2017
Nov
21

# Eventss

2018
Jan
04

# Basic Notions Seminar: Zlil Sela (HUJI) - "Projection complexes, actions on quasi-trees, and applications to mapping class groups of surfaces" (after Bestvina-Bromberg-Fujiwara).

4:00pm to 5:15pm

## Location:

Ross 70

Projection complexes, actions on quasi-trees, and applications to mapping class groups of surfaces (after Bestvina-Bromberg-Fujiwara).

2017
Mar
02

# Basic Notions: Ori Gurel Gurevich (HUJI) - On Smirnov's proof of conformal invariance of critical percolation

4:00pm to 5:00pm

## Location:

Manchester Building, Lecture Hall 2

Abstract:

Let G be an infinite connected graph. For each vertex of G we decide

randomly and independently: with probability p we paint it blue and

with probability 1-p we paint it yellow. Now, consider the subgraph of

blue vertices: does it contain an infinite connected component?

There is a critical probability p_c(G), such that if p>p_c then almost

surely there is a blue infinite connected component and if p

We will focus on planar graphs, specifically on the triangular

Let G be an infinite connected graph. For each vertex of G we decide

randomly and independently: with probability p we paint it blue and

with probability 1-p we paint it yellow. Now, consider the subgraph of

blue vertices: does it contain an infinite connected component?

There is a critical probability p_c(G), such that if p>p_c then almost

surely there is a blue infinite connected component and if p

__p_c or p<p_c.__We will focus on planar graphs, specifically on the triangular

2018
Jan
11

# Basic Notions: Michael Hopkins (Harvard) - Homotopy theory and algebraic vector bundles

4:00pm to 5:15pm

## Location:

Einstein 2

Abstract: This talk will describe joint work with Aravind Asok

and Jean Fasel using the methods of homotopy theory to construct new

examples of

algebraic vector bundles. I will describe a natural conjecture

which, if

true, implies that over the complex numbers the classification

of algebraic

vector bundles over smooth affine varieties admitting an

algebraic cell

decomposition coincides with the classification of topological

complex vector bundles.

and Jean Fasel using the methods of homotopy theory to construct new

examples of

algebraic vector bundles. I will describe a natural conjecture

which, if

true, implies that over the complex numbers the classification

of algebraic

vector bundles over smooth affine varieties admitting an

algebraic cell

decomposition coincides with the classification of topological

complex vector bundles.

2017
Apr
27

# Basic notions: Raz Kupferman

4:00pm to 5:15pm

Abstract:

The “geometrization" of mechanics (whether classical, relativistic or quantum) is almost as old as modern differential geometry, and it nowadays textbook material.

The “geometrization" of mechanics (whether classical, relativistic or quantum) is almost as old as modern differential geometry, and it nowadays textbook material.

2018
Jan
14

# Kazhdan Sunday seminars: Tomer Schlank (HUJI) "Topics in algebraic topology".

11:00am to 1:00pm

## Location:

Ross buildings, Room 70A.

10:00-11:00 We will have a special lecture on string diagrams by Shaul Barkan
11:00-13:00 Asaf Horev will continue his talk about ambidexterity and duality

2018
Jan
14

# Kazhdan Sunday seminars: Leonid Polterovich (TAU) "Algebraic methods in symplectic topology"

3:00pm to 5:00pm

## Location:

Ross buildings, Room 70A.

Nick Rozenblyum (Chicago) will talk about Tamarkin's category.

2017
Oct
22

(All day)

2017
Nov
15

# Jerusalem Analysis Seminar: "Operators and random walks", Gady Kozma (Weizmann Institute)

12:00pm to 1:00pm

## Location:

Ross 70 (NOTE LOCATION!)

Abstract: We will discuss the question: for a random walk in a random environment, when should one expect a central limit theorem, i.e. that after appropriate scaling, the random walk converges to Brownian motion? The answer will turn out to involve the spectral theory of unbounded operators. All notions will be defined in the talk. Joint work with Balint Toth.

2017
Mar
09

# Analysis and PDEs: Iosif Polterovich (Montreal) - Nodal Geometry of Steklov Eigenfunctions

12:00pm to 1:00pm

## Location:

Ross 70

I will present an overview of some recent progress on the study of the nodal sets of Steklov eigenfunctions. In particular, I will discuss sharp estimates on the nodal length of Steklov eigenfunctions on real-analytic Riemannian surfaces with boundary obtained in my joint

work with D. Sher and J. Toth.

work with D. Sher and J. Toth.

2017
May
18

# Mark Rudelson: Delocalization of the eigenvectors of random matrices.

1:00pm to 2:00pm

## Location:

Ross 70

Abstract: Consider a random matrix with i.i.d. normal entries. Since its distribution is invariant under rotations, any normalized eigenvector is uniformly distributed over the unit sphere. For a general distribution of the entries, this is no longer true. Yet, if the size of the matrix is large, the eigenvectors are distributed approximately uniformly. This property, called delocalization, can be quantified in various senses. In these lectures, we will discuss recent results on delocalization for general random matrices.

2016
Mar
31

# PDE & Analysis: Mark Ruselson (UMichigan) - No-gaps delocalization for general random matrices.

1:00pm to 2:30pm

## Location:

Ross 70

Title: No-gaps delocalization for general random matrices.

Abstract:

Abstract:

2017
Dec
20

# Jerusalem Analysis Seminar: "Translation invariant probability measures on the space of entire functions." Adi Glucksam

12:00pm to 1:00pm

## Location:

Ross 70

20 years ago Weiss constructed a collection of non-trivial translation invariant probability measures on the space of entire functions using tools from dynamical systems. In this talk, we will present another elementary construction of such a measure, and give upper and lower bounds for the possible growth of entire functions in the support of such measures.

2016
Dec
22

# Analysis and PDE's Seminar -- Percy Deift (Courant)

1:00pm to 2:00pm

## Location:

Ross 70

On the Asymptotic behavior of a log gas in the bulk scaling limit in the presence of a varying external potential.

T.Bothner, P.Deift, A.Its and I.Krasovsky

Abstract: We study the partition function Z of a Coulomb gas of particles with an external potential 2v applied to the

particles in an interval of length L. When v is infinite, Z describes the gap probability for GUE eigenvalues in the bulk scaling limit,

and has been well-studied for many years. Here we study the the behavior of Z in the full (v,L) plane.

T.Bothner, P.Deift, A.Its and I.Krasovsky

Abstract: We study the partition function Z of a Coulomb gas of particles with an external potential 2v applied to the

particles in an interval of length L. When v is infinite, Z describes the gap probability for GUE eigenvalues in the bulk scaling limit,

and has been well-studied for many years. Here we study the the behavior of Z in the full (v,L) plane.

2017
May
17

# Mark Rudelson: Delocalization of the eigenvectors of random matrices.

2:00pm to 3:00pm

## Location:

רוס 63

Abstract: Consider a random matrix with i.i.d. normal entries. Since its distribution is invariant under rotations, any normalized eigenvector is uniformly distributed over the unit sphere. For a general distribution of the entries, this is no longer true. Yet, if the size of the matrix is large, the eigenvectors are distributed approximately uniformly. This property, called delocalization, can be quantified in various senses. In these lectures, we will discuss recent results on delocalization for general random matrices.