Clifford BMW Categories and Conformal Embeddings of Types B C and D

Abstract

In this paper, we give diagrammatic descriptions of the quantum subgroups coming from conformal embeddings of the form $\mathcal{V}(\mathfrak{g}), \check{h}) \subset \mathcal{V}(\mathfrak{so}_{\dim \mathfrak{g}}, 1)$ for $\mathfrak{g}\in \left\{\mathfrak{so}_N, \mathfrak{sp}_{2N}\right\}$, as well as the conformal embeddings of the form $\mathcal{V}(\mathfrak{sp}_{2r + 2}, 2r) \subset \mathcal{C}(\mathfrak{so}_{\dim \mathfrak{sp}_{2r + 2}}, 1)$, extending the techniques of Edie-Michell and Snyder which applied to conformal embeddings of the form $\mathcal{V}(\mathfrak{sl}_r, r) \subset \mathcal{V}(\mathfrak{so}_{\dim \mathfrak{sl}_r}, 1)$. Our main conceptual innovation is the use of fermion condensation to construct a continuous family of planar superalgebras, which we call the Clifford BMW supercategories. The tower of endomorphism algebras, $CW_n(σ, ε)$ is a combination of Birman Wenzl Murakami algebras and Clifford algebras, much in the spirit of the Hecke Clifford algebras. This tower of algebras appears to be new, and already yields some exciting combinatorics.