Duality defects in $D_n$-type Niemeier lattice CFTs

Understand

We discuss the construction of duality defects in $c=24$ meromorphic CFTs that correspond to Niemeier lattices.

• We will illustrate our constructions for the $D_n$-type lattices.
• We will identify non-anomalous $\mathbb{Z}_2$ symmetries of these theories, and we show that on orbifolding with respect to these symmetries, these theories map to each other.
• We investigate this map, and in the case of self-dual orbifolds, we provide the duality defect partition functions.