2018
Dec
03

# NT & AG - Zev Rosengarten

2:30pm to 3:30pm

## Location:

Ross 70

Title: Tamagawa Numbers of Linear Algebraic Groups III: Exotic Groups

2018
Dec
03

2:30pm to 3:30pm

Ross 70

Title: Tamagawa Numbers of Linear Algebraic Groups III: Exotic Groups

2018
Dec
10

2:30pm to 3:30pm

Ross 70

Title: Local root numbers for Heisenberg representations

Abstract: On the Langlands program, explicit computation of the local root numbers

(or epsilon factors) for Galois representations is an integral part.

But for arbitrary Galois representation of higher dimension, we do not

have explicit formula for local root numbers. In our recent work

(joint with Ernst-Wilhelm Zink) we consider Heisenberg representation

(i.e., it represents commutators by scalar matrices) of the Weil

2018
Dec
06

4:00pm to 5:00pm

Abstract: we give an overview of Gowers' proof for the existence of 4-term progression in subsets of positive density in the integers. We will discuss the tools from additive combinatorics that are used in the proof as well as some related conjectures.

2018
Nov
29

4:00pm to 5:00pm

Abstract: we give an overview of Gowers' proof for the existence of 4-term progression in subsets of positive density in the integers. We will discuss the tools from additive combinatorics that are used in the proof as well as some related conjectures.

2019
Jan
16

2019
Jan
16

11:00am to 1:00pm

Ross 63

(M. Magidor, joint work with I. Farah)

2018
Dec
03

2:30pm to 3:30pm

Ross 70

Title: Local root numbers for Heisenberg representations

Abstract:

On the Langlands program, explicit computation of the local root numbers

(or epsilon factors) for Galois representations is an integral part.

But for arbitrary Galois representation of higher dimension, we do not

have explicit formula for local root numbers. In our recent work

(joint with Ernst-Wilhelm Zink) we consider Heisenberg representation

(i.e., it represents commutators by scalar matrices) of the Weil

Abstract:

On the Langlands program, explicit computation of the local root numbers

(or epsilon factors) for Galois representations is an integral part.

But for arbitrary Galois representation of higher dimension, we do not

have explicit formula for local root numbers. In our recent work

(joint with Ernst-Wilhelm Zink) we consider Heisenberg representation

(i.e., it represents commutators by scalar matrices) of the Weil

2018
Dec
24

2:30pm to 3:30pm

Ross 70

Title: Irreducibility of Galois representations associated to low weight Siegel modular forms

Abstract: If f is a cuspidal modular eigenform of weight k>1, Ribet proved that its associated p-adic Galois representation is irreducible for all primes. More generally, it is conjectured that the p-adic Galois representations associated to cuspidal automorphic representations of GL(n) should always be irreducible.

2018
Nov
26

2018
Nov
27

2:00pm to 3:30pm

Room 209, Manchester Building, Jerusalem

Cohomology jump loci are secondary cohomological invariants of discrete groups and topological spaces. I will describe some recent work on the cohomology jump loci of complements of unions of smooth complex hypersurfaces, and I will motivate the notion of abelian duality spaces that I introduced in joint work with Alex Suciu and Sergey Yuzvinsky. The study of such hypersurface arrangements involves a mix of combinatorics and complex geometry.

2018
Nov
27

12:00pm to 1:00pm

Coffee lounge

Abstract: I will discuss two stochastic target problem in the Brownian framework .
The first problem has a nice solution which I will present. The second problem
is much more complicated and for now remains open. I will discuss the challenges and connection with other fields in probability theory.

2019
Jan
08

2:15pm to 3:15pm

Abstract: In this talk I will show that for finite entropy countable Markov shifts the entropy map is upper semi-continuous when restricted to the set of ergodic measures. This is joint work with Mike Todd and Anibal Velozo.

2018
Dec
05

2:00pm to 3:30pm

2018
Dec
12

2:00pm to 3:30pm

Ross 63

Title: Chang's Conjecture (joint with Monroe Eskew)
Abstract:
I will review some consistency results related to Chang's Conjecture (CC).
First I will discuss some classical results of deriving instances of CC from huge cardinals and the new results for getting instances of CC from supercompact cardinals, and present some open problems.
Then, I will review the consistency proof of some versions of the Global Chang's Conjecture - which is the consistency of the occurrence many instances of CC simultaneously.
We will aim to show the consistency of the statement: (\mu^+,\mu) -->> (
u^+,

2018
Nov
28

2:00pm to 3:30pm

ross 63

Title: Chang's Conjecture (joint with Monroe Eskew)
Abstract:
I will review some consistency results related to Chang's Conjecture (CC).
First I will discuss some classical results of deriving instances of CC from huge cardinals and the new results for getting instances of CC from supercompact cardinals, and present some open problems.
Then, I will review the consistency proof of some versions of the Global Chang's Conjecture - which is the consistency of the occurrence many instances of CC simultaneously.
We will aim to show the consistency of the statement: (\mu^+,\mu) -->> (
u^+,