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.

References

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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