Quasi-geometricity conjecture for connections from braided fusion categories

Let C\mathcal C be a braided fusion category over C\Bbb C. For objects X1,,Xn,YCX_1,\ldots,X_n,Y\in\mathcal C, the space Hom(Y,X1Xn)\operatorname{Hom}(Y,X_1\otimes\cdots\otimes X_n) carries an action of the pure braid group PBnPB_n, defining a Betti local system LX1,,Xn,Y\mathcal L_{X_1,\ldots,X_n,Y} on the configuration space

Xn=Cn{diagonals}.X_n=\Bbb C^n\setminus\{\text{diagonals}\}.

Let X1,,Xn,Y\nabla_{X_1,\ldots,X_n,Y} be the unique, up to isomorphism, regular-singular flat connection on XnX_n whose monodromy is this local system. A connection is quasi-geometric when it is defined over Q\overline{\Bbb Q} in both its de Rham and Betti realizations. Quasi-geometricity conjecture. The connection X1,,Xn,Y\nabla_{X_1,\ldots,X_n,Y} is defined over Q\overline{\Bbb Q}; equivalently, it is a quasi-geometric connection. The source notes that braided fusion categories are defined over Q\overline{\Bbb Q} by Ocneanu rigidity, while the conjectural assertion concerns the resulting Riemann-Hilbert connections.

Sources & referencesView supporting material

Primary source

Pavel Etingof and Alexander Varchenko, “Periodic and quasi-motivic pencils of flat connections”, arXiv:2401.00636 (2024).

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