5 papers · 1 filter
Integrable models with unstable particles
O. A. Castro-Alvaredo, A. Fring
We review some recent results concerning integrable quantum field theories in 1+1 space-time dimensions which contain unstable particles in their spectrum. Recalling first the main…
On the absence of simultaneous reflection and transmission in integrable impurity systems
O. A. Castro-Alvaredo, A. Fring, F. Göhmann
We establish that the Yang-Baxter equations in the presence of an impurity can in general only admit solutions of simultaneous tranmission and reflection when the transmission and…
Thermodynamic Bethe ansatz and form factors for the homogeneous sine-Gordon models
A. Fring
We provide a brief characterization of the main features of the homogeneous sine-Gordon models and discuss a general construction principle for colour valued S-matrices, associated…
Form Factors in Affine Toda Field Theories
A. Fring
I briefly review the properties of classical affine Toda field theories and indicate how some of this features survive in the quantum theory on-shell. I demonstrate how this knowle…
Couplings in Affine Toda Field Theories
A. Fring
We present a systematic derivation for a general formula for the n-point coupling constant valid for affine Toda theories related to any simple Lie algebra {\bf g}. All n-point cou…