cited

Extended Toda lattice hierarchy, extended two-matrix model and c=1 string theory

L. Bonora, C. S. Xiong

We show how the two--matrix model and Toda lattice hierarchy presented in a previous paper can be solved exactly: we obtain compact formulas for correlators of pure tachyonic state…

nucl-th1994★ 25 cited

Heavy Quarkonia in the Instantaneous Bethe-Salpeter Model

J. Resag, C. R. Muenz

The heavy quarkonia (Charmonium $c\bar{c}$ and Bottomonium $b\bar{b}$) are investigated in the framework of the instantaneous BS-equation (Salpeter equation). We parametrize co…

hep-th1994★ 3 cited

A Note on Representations of N=2 SW-Algebras

R. Blumenhagen, R. Huebel

We investigate the representation theory of some recently constructed N=2 super W-algebras with two generators. Except for the central charges in the unitary minimal series of the…

hep-ph1994★ 17 cited

Higgs and Top Quark Masses in the Standard Model without Elementary Higgs Boson

V. Gribov

In this short note I present a simple calculation of the top quark and Higgs masses, based on the idea that in the standard model without elementary Higgs, the fact that the $U(1)_…

nucl-th1994★ 21 cited

Electromagnetic Meson Form Factors in the Salpeter Model

C. R. Muenz, J. Resag, B. C. Metsch +1

We present a covariant scheme to calculate mesonic transitions in the framework of the Salpeter equation for $q q ˉ$ -states. The full Bethe Salpeter amplitudes are reconstructed…