Past seminars:
Fall 2006,
Spring 2007
Fall 2007,
Spring 2008
Fall 2008,
Spring 2009
Fall 2009,
Spring 2010
Fall 2010,
Spring 2011
Fall 2011,
Spring 2012
Fall 2012,
Spring 2013
Fall 2013,
Spring 2014
Fall 2014,
Spring 2015
Fall 2015,
Spring 2016

Fall 2016:

Sep 2: No seminar


Sep 16: Maciej Capinski (AGH University of Science and Technology, Krakow, Poland)
Beyond the Melnikov Method: A Computer Assisted Approach
We present a Melnikov type approach for establishing transversal intersections of stable/unstable manifolds of perturbed normally hyperbolic invariant manifolds. In our approach, we do not need to know the explicit formulas for the homoclinic orbits prior to the perturbation. We also do not need to compute any integrals along such homoclinics. All needed bounds are established using rigorous computer assisted numerics. Lastly, and most importantly, the method establishes intersections for an explicit range of parameters, and not only for perturbations that are ‘small enough,’ as is the case in the classical Melnikov approach.

Sep 23: David Aulicino (Brooklyn College of CUNY)
Weak Mixing for Translation Surfaces with Intermediate Orbit Closures
Work of Avila and Forni established weak mixing for the generic straight line flow on generic translation surfaces, and the work of Avila and Delecroix determined when weak mixing occurs for the straight line flow on a Veech surface. Following the work of Eskin, Mirzakhani, Mohammadi, which proved that the orbit closure of every translation surface has a very nice structure, one can ask how the orbit closure affects the weak mixing of the straight line flow. In this talk all of the necessary background on translation surfaces and weak mixing will be presented followed by the answer to this question. This is a joint work in progress with Artur Avila and Vincent Delecroix.

Sep 30:

Oct 7:

Oct 14: No seminar

Oct 21: Mark Bell (University of Illinois at UrbanaChampaign)
Slowly Converging PseudoAnosovs
A classical property of pseudoAnosov mapping classes is that
they act on the space of projective measured laminations with
northsouth dynamics. This means that under iteration of such a mapping
class, laminations converge exponentially quickly towards its stable
lamination. We will discuss a new construction (joint with Saul
Schleimer) of pseudoAnosovs where this exponential convergence has base
arbitrarily close to one and so is arbitrarily slow.

Oct 28:
