Finite and macroscopic loop decomposition conjecture

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Let (Λ,E)(\Lambda,\mathcal E) be a finite periodic box, let β>0\beta>0, and let L1(ω),L2(ω),…L_1(\omega),L_2(\omega),\ldots be the loop lengths in decreasing order. The normalized loop lengths are Li(ω)/(β∣Λ∣)L_i(\omega)/(\beta|\Lambda|). Finite and macroscopic loop decomposition conjecture. There exists ν∈[0,1]\nu\in[0,1] such that

lim⁡K→∞lim⁡∣Λ∣→∞∑i:Li(ω)<KLi(ω)β∣Λ∣=1−ν\lim_{K\to\infty}\lim_{|\Lambda|\to\infty}\sum_{i:L_i(\omega)<K}\frac{L_i(\omega)}{\beta|\Lambda|}=1-\nu

and

lim⁡k→∞lim⁡∣Λ∣→∞∑i=1kLi(ω)β∣Λ∣=ν.\lim_{k\to\infty}\lim_{|\Lambda|\to\infty}\sum_{i=1}^{k}\frac{L_i(\omega)}{\beta|\Lambda|}=\nu.

Thus only finite and macroscopic loops contribute in the thermodynamic limit. The conjecture is known with ν=0\nu=0 in dimensions d=1,2d=1,2 and at high temperature in d≥3d\geq3; it is expected that ν>0\nu>0 for sufficiently low temperature in dimensions d≥3d\geq3.

References

Primary source

Daniel Ueltschi, “Quantum Heisenberg models and random loop representations”, arXiv:1211.4141 (2012).

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