Anyonic membranes and Pontryagin statistics

• URL: http://arxiv.org/abs/2509.14314v1
• Date: Wed, 17 Sep 2025 18:00:08 GMT
• Title: Anyonic membranes and Pontryagin statistics
• Authors: Yitao Feng, Hanyu Xue, Yuyang Li, Meng Cheng, Ryohei Kobayashi, Po-Shen Hsin, Yu-An Chen,
• Abstract summary: We introduce the novel anyonic statistics for membrane excitations in four dimensions.<n>In addition to the standard fermionic $mathbbZ$ membrane statistics, membranes also exhibit $mathbbZ_3$ statistics associated with Pontryagin classes.
• Score: 5.189442695283122
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Anyons, unique to two spatial dimensions, underlie extraordinary phenomena such as the fractional quantum Hall effect, but their generalization to higher dimensions has remained elusive. The topology of Eilenberg-MacLane spaces constrains the loop statistics to be only bosonic or fermionic in any dimension. In this work, we introduce the novel anyonic statistics for membrane excitations in four dimensions. Analogous to the $\mathbb{Z}_N$-particle exhibiting $\mathbb{Z}_{N\times \gcd(2,N)}$ anyonic statistics in two dimensions, we show that the $\mathbb{Z}_N$-membrane possesses $\mathbb{Z}_{N\times \gcd(3,N)}$ anyonic statistics in four dimensions. Given unitary volume operators that create membrane excitations on the boundary, we propose an explicit 56-step unitary sequence that detects the membrane statistics. We further analyze the boundary theory of $(5\!+\!1)$D 1-form $\mathbb{Z}_N$ symmetry-protected topological phases and demonstrate that their domain walls realize all possible anyonic membrane statistics. We then show that the $\mathbb{Z}_3$ subgroup persists in all higher dimensions. In addition to the standard fermionic $\mathbb{Z}_2$ membrane statistics arising from Stiefel-Whitney classes, membranes also exhibit $\mathbb{Z}_3$ statistics associated with Pontryagin classes. We explicitly verify that the 56-step process detects the nontrivial $\mathbb{Z}_3$ statistics in 5, 6, and 7 spatial dimensions. Moreover, in 7 and higher dimensions, the statistics of membrane excitations stabilize to $\mathbb{Z}_{2} \times \mathbb{Z}_{3}$, with the $\mathbb{Z}_3$ sector consistently captured by this process.

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