By Geoffrey R. Grimmett (auth.)

ISBN-10: 3540328904

ISBN-13: 9783540328902

ISBN-10: 3540328912

ISBN-13: 9783540328919

The random-cluster version has emerged in recent times as a key instrument within the mathematical research of ferromagnetism. it can be seen as an extension of percolation to incorporate Ising and Potts versions, and its research is a mixture of arguments from likelihood and geometry. This systematic learn comprises debts of the subcritical and supercritical stages, including transparent statements of significant open difficulties. there's an in depth therapy of the first-order (discontinuous) part transition, in addition to a bankruptcy dedicated to purposes of the random-cluster way to different types of statistical physics.

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E∈E Proof. We follow [39, Prop. 4]. 47) 1 d µ p (X) = dp Zp ω∈ 1 Zp X (ω)ν p (ω). ω∈ N − |η(ω)| |η(ω)| − p 1− p X (ω)ν p (ω) − Zp Zp µ p (X), where Z p = d Z p /d p. Setting X = 1, we find that 0= Zp 1 µ p (|η| − p N) − , p(1 − p) Zp whence p(1 − p) d µ p (X) = µ p [|η| − p N]X − µ p (|η| − p N)µ p (X) dp = µ p (|η|X) − µ p (|η|)µ p (X) = covp (|η|, X). Let be the group of permutations of E. Any π ∈ acts10 on by πω = (ω(πe ) : e ∈ E). We say that a subgroup A of acts transitively on E if, for all pairs j, k ∈ E, there exists α ∈ A with α j = k.

For ω, ω ∈ , one may add edges one by one to η(ω) thus arriving at the unit vector 1, and then one may remove edges one by one thus arriving at ω . 8), each such transition has a strictly positive intensity, whence the chain is irreducible. It follows that the chain has unique invariant measure µ. Similar constructions are explored in Chapter 8. 5]. We follow next a similar route for pairs of configurations. Let µ1 and µ2 satisfy the hypotheses of the theorem, and let S be the set of all ordered pairs (π, ω) of configurations in satisfying π ≤ ω.

1, we shall construct a coupling κ of µ1 and µ2 such that κ(S) = 1. It is an immediate consequence that µ1 ≤st µ2 . There is a variety of couplings of measures which play roles in the theory of random-cluster measures. 45. 1. 2) for all pairs ω1 , ω2 but only for those pairs that disagree at two or fewer edges. 25). 12. 3) Theorem. 5) µ2 (ωe )µ1 (ωe ) ≥ µ1 (ωe )µ2 (ωe ), µ2 (ω )µ1 (ωe f ) ≥ ef f µ1 (ωef )µ2 (ωe ), ω∈ , e ∈ E, ω∈ , e, f ∈ E. 2) is equivalent to a condition of monotonicity on the one-point conditional distributions.

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