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math.NT2023★ 3 cited
Spectral Theory of Isogeny Graphs
Giulio Codogni, Guido Maria Lido
We consider finite graphs whose vertexes are supersingular elliptic curves, possibly with level structure, and edges are isogenies. They can be applied to the study of modular form…
math.AG2023
Rigidity of modular morphisms via Fujita decomposition
Giulio Codogni, Víctor González-Alonso, Sara Torelli
In this note we prove that the Torelli, Prym and Spin-Torelli morphisms, as well as covering maps between moduli stacks of projective curves can not be deformed. The proofs use pro…