Absolute continuity of near-critical 3-Potts and 4-Potts FK scaling limits

Consider FK percolation for the 3-state and 4-state Potts models, with inverse temperatures βq=3\beta^{q=3} and βq=4\beta^{q=4} satisfying

βq=3=βcq=3+λn6/5,βq=4=βcq=4+λn3/2.\beta^{q=3}=\beta_c^{q=3}+\frac{\lambda}{n^{6/5}},\qquad \beta^{q=4}=\beta_c^{q=4}+\frac{\lambda}{n^{3/2}}.

These shifts correspond to the expected correlation exponents ν=5/6\nu=5/6 for q=3q=3 and ν=2/3\nu=2/3 for q=4q=4. Potts absolute-continuity conjecture. FK percolation for 3-Potts and 4-Potts has near-critical scaling limits under these temperature shifts, and, under for example the quad topology (H,dH)(\mathcal{H},d_{\mathcal{H}}), these near-critical scaling limits are absolutely continuous with respect to the critical scaling limits. The critical scaling limits are not known to be unique, so the conjecture includes a statement about absolute continuity relative to whichever critical limits exist.

Sources & referencesView supporting material

Primary source

Christophe Garban and Antti Kupiainen, “Energy field of critical Ising model and examples of singular fields in QFT”, arXiv:2502.02554 (2025).

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