Experiments with membranes, maps and sheaves

@misc{holmes2026experiments,
  title = {{Experiments with membranes, maps and sheaves}},
  author = {Daniel Holmes and Yannik Schuler},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.03152},
  eprint = {2609.03152},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.03152},
}

TY  - UNPB
TI  - Experiments with membranes, maps and sheaves
AU  - Daniel Holmes
AU  - Yannik Schuler
PY  - 2026
DA  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2609.03152
UR  - https://arxiv.org/abs/2609.03152
AB  - Motivated by the conjectural existence of M-theory, we investigate a web of correspondences between enumerative invariants of a Calabi-Yau fivefold Z with a torus action. This includes a correspondence between the fivefold Gromov-Witten invariants and K-theoretic Pandharipande-Thomas invariants of a threefold X ⊂ Z, mediated by so-called membrane indices, which generalise Gopakumar-Vafa invariants. We establish the correspondence for strip geometries for restricted torus actions and test it numerically for general torus actions. Further numerical evidence is provided for the closed vertex, local surfaces and local projective spaces. For the latter we present conjectural formulae for their low-degree membrane indices. When the fivefold is the product of the affine plane with a suitable toric variety, we prove geometric engineering and equate the generating series of Pandharipande-Thomas invariants with the corresponding instanton partition function while equality with the Gromov-Witten series is probed numerically.
ER  -