Map-counting conjecture with diagonal or degenerate intermediate fields

Let an nn-point function of diagonal and non-diagonal fields lie on a Riemann surface of genus gg. In each channel, consider conformal-bootstrap spectra containing all allowed non-diagonal fields and, whenever permitted by the fusion rules, one diagonal or degenerate field. Let Mg,n(ri)\mathcal{M}_{g,n}(r_i) denote the corresponding set of combinatorial maps, and let d0,4(δi)d_{0,4}(\delta_i) be the dimension of the four-point crossing-symmetry solution space. Map-counting conjecture with diagonal or degenerate fields. The dimension of the solution space equals Mg,n(ri)|\mathcal{M}_{g,n}(r_i)|; in particular,

d0,4(δi)=M0,4(ri).d_{0,4}(\delta_i)=\left|\mathcal{M}_{0,4}(r_i)\right|.

The text says that the conjecture is intended without non-trivial map symmetries, with stated qualifications when such symmetries occur; the supplied text does not resolve the conjecture.

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Primary source

Linnea Grans-Samuelsson, Jesper Lykke Jacobsen, Rongvoram Nivesvivat, Sylvain Ribault and Hubert Saleur, “From combinatorial maps to correlation functions in loop models”, arXiv:2302.08168 (2023).

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