One-point functions in integrable quantum field theory at finite temperature

Details One-point functions in integrable quantum field theory at finite temperature One-point functions in integrable quantum field theory at finite temperature

2001-01-26

arxiv.org/abs/hep-th/0101180v1

J.Phys. A34 (2001) L161-L168

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, latex

Scientific paper

10.1088/0305-4470/34/13/102

We determine the form factor expansion of the one-point functions in integrable quantum field theory at finite temperature and find that it is simpler than previously conjectured. We show that no singularities are left in the final expression provided that the operator is local with respect to the particles and argue that the divergences arising in the non-local case are related to the absence of spontaneous symmetry breaking on the cylinder. As a specific application, we give the first terms of the low temperature expansion of the one-point functions for the Ising model in a magnetic field.

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