# Calendar

Jan
9
Mon
First Day of Instruction
Jan 9 all-day
Feb
2
Thu
Number Theory Seminar – Jim Brown @ Keller 301
Feb 2 @ 4:30 pm – 5:30 pm
Title:  Klingen Eisenstein series and symmetric square $L$-functions
Abstract: It is well-known in number theory that some of the deepest results come in connecting complex analysis in the form of $L$-functions with algebra/geometry in the form of Galois representations/motives. In this talk we will consider this for a particular case. Let $f$ be a newform of weight $k$ and full level. Associated to $f$ one has the adjoint Galois representation and the symmetric square $L$-function. The Bloch-Kato conjecture predicts a precise relationship between special values of the symmetric square $L$-function of $f$ with size of the Selmer groups of twists of the adjoint Galois representation. We will outline a result providing evidence for this conjecture by lifting $f$ to a Klingen Eisenstein series and producing a congruence between the Klingen Eisenstein series and a Siegel cusp form with irreducible Galois representation. time permitting, we will discuss a modularity result for a 4-dimensional Galois representation that arises from the congruence and studying a particular universal deformation ring.  This is joint work with Kris Klosin.

May
3
Wed
Last day of instruction
May 3 all-day