Multipartite Entanglement Geometry in AdS/BCFT

@misc{basu2026multipartite,
  title = {{Multipartite Entanglement Geometry in AdS/BCFT}},
  author = {Debarshi Basu and Qiang Wen and Mingshuai Xu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.11921},
  eprint = {2610.11921},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.11921},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Multipartite Entanglement Geometry in AdS/BCFT
AU  - Debarshi Basu
AU  - Qiang Wen
AU  - Mingshuai Xu
PY  - 2026
DA  - 2026/10/17
PB  - arXiv
DO  - 10.48550/arxiv.2610.11921
UR  - https://arxiv.org/abs/2610.11921
AB  - Multipartite entanglement measures probe how quantum correlations are organized beyond what can be inferred from pairwise entropies. We study how this structure is reshaped by a physical boundary in a holographic BCFT. The end-of-the-world brane opens new relative-homology channels for multipartite entanglement, allowing connected bulk webs to reorganize and factorize at scales that need not coincide with any ordinary Ryu--Takayanagi transition. In static AdS_3/BCFT_2, this produces a characteristic hierarchy of multipartite phases and a nontrivial dependence of genuine multi-entropy on the boundary. In the thermofield-double state, genuinely connected webs can instead be supported through the Einstein--Rosen bridge, leading to growth, reconnection and saturation scales distinct from the usual Hartman--Maldacena transitions. These results show that multipartite entanglement is sensitive not only to extremal-surface areas but also to how bulk entanglement structures are allowed to join, split and terminate in the presence of a boundary.
ER  -