Understanding Non-Split 2-Group Symmetry: (3+1)D SymTFT, Anomaly and Bordism

Zhenbang Gu, Ran Luo, Yi-Nan Wang +1

We present a systematic study of finite, non-split 2-group symmetries with a non-trivial Postnikov class, focusing on the simplest example with a ${\mathbb{Z}}_2$ 0-form symmetry and…