Infosheet (October 10th, 2017)

Queen's University - Department of Mathematics and Statistics


Tuesday, October 10

Seminar in Free Probability and Random Matrices

Time: 4:00 p.m.

Place: Jeffery 319

Speaker: Josué Daniel Vázquez Becerra

Title: Liberation and the bounded cumulants property

Abstract Attached

Wednesday, October 11

Number Theory Seminar

Time: 1:30 p.m.

Place: Jeffery 319

Speaker: Vaidehee Thatte

Title: Ramification theory for degree p extensions of arbitrary valuation rings in mixed characteristic (0,p) - I

Abstract Attached

Wednesday, October 11

Curves Seminar

Time: 3:30 p.m.

Place: Jeffery 319

Speaker: Mike Roth

Title: The connectedness of linear sections

Abstract Attached

Friday, October 13

Grad Seminar

Time: 11:30 a.m.

Place: Jeffery 202

Narrator: Don Wescott

Title: The Strange New Science of Chaos (Documentary, 1989)

Abstract Attached

Friday, October 11

Department Colloquium

Time: 2:30 p.m.

Place: Jeffery 234

Speaker: Donald Richards, Pennsylvania State University

Title: Integrals of Characteristic Polynomials of Unitary Matrices, and Applications to the Riemann Zeta Function

Abstract Attached

Monday, October 16

Geometry and Representation Theory Seminar

Time: 4:45 p.m.

Place: Jeffery 319

Speaker: Ivan Dimitrov

Title: Left symmetric superalgebras

Abstract TBA

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


Tuesday, October 10, 4:00 p.m. Jeffery 319

Seminar in Free Probability and Random Matrices

Speaker: Josué Daniel Vázquez Becerra

Title: Liberation and the bounded cumulants property

Abstract: In this talk, we will show that conjugation by certain random unitary liberating matrices delivers the bounded cumulants property.

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


Wednesday, October 11, 1:30 p.m. Jeffery 319 - Number Theory Seminar

Speaker: Vaidehee Thatte

Title: Ramification theory for degree p extensions of arbitrary valuation rings in mixed characteristic (0,p) – I

Abstract: In classical ramification theory, we consider extensions of complete discrete valuation rings with perfect residue fields. We would like to study arbitrary valuation rings with possibly imperfect residue fields and possibly non-discrete valuations of rank \geq 1, since many interesting complications

arise for such rings. In particular, defect may occur (i.e. we can have a non-trivial extension, such that there is no extension of the residue field or the value group).

In this talk, we will discuss generalization and refinement of results in ramification theory when the residue characteristic p is positive, with focus on mixed characteristic (0,p).


Wednesday, October 11, 3:30 p.m. Jeffery 319 - Curves Seminar

Speaker: Mike Roth

Title: The connectedness of linear sections

Abstract: In preparation for proving the Fulton-Hansen connectedness theorem, we will prove results on the connectedness of intersections of an irreducible projective variety and a linear subspace, without requiring that the linear space be generic.


Friday, October 13, 11:30 a.m. Jeffery 202 - Grad Seminar

Narrator: Don Wescott

Title: The Strange New Science of Chaos (Documentary, 1989)

Abstract: Scientists are making surprising sense out of some very chaotic behavior in nature. In fact, many scientists now believe that turbulent processes like weather, waterfalls, irregular heartbeats, and even brain waves actually have a hidden and highly-ordered structure, a reversal of Isaac Newton's long-accepted vision of a clockwork universe unfolding with perfect precision. Explores a revolutionary new science that is learning how to analyze, and derive benefit from, a universe of chaos.


Friday, October 13, 2:30 p.m. Jeffery 234 - Department Colloquium

Speaker: Donald Richards

Title: Integrals of Characteristic Polynomials of Unitary Matrices, and Applications to the Riemann Zeta Function

Abstract: In recent research on the Riemann zeta function and the Riemann Hypothesis, it is important to calculate certain integrals involving the characteristic functions of N x N unitary matrices and to develop asymptotic expansions of these integrals as N goes to infinity. In this talk, I will derive exact formulas for several of these integrals, verify that the leading coefficients in their asymptotic expansions are non-zero, and relate these results to conjectures about the distribution of the zeros of the Riemann zeta function on the critical line. I will also explain how these calculations are related to mathematical statistics and to the hypergeometric functions of Hermitian matrix argument.

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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