Infosheet (January 24th, 2017)

Queen's University - Department of Mathematics and Statistics


Tuesday, January 24

Seminar in Free Probability and Random Matrices

Time: 2:30 p.m.

Place: Jeffery 222

Speaker: Jamie Mingo, Queen’s University

Title: Free Probability of Type B, Part II

Abstract Attached

Tuesday, January 24

Dynamics Seminar

Time: 3:30 p.m.

Place: Jeffery 422

Speaker: Andrey Gogolev, Binghamton University

Title: Classification in hyperbolic dynamics

Abstract Attached

Wednesday, January 25

Curves Seminar

Time: 3:30 p.m.

Place: Jeffery 422

Speaker: Mike Roth

Title: Quotients of affine varieties by reductive groups II

Abstract Attached

Thursday, January 26

Math Club

Time: 5:30 p.m.

Place: Jeffery 118

Speaker: Mike Roth

Title: Permuations given by polynomials

Abstract Attached

Friday, January 27

Number Theory Seminar

Time: 10:30 a.m.

Place: Jeffery 422

Speaker: Vaidehee Thatte, Queen’s University

Title: Some examples of Artin-Schreier Extensions of Valuation Fields (“No Theory – II”)

Abstract Attached

Friday, January 27

Department Colloquium

Time: 3:30 p.m.

Place: Jeffery 234

Speaker: Todd Parsons, Université Pierre et Marie Curie

Title: The stochastic evolution of pathogen virulence

Abstract Attached

Items for the Info Sheet should reach Anne ( burnsa@queensu.ca) by noon on Monday. The Info Sheet is published every Tuesday.


Tuesday, January 24, 2:30 p.m. Jeffery 222

Seminar in Free Probability and Random Matrices

Speaker: Jamie Mingo

Title: Free Probability of Type B, Part II

Abstract: Since Voiculescu introduced free independence 35 years ago, many variants have appeared: Boolean, monotone, type B, second order, higher order, real, quaternionic, infinitesimal, and bi-free independence (plus combinations of the above) to name a few. Most of the constructions are given combinatorially, but some have an interpretation in terms of analytic functions. I will discuss the 2003 paper of Biane, Goodman, and Nica, which introduced freeness of type B.

This will be the first of two lectures. This lecture will describe free cumulants of type B and type B freeness. The second lecture will explain how the hyperoctahedral group comes into play and hence why this is called type B freeness.

Seminar website: http://www.mast.queensu.ca/~mingo/seminar/


Tuesday, January 24, 3:30 p.m. Jeffery 422 - Dynamics Seminar

Speaker: Andrey Gogolev

Title: Classification in hyperbolic dynamics

Abstract: Impossibility to predict the future based on current (no matter how precise) observation of a dynamical system is known as deterministic chaos. Hyperbolicity is the geometric mechanism behind deterministic chaos and is observed in many real-life dynamical systems such as double pendulum and atmospheric convection.

We will overview the status of the classification problem of uniformly hyperbolic diffeomorphisms, which are ideal models for hyperbolicity. Then we will focus on a more general class of partially

hyperbolic diffeomorphisms. Partial hyperbolicity plays an important role in smooth dynamics due to its

ties to stable ergodicity and robust transitivity. We will discuss recent progress on classification questions in partially hyperbolic dynamics.


Wednesday, January 25, 3:30 p.m. Jeffery 422 - Curves Seminar

Speaker: Mike Roth

Title: Quotients of affine varieties by reductive groups II

Abstract: We will prove the basic results about the quotient of an affine variety by the action of a reductive group.


Thursday, January 26, 5:30 p.m. Jeffery 118 - Math Club

Speaker: Mike Roth

Title: Permuations given by polynomials

Abstract: How can the graphs of polynomials of one variable cross each other over x=0? You might suspect that any pattern is possible, and this is true as long as there are at most three polynomials. Rather surprisingly it is not true when there are four or more, a fact about polynomials only discovered in 2009. This talk will explain the problem, the answer, and some connections with other parts of mathematics.


Friday, January 27, 10:30 a.m. Jeffery 422 - Number Theory Seminar

Speaker: Vaidehee Thatte

Title: Some examples of Artin-Schreier Extensions of Valuation Fields (“No Theory – II”)

Abstract: We will discuss a few examples of Artin-Schreier extensions of valuation fields K of prime characteristic p and explicitly compute some invariants of ramification theory in each case. This is a continuation of the first "No Theory" talk.

Note/Recall: In the last talk, we discussed the basic structure of such extensions and properties of valuations involved.


Friday, January 27, 3:30 p.m. Jeffery 234 - Department Colloquium

Speaker: Todd Parsons

Title: The stochastic evolution of pathogen virulence

Abstract: Life history theory provides a powerful framework to understand the evolution of pathogens in both epidemic and endemic situations. This framework, however, relies on the assumption that

pathogen populations are very large and that one can neglect the effects of demographic stochasticity. I will explore the effects of finite population size on the evolution of pathogen virulence and transmission. I will show that demographic stochasticity introduces additional evolutionary forces that can qualitatively affect the dynamics and the evolutionary outcome, and discuss the importance of the shape of pathogen fitness landscape and host heterogeneity on the balance between mutation, selection and genetic drift. In particular, I will discuss scenarios where finite population size can either select for lower or higher virulence.

This is joint work with Troy Day, Sylvain Gandon and Amaury Lambert.

Contact Info

Department of Math & Stats
Jeffery Hall, 48 University Ave.
Kingston, ON Canada, K7L 3N6
Phone: (613) 533-2390
Fax: (613) 533-2964
mathstat@mast.queensu.ca
Office Hours: 8:30am-12:00pm & 1:00pm-4:30pm

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