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arXiv · 2506.19638

Elliptic arrangements of complex multiplication type

Luca Moci·Roberto Pagaria·Maddalena Pismataro·Alejandro Vargas
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Abstract

We provide a natural definition of an elliptic arrangement, extending the classical framework to an elliptic curve E with complex multiplication. We analyse the intersections of elements of the arrangement and their connected components as End(E)-modules. Furthermore, we prove that the combinatorial data of elliptic arrangements define both an arithmetic matroid and a matroid over the ring End(E). In this way, we obtain a class of arithmetic matroids that is different from the class of arithmetic matroids realizable via toric arrangements. Finally, we show that the Euler characteristic of the complement is an evaluation of the arithmetic Tutte polynomial.

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Luca Moci, Roberto Pagaria, Maddalena Pismataro, Alejandro Vargas. 2025-06-24. Elliptic arrangements of complex multiplication type. https://doi.org/10.1017/fms.2026.10216

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