# Seminars

Upcoming seminars can also be found here.
2019 Jun 27

# Groups and Dynamics seminar: Asaf Katz (Chicago) - An application of Margulis' inequality to effective equidistribution.

11:30am to 12:45pm

Abstract: Ratner's celebrated equidistribution theorem states that the trajectory of any point in a homogeneous space under a unipotent flow is getting equidistributed with respect to some algebraic measure. In the case where the action is horospherical, one can deduce an effective equidistribution result by mixing methods, an idea that goes back to Margulis' thesis.

2019 Jun 16

5:00pm to 6:00pm

2019 Jun 23

# Special Talk - Saharon Shelah

4:00pm to 6:00pm

## Location:

Manchester Building, Room 110

Simplicity and universality

Fixing a complete first order theory T, countable for transparency, we had known quite well for which cardinals T has a saturated model. This depends on T of course - mainly of
whether it is stable/super-stable. But the older, precursor notion of having
a universal notion lead us to more complicated answer, quite partial so far, e.g
the strict order property and even SOP_4 lead to having "few cardinals"
(a case of GCH almost holds near the cardinal). Note  that eg GCH gives a complete
2019 Jun 18

# Dynamics and probability: David Jerison (MIT) - Localization of eigenfunctions via an effective potential

2:00pm to 3:00pm

## Location:

Ross 70
We discuss joint work with Douglas Arnold, Guy David, Marcel Filoche and Svitlana Mayboroda. Consider for the operator $L = -\Delta + V$ with periodic boundary conditions, and more generally on the manifold with or without boundary. Anderson localization, a significant feature of semiconductor physics, says that the eigenfunctions of $L$ are exponentially localized with high probability for many classes of random potentials $V$. Filoche and Mayboroda introduced the function $u$ solving $Lu = 1$ and showed numerically that it strongly reflects this localization.
2019 Jun 17

# NT & AG Lunch: Michael Temkin "The explicit local and global class field theory"

1:00pm to 2:00pm

## Location:

Faculty lounge
I will finish the theory of Lubin-Tate, and start the last topic of this series -- Drinfeld's elliptic modules and CFT of function fields.
2019 Jun 30

# Minicourse: Jared Weinstein (Boston University "Geometrization of the local Langlands program"

2:00pm to 4:00pm

## Location:

Ross 70
Prof. Jared Weinstein (Boston University) will give a series of 3 talks titled "Geometrization of the local Langlands program"
2019 Jul 01

# Minicourse: Jared Weinstein (Boston University "Geometrization of the local Langlands program"

2:00pm to 4:00pm

## Location:

Ross 70
Prof. Jared Weinstein (Boston University) will give a series of 3 talks titled "Geometrization of the local Langlands program"
2019 Jun 26

# Minicourse: Jared Weinstein (Boston University "Geometrization of the local Langlands program"

2:00pm to 4:00pm

## Location:

Ross 70
Prof. Jared Weinstein (Boston University) will give a series of 3 talks titled "Geometrization of the local Langlands program"
2019 Jun 16

# Special logic seminar - Tomer Schlank

12:00pm to 2:00pm

## Location:

Sprintzak 114
Ultra products and asimpitotical phenomenon in homotopy theory
2019 Jun 27

# Basic Notions: Hillel Furstenberg (HUJI) : "Affine (Convex) representations and harmonic functions on symmetric spaces." Part 2

4:00pm to 5:15pm

## Location:

Ross 70
Classical group representation theory deals with group actions on linear spaces; we consider group actions on compact convex spaces, preserving topological and convex structure. We focus on irreducible actions, and show that for a large class of groups - including connected Lie groups - these can be determined. There is a close connection between this and the theory of bounded harmonic functions on symmetric spaces and their boundary values.
2019 Jun 20

# Basic Notions: Hillel Furstenberg (HUJI) : "Affine (Convex) representations and harmonic functions on symmetric spaces." Part 1

4:00pm to 5:15pm

## Location:

Ross 70
Classical group representation theory deals with group actions on linear spaces; we consider group actions on compact convex spaces, preserving topological and convex structure. We focus on irreducible actions, and show that for a large class of groups - including connected Lie groups - these can be determined. There is a close connection between this and the theory of bounded harmonic functions on symmetric spaces and their boundary values.
2019 Jun 12

1:20pm to 2:20pm

2019 Jun 26

# Analysis Seminar - Dvoretzky lecture - Assaf Naor "The (in)compatibility of 3 and 5 dimensional Heisenberg geometry with Lebesgue spaces"

12:00pm to 1:00pm

## Location:

Ross 70
Title: The (in)compatibility of 3 and 5 dimensional Heisenberg geometry with Lebesgue spaces Abstract: The 3-dimensional (discrete) Heisenberg geometry is the shortest-path metric on the infinite graph whose vertex set is the integer grid $\Z^3$ and the neighbors of each integer vector $(a,b,c)$ are the four integer vectors $$(a+ 1,b,c), (a- 1,b,c), (a,b+ 1,c+ a), (a,b- 1,c- a).$$
2019 Jun 12

# NO SEMINAR Basic Notions

4:00pm to 5:15pm

## Location:

Ross 70
1) Abstract of Wayne's part: Today, in our modern world, we perceive the physical universe in mathematical terms; whether degrees on longitude and latitude on earth, or in units of space-time beyond our earthly horizons. This talk will present two ancient cuneiform tablets from Babylonia which offer a geometric impression of the physical world as experienced by ancient Babylonians. Comparisons will be made with a range of other ancient mathematical, geographic, and astronomical materials from the cuneiform Ancient Near East. 2) Abstract of Mourtaza's part:
2019 Jun 02

# Logic Seminar - Javier de la Nuez Gonzalez

1:00pm to 3:00pm

## Location:

Shprinzak 29
Minimal and non-minimal automorphism groups of homogeneous structures

A Hausdorff topological group G is said minimal if G does not admit any strictly coarser Hausdorff group topology.

Examples include the isometry group of the Urysohn sphere, due to Uspenskij, and Aut(M) for M stable and w-categorical, a deep fact due to Ben Yacov and Tsankov.