The compactness and deformation-dimension conjecture for CFT moduli

Fix c00c_0\geq 0 and Emin>0E_{\min}>0, and let Mcc0Emin{\cal M}_{c\leq c_0}^{E_{\min}} be the moduli space of irreducible conformal field theories with central charge cc0c\leq c_0 and

min{p+q>0Hp,q0}Emin.\min\{p+q>0\mid H^{p,q}\neq 0\}\geq E_{\min}.

For a given CFT, its minimal versal deformation is a deformation with the smallest possible base. Compactness and deformation-dimension conjecture. Mcc0Emin{\cal M}_{c\leq c_0}^{E_{\min}} is a compact real analytic stack of finite local dimension, and the dimension of the base of the minimal versal deformation of any given CFT is at most dimH1,1\dim H^{1,1}. This conjecture proposes compactness of bounded-energy CFT moduli and a uniform local deformation bound; the source gives no resolution or evidence of a proof.

Sources & referencesView supporting material

Primary source

Yan Soibelman, “Moduli space of Conformal Field Theories and non-commutative Riemannian geometry”, arXiv:2506.00896 (2025).

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