Dynamics Lunch

The Dynamics Lunch seminar meets regularly on Tuesdays at 12:00 at the lobby of the Manchester building. Speakers talk not about their own work, but rather about some interesting paper they read (can be classical or new), that they think might be interesting to a broad dynamical audience (many times it is attended also by people from combinatorics/analysis/group theory). Meanwhile all attendants eat fruit and sandwiches.

2019 Mar 26

Dynamics lunch: Lauritz Streck "A rigidity sequence construction on the circle"

12:00pm to 1:00pm

Location:

Manchester faculty club
2019 Mar 19

Dynamics lunch: Jing Zhou

12:00pm to 1:00pm

Location:

Manchester faculty club
2019 Apr 30

Dynamics Lunch: Nishant Chandgotia

12:00pm to 1:00pm

2019 Jan 01

Dynamics Lunch: Zemer Kosloff: On the action of the permutation group on the cantor set (after Aldous-Pitman and Stratila-Voiculescu)

12:00pm to 1:00pm

2018 Nov 27

Dynamics Seminar: Yan Dolinsky

12:00pm to 1:00pm

Location:

Manchester faculty club
2018 Nov 20

Dynamics Lunch: Jiange Li "Sumsets and entropy" after Ruzsa

12:00pm to 1:00pm

Location:

Manchester faculty club
2019 Jan 08

Dynamics Lunch: Nachi Avraham Re'em: "Sethuraman-Varadhan's Proof of the Central Limit Theorem for Non-Homogeneous Markov Chains"

12:00pm to 1:00pm

2018 Dec 18

Dynamics Lunch: Omer Ben-Neria "Dichotomies for Borel equivalence relations"

12:00pm to 1:00pm

Abstract: We would like present several results in descriptive set theory involving definable equivalence relations on Polish spaces. Given an equivalence relation E on a polish space X, we would like to study the classification problem of determining whether two objects x,y in X are E-related.
2018 Dec 04

Dynamics Lunch: Manuel Luethi "Well approximable numbers and times n invariant probability measures on the torus after Einsiedler, Fishman and Shapira."

12:00pm to 1:00pm

Location:

Manchester faculty club
2018 Nov 13

Dynamics Lunch: Jakub Konieczny "Sarnak conjecture and automatic sequences (following C. Müllner and M. Lemańczyk)"

12:00pm to 1:00pm

Location:

Manchester faculty club
2018 Dec 11

Dynamics Lunch: Tom Gilat "A proof of the Erdos-Kac theorem by A. Granville and K. Soundararjan"

12:00pm to 1:00pm

Location:

Manchester faculty club
2018 Nov 06

Dynamics Lunch: Weikun He "Counterexamples to a conjecture of Woods, after Regev, Shapira and Weiss."

12:00pm to 1:00pm

Location:

Manchester faculty club
2019 Jan 15

Dynamics Lunch: Tsviqa Lakrec "Recurrence properties of random walks on ﬁnite volume homogeneous manifold"

12:00pm to 1:00pm

2018 Oct 23

Dynamics Lunch: Amir Algom "On \alpha \beta sets."

12:00pm to 1:00pm

Location:

Manchester faculty club
Let $\alpha, \beta$ be elements of infinite order in the circle group. A closed set K in the circle is called an \alpha \beta set if for every x\in K either x+\alpha \in K or x+\beta \in K. In 1979 Katznelson proved that there exist non-dense \alpha \beta sets, and that there exist \alpha \beta sets of arbitrarily small Hausdorff dimension. We shall discuss this result, and a more recent result of Feng and Xiong, showing that the lower box dimension of every \alpha \beta set is at least 1/2.
2018 Jun 26

Dynamics Lunch: Jasmin Matz (Huji) ״Distribution of periodic orbits of the horocycle flow״

12:00pm to 1:00pm

Location:

Manchester lounge
An old result of Hedlund tells us that there are no closed orbits for the horocycle flow on a compact Riemann surface M. The situation is different if M is non-compact in which case there is a one-parameter family of periodic orbits for every cusp of M. I want to talk about a result by Sarnak concerning the distribution of the such orbits in each of these families when their length goes to infinity. It turns out that these orbits become equidistributed in M and the rate of convergence can in fact be quantified in terms of spectral properties of the Eisenstein series on M.