On symmetrization of 6j-symbols and Levin-Wen Hamiltonian

Details On symmetrization of 6j-symbols and Levin-Wen Hamiltonian On symmetrization of 6j-symbols and Levin-Wen Hamiltonian

2009-07-13

arxiv.org/abs/0907.2204v1

Mathematics

Geometric Topology

15 pages,many figures

Scientific paper

It is known that every ribbon category with unimodality allows symmetrized $6j$-symbols with full tetrahedral symmetries while a spherical category does not in general. We give an explicit counterexample for this, namely the category $\mathcal{E}$. We define the mirror conjugate symmetry of $6j$-symbols instead and show that $6j$-symbols of any unitary spherical category can be normalized to have this property. As an application, we discuss an exactly soluble model on a honeycomb lattice. We prove that the Levin-Wen Hamiltonian is exactly soluble and hermitian on a unitary spherical category.

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