Involutions, Humbert surfaces, and divisors on a moduli space
Involutions, Humbert surfaces, and divisors on a moduli space
Let \mathfrak M^*_2 be the Igusa compactification of the Siegel modular variety of degree 2 and level 2. In earlier work with R. Lee, we carefully investigated this variety. Subvarieties D_ℓ (compactification divisors) and H_Δ (Humbert surface of discriminant 1) play a prominent role in its structure; in particular their …