Abstract
The perturbation approach is used to derive the exact correlation length ξ of the dilute AL lattice models in regimes 1 and 2 for L odd. In regime 2 the A3 model is the E8 lattice realization of the two-dimensional Ising model in a magnetic field h at T = Tc. When combined with the singular part fs of the free energy the result for the A3 model gives the universal amplitude fsξ2 = 0.061 728 . . . as h → 0 in precise agreement with the result obtained by Delfino and Mussardo via the form-factor bootstrap approach.
Original language | English |
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Pages (from-to) | L479-L484 |
Journal | Journal of Physics A: Mathematical and General |
Volume | 30 |
Issue number | 15 |
DOIs | |
Publication status | Published - 7 Aug 1997 |