Existence of non-local real one-dimensional modular functors
Determine whether non-local real one-dimensional modular functors exist whose deformation-deformation cocycles represent the nontrivial cohomology classes associated with the real parts of the relevant cocycles, and thereby determine whether locality is necessary for the universality theorem.
References
There might exist non-local real one-dimensional modular functors whose deformation-deformation cocycles lie in the nontrivial cohomology classes [\Re ] and [\Re ] in $H2(\DefC; R)$. Hence, the locality in Theorem~\ref{thm:universality} might be necessary.
— Universality of the conformal anomaly
(2608.23201 - Maibach et al., 24 Aug 2026) in Remark 2.14, Section 2.3.3 (Remark \ref{remark:transnumber})