# [Liste-CICMA] SÉMINAIRE QUÉBEC-VERMONT NUMBER THEORY (10/03/2016, Tatiana Hessami Pilehrood, Vinayak Vatsal)

Guillermo Martinez-Zalce martinez at crm.umontreal.ca
Wed Mar 9 09:28:53 EST 2016

******************************************************************

SÉMINAIRE QUÉBEC-VERMONT NUMBER THEORY

******************************************************************

DATE :
Le jeudi 10 mars 2016 / Thursday, March 10, 2016

HEURE / TIME :
10 h 30 - 12 h / 10:30 a.m. - 12:00 p.m.

CONFERENCIER(S) / SPEAKER(S) :
Tatiana Hessami Pilehrood (University of Toronto)

TITRE / TITLE :
On duality relations between multiple zeta star values and Euler sums.

LIEU / PLACE :
McGill University, Burnside Hall salle BH920

RESUME / ABSTRACT :
In recent years, there has been  intensive research on the Q-linear relations between  multiple zeta (star) values.  In this talk, we will discuss many families of identities for multiple zeta (star) values and their q-analogs. The main result is the duality relations between multiple zeta star values and Euler sums, which are  generalizations of  the Two-one formula  by Ohno and Zudilin and some multiple harmonic sum identities. Such duality relations lead  to a proof of the conjecture by Ihara et al. that the Hoffman $\star$-elements $\zeta^{\star}(s_1,\dots,s_r)$ with $s_i\in\{2,3\}$ span  the vector space generated by multiple zeta values over Q. Based on joint work with Khodabakhsh Hessami Pilehrood and Jianqiang Zhao.

******************************************************************

DATE :
Le jeudi 10 mars 2016 / Thursday, March 10, 2016

HEURE / TIME :
14 h - 15 h 30 / 2:00 p.m. - 3:30 p.m.

CONFERENCIER(S) / SPEAKER(S) :
Vinayak Vatsal (University of British Columbia)

TITRE / TITLE :

LIEU / PLACE :
Concordia University, Library Building, 9th floor, Salle/Room 921-04

RESUME / ABSTRACT :
Wadspurger has shown that the genuine automorphic cuspidal representations of the metaplectic cover S of SL_2 are divided naturally into packets, and that thse packets are indexed by the cuspidal automorphic representations of PGL_2. We construct packets of Lambda-adic modular forms of half integral weight, indexed by Lambda-adic forms on PGL_2. The elements of the Lambda-adic packets are nonzero, but they have specializations that vanish, owing to a trivial zero phenomenon and the sign of a complex root number. This is in contrast to the usual trivial zero phenomenon which arises from the vanishing of a p-adic factor.

******************************************************************
Responsable(s) :
Henri Darmon (darmon at math.mcgill.ca)
Andrew Granville (andrew at dms.umontreal.ca)
Dimitris Koukoulopoulos (koukoulo at dms.umontreal.ca)
******************************************************************

******************************************************************

http://www.dms.umontreal.ca/~qvnts/QVNTSinfo.html