The strict inequality conjecture for the polymer moment threshold

Let p(β)p^*(\beta) denote the critical moment threshold for the directed polymer model, and let dd be the spatial dimension. The weak-disorder critical inverse temperature is denoted by βcr\beta_{cr}.

Strict inequality conjecture. There exists no βR+\beta\in\mathbb R_+ such that

p(β)=1+2/d.p^*(\beta)=1+2/d.

This is a reformulation of the widely held conjecture that the strong-disorder criterion holds at βcr\beta_{cr}. If true, it implies that p(β)>1+2/dp^*(\beta)>1+2/d throughout the weak-disorder phase.

Sources & referencesView supporting material

Primary source

Stefan Junk, “Local limit theorem for directed polymers beyond the L^2-phase”, arXiv:2307.05097 (2025).

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