A nested sequence of projectors (2): Multiparameter multistate statistical models, Hamiltonians, S-matrices

Details A nested sequence of projectors (2): Multiparameter multistate statistical models, Hamiltonians, S-matrices A nested sequence of projectors (2): Multiparameter multistate statistical models, Hamiltonians, S-matrices

2006-01-24

arxiv.org/abs/math/0601584v3

J.Math.Phys. 47 (2006) 053508

Mathematics

Quantum Algebra

32 pages, no figure, few mistakes are corrected

Scientific paper

10.1063/1.2197690

Our starting point is a class of braid matrices, presented in a previous paper, constructed on a basis of a nested sequence of projectors. Statistical models associated to such $N^2\times N^2$ matrices for odd $N$ are studied here. Presence of $\frac 12(N+3)(N-1)$ free parameters is the crucial feature of our models, setting them apart from other well-known ones. There are $N$ possible states at each site. The trace of the transfer matrix is shown to depend on $\frac 12(N-1)$ parameters. For order $r$, $N$ eigenvalues consitute the trace and the remaining $(N^r-N)$ eigenvalues involving the full range of parameters come in zero-sum multiplets formed by the $r$-th roots of unity, or lower dimensional multiplets corresponding to factors of the order $r$ when $r$ is not a prime number. The modulus of any eigenvalue is of the form $e^{\mu\theta}$, where $\mu$ is a linear combination of the free parameters, $\theta$ being the spectral parameter. For $r$ a prime number an amusing relation of the number of multiplets with a theorem of Fermat is pointed out. Chain Hamiltonians and potentials corresponding to factorizable $S$-matrices are constructed starting from our braid matrices. Perspectives are discussed.

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