Complex coordinates forced by finite orthogonality hypergraphs in dimension three

Abstract:We exhibit two finite orthogonality hypergraphs that admit faithful orthogonal representations by rays in complex three-dimensional space but admit none in real three-dimensional space. Thus, although each orthogonality diagram is unchanged, its coordinatizability in dimension three depends on whether the scalar field is complex or real. The first hypergraph has 20 vertices and 12 contexts. The second hypergraph adds one vertex and two contexts. Phase-adjusted realification also gives explicit faithful orthogonal representations of both hypergraphs in real six-dimensional space.

Combinatorics (math.CO); Quantum Physics (quant-ph)

arXiv:2609.20205 [math.CO]

(or arXiv:2609.20205v1 [math.CO] for this version)

https://doi.org/10.48550/arXiv.2609.20205 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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