Workshop on

Cycles and Special Values of L-series

An activity of an i-MATH Intensive Research Programme


Booklet
 
List of participants with lodging arranged through the CRM
 
List of participants
 
Programme
   
Dates:   December 14 to 18, 2009
 
Place:   Centre de Recerca Matemàtica (CRM), Bellaterra, Barcelona, Spain          
How to reach the CRM

Goals

An interrelated web of conjectures, due, in rough chronological order, to Birch--Swinnerton-Dyer, Tate, Bloch--Beilinson, and Bloch--Kato,connects  the arithmetic properties of   algebraic cycles (taken modulo some  relation, such as  rational or algebraic equivalence) with the analytic properties of associated L-functions. 

The varieties for which we have the  most explicit information --concerning  the cycles that live on them, as well as  their l-adic cohomology groups and attendant L-functions -- are those that can be related to automorphic forms: Shimura varieties and their relatives.  

Studying these examples and exploiting their rich underlying structure has led to a fruitful interaction between arithmetic algebraic geometry and representation theory whose intensity shows no sign of abating.

The simplest case of special cycles on Shimura varieties are the CM points on modular curves; their existence is key to proving the Birch and Swinnerton-Dyer conjecture  for elliptic curves of analytic rank at most one.

Besides, the Tate conjectures have been verified in some significant higher dimensional examples involving Shimura varieties on which explicit cycles can be constructed. This is the case for instance of Hirzebruch-Zagier cycles on Hilbert modular surfaces.  

Indeed, CM points and Hirzebruch-Zagier cycles  have a host of natural  generalisations, such as special cycles on Shimura varieties of orthogonal or unitary type. In spite of  intense effort that have been deployed  in pursuing these generalisations,  and the impressive results that have been obtained to date, it can be said that their arithmetic study is still in its infancy and presents many exciting opportunities.

The one-week workshop that we plan to hold in this subject will focus on the following topics:

-- Arithmetic of modular and Shimura curves, and CM points;  

-- Special cycles on Shimura varieties of orthogonal and unitary type; relations with singular theta lifts and the Borcherds lift.

-- Beilinson-Kato elements, and other Euler systems.

-- Heights of special cycles, and Arakelov theory.

-- p-adic analogues and their connection with Iwasawa theory and p-adic families of modular forms. 

-- Special topological cycles, such as ATR cycles, and their connections with the Stark Conjectures and explicit class field theory.

Scientific Committee

Confirmed Speakers

Registration

Fee: 60 Euros, including participation to the lectures, documentation package, lunch tickets, and coffee breaks.

Deadline for registration and payment: November 15, 2009

Registration (closed): word file - pdf file
Payment: word file - pdf file

For registration and payment fill out the documents above and follow the instructions there

Accommodation

Participants are encouraged to book their lodging as soon as possible.