Ising model with a boundary magnetic field - an example of a boundary flow

Details Ising model with a boundary magnetic field - an example of a boundary flow Ising model with a boundary magnetic field - an example of a boundary flow

2004-10-20

arxiv.org/abs/hep-th/0410210v2

JHEP0412:058,2004

Physics

High Energy Physics

High Energy Physics - Theory

1+20 pages, Latex, 2 eps figures; v2: references added

Scientific paper

10.1088/1126-6708/2004/12/058

In hep-th/0312197 a nonperturbative proof of the g-theorem of Affleck and Ludwig was put forward. In this paper we illustrate how the proof of hep-th/0312197 works on the example of the 2D Ising model at criticality perturbed by a boundary magnetic field. For this model we present explicit computations of all the quantities entering the proof including various contact terms. A free massless boson with a boundary mass term is considered as a warm-up example.

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