Generalized Borcherds products and two number theoretic applications

Speaker: 

Ken Ono

Institution: 

University of Wisconsin

Time: 

Saturday, November 7, 2009 - 2:30pm

Location: 

RH 101

At the 1994 ICM in Zurich, Borcherds introduced the notion of an automorphic infinite product. In this lecture I will discuss joint work with Jan Bruinier which gives automorphic infinite products arising from harmonic Maass forms. We will discuss two number theoretic applications:

1) Partitions
2) Central derivatives of modular L-functions.

Genus bounds for curves with fixed Frobenius eigenvalues

Speaker: 

Everett Howe

Institution: 

CCR

Time: 

Saturday, November 7, 2009 - 11:30am

Location: 

RH 101

This talk is based on joint work with Noam Elkies and
Christophe Ritzenthaler.

Suppose you are given a finite set S of simple abelian varieties
over a finite field k. Is there a bound on the genera of the
curves over k whose Jacobians are isogenous to products
of powers of elements of S?

Serre, using results of Tsfasman and Vladuts, showed that the
answer is yes. We give explicit bounds on the genus, in terms
of the "Frobenius eigenvalues" (the roots of the characteristic
polynomials of Frobenius) of the elements of S.

We show, for example, that the maximal genus of a curve over
F_2 whose Jacobian splits completely (up to isogeny) into
a product of elliptic curves is 26 --- a bound that is
attained by a certain model of the modular curve X(11).

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