Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1992-03-24
Nucl.Phys. B385 (1992) 361-394
Physics
High Energy Physics
High Energy Physics - Theory
33 pages
Scientific paper
10.1016/0550-3213(92)90105-K
We solve the RSOS($p$) models on the light--cone lattice with fixed boundary conditions by disentangling the type II representations of $SU(2)_q$, at $q=e^{i\pi/p}$, from the full SOS spectrum obtained through Algebraic Bethe Ansatz. The rule which realizes the quantum group reduction to the RSOS states is that there must not be {\it singular} roots in the solutions of the Bethe Ansatz equations describing the states with quantum spin $J<(p-1)/2$. By studying how this rule is active on the particle states, we are able to give a microscopic derivation of the lattice $S-$matrix of the massive kinks. The correspondence between the light--cone Six--Vertex model and the Sine--Gordon field theory implies that the continuum limit of the RSOS($p+1$) model is to be identified with the $p-$restricted Sine--Gordon field theory.
de Vega Hector J.
Destri Claudio
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