Multilinear hyperquiver representations

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• Tommi Muller (University of Oxford)
• Thursday 18 January 2024, 14:30-15:15
• Seminar Room 2, Newton Institute.

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EMG - New equivariant methods in algebraic and differential geometry

We count singular vector tuples of a system of tensors assigned to the edges of a directed hypergraph. To do so, we study the generalisation of quivers to directed hypergraphs. Assigning vector spaces to the nodes of a hypergraph and multilinear maps to its hyperedges gives a hyperquiver representation. Hyperquiver representations generalise quiver representations (where all hyperedges are edges) and tensors (where there is only one multilinear map). The singular vectors of a hyperquiver representation are a compatible assignment of vectors to the nodes. We compute the dimension and degree of the variety of singular vectors of a sufficiently generic hyperquiver representation. Our formula specialises to known results that count the singular vectors and eigenvectors of a generic tensor.

This talk is part of the Isaac Newton Institute Seminar Series series.

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