MathSciDoc: An Archive for Mathematician ∫

We extend the exact fixed-point tensor construction of Cheng et al. to fermionic minimal models, providing an analytic construction of fixed-point tensors for fermionic rational conformal field theories. The fermionic fixed-point tensor is defined as a correlation function of boundary-changing operators on a triangle, with careful treatment of fermionic parity and spin structure. Boundary tensors are also constructed and combined with triangle tensors to form strips, enabling the extraction of scaling dimensions for boundary-changing operators. The construction incorporates modified weights for shrinkable boundary conditions, systematic depiction of spin structures, recovering both the Neveu-Schwarz and Ramond sectors. As a benchmark, our tensor with a minimal truncation of descendant levels yields convergence to the exact bulk scaling dimensions of many low energy states for the free Majorana fermion ($c=1/2$), demonstrating the efficiency of approximate fixed point tensors from boundary changing operators. We also make use of a more general description of fermionic CFTs based on fermionisation of rational bosonic CFTs, and make a generic prescription for discretisation making use of their connections to modular tensor categories. We show that the discretised spin structures on a spin surface naturally recover the signs needed to recover the R/NS sectors. We propose that the collection of OPE coefficients of the discretised 2d CFT can be naturally interpreted as a state-sum of spin-TQFTs, analogous to the bosonic case. This work provides analytically computed starting points for tensor network simulations of fermionic critical phenomena.

No keywords uploaded!