Structural equivalence conjecture for dynamical and static Curie–Weiss Potts rate functionals

Let Δ2\Delta^2 be the unit simplex in the hyperplane HH, and let UU be an open subset of HH containing Δ2\Delta^2. Define

D={(α,β,t):β<3, t>0, αU}.D=\{(\alpha,\beta,t):\beta<3,\ t>0,\ \alpha\in U\}.

Let Gα,β,tG_{\alpha,\beta,t} denote the potential of the time-evolved model, and let fβ,αf_{\beta,\alpha} denote the potential of the static model. A smooth map ψ1\psi_1 maps DD to (0,)×Δ2(0,\infty)\times\Delta^2, and a smooth map ψ2\psi_2 maps D×Δ2D\times\Delta^2 to the static state space Δ2\Delta^2.

Structural equivalence conjecture. There exist maps ψ1\psi_1 and ψ2\psi_2 with the stated diffeomorphism properties such that, for every (α,β,t)D(\alpha,\beta,t)\in D and mΔ2m\in\Delta^2,

Gα,β,t(m)=fψ1(α,β,t)ψ2(α,β,t,m),G_{\alpha,\beta,t}(m)=f_{\psi_1(\alpha,\beta,t)}\circ\psi_2(\alpha,\beta,t,m),

and there exists a function (β,t)βst(β,t)(\beta,t)\mapsto\beta_{\mathrm{st}}(\beta,t) on (0,3)×(0,)(0,3)\times(0,\infty) satisfying

pr1ψ1(α,β,t)=βst(β,t),\operatorname{pr}_1\circ\psi_1(\alpha,\beta,t)=\beta_{\mathrm{st}}(\beta,t),

so that the effective static inverse temperature does not depend on the dynamical α\alpha.

This conjecture asserts a smooth structural equivalence between the dynamical and static rate functionals, explaining the correspondence between their phase diagrams and stationary-point structures through a parameter-dependent change of variables. Its resolution is not supplied in the source.

Sources & referencesView supporting material

Primary source

Christof Kuelske and Daniel Meissner, “Dynamical Gibbs-non-Gibbs transitions in the Curie-Weiss Potts model in the regime beta<3”, arXiv:2011.00350 (2020).

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