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arxiv: 0812.3113 · v1 · pith:ZUBOELXFnew · submitted 2008-12-16 · 🧮 math.PR · cond-mat.stat-mech· math-ph· math.MP

Critical Value of the Quantum Ising Model on Star-Like Graphs

classification 🧮 math.PR cond-mat.stat-mechmath-phmath.MP
keywords modelcriticalgraphsisingquantumstar-likevalueapproach
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We present a rigorous determination of the critical value of the ground-state quantum Ising model in a transverse field, on a class of planar graphs which we call star-like. These include the star graph, which is a junction of several copies of Z at a single point. Our approach is to use the graphical, or FK-, representation of the model, and the probabilistic and geometric tools associated with it.

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