Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-04-02
Nucl.Phys. B696 (2004) 445-467
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, 9 figures, Latex 2e. v2: typos fixed and comments added. v3: Published version: minor typos corrected, numerical res
Scientific paper
10.1016/j.nuclphysb.2004.06.045
The g-function was introduced by Affleck and Ludwig in the context of critical quantum systems with boundaries. In the framework of the thermodynamic Bethe ansatz (TBA) method for relativistic scattering theories, all attempts to write an exact integral equation for the off-critical version of this quantity have, up to now, been unsuccesful. We tackle this problem by using an n-particle cluster expansion, close in spirit to form-factor calculations of correlators on the plane. The leading contribution already disagrees with all previous proposals, but a study of this and subsequent terms allows us to deduce an exact infrared expansion for g, written purely in terms of TBA pseudoenergies. Although we only treat the thermally-perturbed Ising and the scaling Lee-Yang models in detail, we propose a general formula for g which should be valid for any model with entirely diagonal scattering.
Dorey Patrick
Fioravanti Davide
Rim Chaiho
Tateo Roberto
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