Abstract

We study the relations between Poncelet 5-gons, abelian surfaces with real multiplication and the Hilbert modular surfaceY(5) for the number field\(\mathbb{Q}\left( {\sqrt 5 } \right)\). These objects are linked by the construction of Kummer surfaces as double convers of the projective plane. Constructing a map from the moduli space of Poncelet 5-gons toY(5), we get a new proof for the rationality ofY(5). As a corollary we get a theorem of plane projective geometry (due to Humbert) describing the combinatorial symmetries of Poncelet pairs of conics with a Poncelet 5-gon and a bitangent.

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