A characterization of integral elliptic automorphic forms
A condition for the rationality of certain elliptic modular forms over primes dividing the level
Let be a weight holomorphic automorphic form with respect to . We prove a sufficient condition for the integrality of over primes dividing . This condition is expressed in terms of the values at particular curves of the forms obtained by iterated application of the weight Maaß operator to and extends previous results of the Author.
A dimension formula for Ekedahl-Oort strata
We study the Ekedahl-Oort stratification on moduli spaces of PEL type. The strata are indexed by the classes in a Weyl group modulo a subgroup, and each class has a distinguished representative of minimal length. The main result of this paper is that the dimension of a stratum equals the length of the corresponding Weyl group element. We also discuss some explicit examples.
A moduli approach to quadratic -curves realizing projective mod Galois representations.
A note on a paper of Franklin
A proof of quintic reciprocity using the arithmetic of y² = x⁵ + 1/4
A survey of computational class field theory
We give a survey of computational class field theory. We first explain how to compute ray class groups and discriminants of the corresponding ray class fields. We then explain the three main methods in use for computing an equation for the class fields themselves: Kummer theory, Stark units and complex multiplication. Using these techniques we can construct many new number fields, including fields of very small root discriminant.
An alternative description of the Drinfeld -adic half-plane
We show that the Deligne formal model of the Drinfeld -adic half-plane relative to a local field represents a moduli problem of polarized -modules with an action of the ring of integers in a quadratic extension of . The proof proceeds by establishing a comparison isomorphism with the Drinfeld moduli problem. This isomorphism reflects the accidental isomorphism of and for a two-dimensional split hermitian space for .
An effective bound of p for algebraic points on Shimura curves of Γ₀(p)-type
In previous articles, we showed that for number fields in a certain large class, there are at most elliptic points on a Shimura curve of Γ₀(p)-type for every sufficiently large prime number p. In this article, we obtain an effective bound for such p.
An integrality criterion for elliptic modular forms
Let be an elliptic modular form level of N. We present a criterion for the integrality of at primes not dividing N. The result is in terms of the values at CM points of the forms obtained applying to the iterates of the Maaß differential operators.
Anticyclotomic Iwasawa theory of CM elliptic curves
We study the Iwasawa theory of a CM elliptic curve in the anticyclotomic -extension of the CM field, where is a prime of good, ordinary reduction for . When the complex -function of vanishes to even order, Rubin’s proof of the two variable main conjecture of Iwasawa theory implies that the Pontryagin dual of the -power Selmer group over the anticyclotomic extension is a torsion Iwasawa module. When the order of vanishing is odd, work of Greenberg show that it is not a torsion module. In...
Anticyclotomic main conjectures.
Arithmetic on elliptic curves with complex multiplication. II.
Automorphism groups of Shimura varieties.