Fall 2021 and Spring 2022 Analysis Seminars
Analysis Seminar
The seminar will meet Tuesdays, 4:00 p.m. in VV B139, unless otherwise indicated.
If you wish to invite a speaker please contact Betsy at stovall(at)math
Previous Analysis seminars
Summer/Fall 2017 Analysis Seminar Schedule
| date | speaker | institution | title | host(s) |
|---|---|---|---|---|
| September 8 in B239 | Tess Anderson | UW Madison | A Spherical Maximal Function along the Primes | Tonghai |
| September 12 | Title | |||
| September 19 | Brian Street | UW Madison | Convenient Coordinates | Betsy |
| September 26 | Hiroyoshi Mitake | Hiroshima University | Derivation of multi-layered interface system and its application | Hung |
| October 3 | Joris Roos | UW Madison | A polynomial Roth theorem on the real line | Betsy |
| October 10 | Michael Greenblatt | UI Chicago | Title | Andreas |
| October 17 | David Beltran | Basque Center of Applied Mathematics | Fefferman-Stein inequalities | Andreas |
| October 24 | Xiaochun Li | UIUC | Title | Betsy |
| Thursday, October 26 | Fedya Nazarov | Kent State University | Title | Betsy, Andreas |
| Friday, October 27 in B239 | Stefanie Petermichl | University of Toulouse | Title | Betsy, Andreas |
| Wednesday, November 1 in B239 | Shaoming Guo | Indiana University | Title | Andreas |
| November 14 | Naser Talebizadeh Sardari | UW Madison | Quadratic forms and the semiclassical eigenfunction hypothesis | Betsy |
| November 28 | Xianghong Chen | UW Milwaukee | Title | Betsy |
| December 5 | Title | |||
| December 12 | Alex Stokolos | GA Southern | Title | Andreas |
Abstracts
Brian Street
Title: Convenient Coordinates
Abstract: We discuss the method of picking a convenient coordinate system adapted to vector fields. Let X_1,...,X_q be either real or complex C^1 vector fields. We discuss the question of when there is a coordinate system in which the vector fields are smoother (e.g., C^m, or C^\infty, or real analytic). By answering this in a quantitative way, we obtain coordinate charts which can be used as generalized scaling maps. When the vector fields are real this is joint work with Stovall, and continues in the line of quantitative sub-Riemannian geometry initiated by Nagel, Stein, and Wainger. When the vector fields are complex one obtains a geometry with more structure which can be thought of as "sub-Hermitian".
Hiroyoshi Mitake
Title: Derivation of multi-layered interface system and its application
Abstract: In this talk, I will propose a multi-layered interface system which can be formally derived by the singular limit of the weakly coupled system of the Allen-Cahn equation. By using the level set approach, this system can be written as a quasi-monotone degenerate parabolic system. We give results of the well-posedness of viscosity solutions, and study the singularity of each layers. This is a joint work with H. Ninomiya, K. Todoroki.
Joris Roos
Title: A polynomial Roth theorem on the real line
Abstract: For a polynomial P of degree greater than one, we show the existence of patterns of the form (x,x+t,x+P(t)) with a gap estimate on t in positive density subsets of the reals. This is an extension of an earlier result of Bourgain. Our proof is a combination of Bourgain’s approach and more recent methods that were originally developed for the study of the bilinear Hilbert transform along curves. This talk is based on a joint work with Polona Durcik and Shaoming Guo.
David Beltran
Fefferman Stein Inequalities
Given an operator T, we focus on obtaining two-weighted inequalities in which the weights are related via certain maximal function. These inequalites, which originated in work of Fefferman and Stein, have been established in an optimal way for different classical operators in Harmonic Analysis. In this talk, we survey some classical results and we present some recent Fefferman-Stein inequalities for pseudodifferential operators and for the solution operators to dispersive equations.
Naser Talebizadeh Sardari
Quadratic forms and the semiclassical eigenfunction hypothesis
Let [math]\displaystyle{ Q(X) }[/math] be any integral primitive positive definite quadratic form in [math]\displaystyle{ k }[/math] variables, where [math]\displaystyle{ k\geq4 }[/math], and discriminant [math]\displaystyle{ D }[/math]. For any integer [math]\displaystyle{ n }[/math], we give an upper bound on the number of integral solutions of [math]\displaystyle{ Q(X)=n }[/math] in terms of [math]\displaystyle{ n }[/math], [math]\displaystyle{ k }[/math], and [math]\displaystyle{ D }[/math]. As a corollary, we prove a conjecture of Lester and Rudnick on the small scale equidistribution of almost all functions belonging to any orthonormal basis of a given eigenspace of the Laplacian on the flat torus [math]\displaystyle{ \mathbb{T}^d }[/math] for [math]\displaystyle{ d\geq 5 }[/math]. This conjecture is motivated by the work of Berry\cite{Berry, Michael} on semiclassical eigenfunction hypothesis.
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