Low- and high-temperature behavior of the interacting path process

Let Υ\Upsilon be the space of polygonal paths equipped with the push-forward a priori probability measure pp, let ff be the potential

f(γ1,γ2,)=n=1J(n)dHα(γ1,γn)1+dHα(γ1,γn),f(\gamma_1,\gamma_2,\ldots)=-\sum_{n=1}^{\infty}J(n)\frac{d_{\mathbb{H}}^{\alpha}(\gamma_1,\gamma_n)}{1+d_{\mathbb{H}}^{\alpha}(\gamma_1,\gamma_n)},

where J(n)0J(n)\geq 0 tends to zero sufficiently fast, 0<α<10<\alpha<1, and dHd_{\mathbb{H}} is the Hausdorff distance. For each inverse temperature β>0\beta>0, let μβf\mu_{\beta f} be the corresponding equilibrium measure. Low- and high-temperature behavior conjecture. At very low temperatures, β1\beta\gg1, a typical configuration should be an infinite collection of paths close to one another and close to the origin; at very high temperatures, 0<β10<\beta\ll1, a typical configuration for μβ\mu_{\beta} should be similar to an infinite collection of independent diffusive paths. This is a qualitative prediction for the equilibrium measures of the infinite interacting path process; the source does not provide a proof or a resolution of either asymptotic regime.

Sources & referencesView supporting material

Primary source

L. Cioletti, E. A. Silva and M. Stadlbauer, “Thermodynamic Formalism for Topological Markov Chains on Borel Standard Spaces”, arXiv:1810.03757 (2019).

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