2017
Dec
26

# Events & Seminars

2015
Dec
08

# Dynamics lunch: Elchanan Mossel (UPenn): What do physicists mean when they talk about replica symmetry breaking - some ideas from the proof of the k satisfiability threshold conjecture.

12:00pm to 1:00pm

## Location:

Manchester building, Hebrew University of Jerusalem, (Coffee lounge)

2018
Jan
16

2016
Nov
15

# Dynamics lunch: Mike Hochman (HUJI)

12:00pm to 1:00pm

2018
Jan
23

# Dynamics Lunch: Naomi Feldheim (Weizmann) "How to compute the expected number of zeroes of a random function"

12:00pm to 1:00pm

## Location:

Manchester building lobby

This talk is devoted to the "Kac-Rice formula", which is an explicit way to compute

the expected number of zeroes of a random series with independent Gaussian coefficients.

We will discuss the original proofs of Kac and Rice (1940's),

an elegant geometrical proof due to Edelman and Kostlan (1995), some interesting examples,

and extensions to complex zeroes and eigenvalues of random matrices.

2017
Nov
14

2017
Nov
07

2017
Nov
28

# Dynamics lunch: Benjy Weiss "Rigidity sequences for weakly mixing transformations"

12:00pm to 1:00pm

Here is a title and abstract for the lunch seminar:

Rigidity sequences for weakly mixing transformations

Abstract: I will present a recent result of Bassam Fayad

and Jean-Paul Thouvenot that shows that any rigidty

sequence for an irrational rotation is also a rigidity

sequence for some weakly mixing transformation.

Rigidity sequences for weakly mixing transformations

Abstract: I will present a recent result of Bassam Fayad

and Jean-Paul Thouvenot that shows that any rigidty

sequence for an irrational rotation is also a rigidity

sequence for some weakly mixing transformation.

2015
Nov
10

# Dynamics lunch: Lei Yang (HUJI) "Proper affine actions and geodesic flows of hyperbolic surfaces"

12:00pm to 1:00pm

## Location:

Manchester building, Hebrew University of Jerusalem, (Coffee Lounge)

Title: Proper affine actions and geodesic flows of hyperbolic surfaces

2018
Jan
09

# Dynamics Lunch: Raimundo Briceno (TAU) "A Breiman type theorem for Gibbs measures"

12:00pm to 1:00pm

We will review a Breiman type theorem for Gibbs measures due to Gurevich and Tempelman. For a translation invariant Gibbs measure on a suitable translation invariant configuration set X \subset S^G, where G is an amenable group and S is a finite set, we will prove the convergence of the Shannon-McMillan-Breiman ratio on a specific subset of "generic" configurations. Provided that the above Gibbs measure exists, we also prove the convergence in the definition of pressure and the fact that this Gibbs measure is an equilibrium state.

2015
Dec
15

2018
Jan
02

# Dynamics Lunch: Ohad Feldheim (HUJI) "Finitely dependent proper colouring of Z"

12:00pm to 1:00pm

An M-dependent process X(n) on the integers, is a process for which every event concerning with X(-1),X(-2),... is independent from every event concerning with X(M),X(M+1),...

Such processes play an important role both as scaling limits of physical systems and as a tool in approximating other processes.

A question that has risen independently in several contexts is:

"is there an M dependent proper colouring of the integer lattice for some finite M?"

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
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