Difference between revisions of "Colloquia/Fall18"

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= Mathematics Colloquium =
 
= Mathematics Colloquium =
  
 
All colloquia are on Fridays at 4:00 pm in Van Vleck B239, '''unless otherwise indicated'''.
 
All colloquia are on Fridays at 4:00 pm in Van Vleck B239, '''unless otherwise indicated'''.
  
== Fall 2013 ==
+
The calendar for spring 2019 can be found [[Colloquia/Spring2019|here]].
 +
 
 +
==Spring 2019==
  
 
{| cellpadding="8"
 
{| cellpadding="8"
!align="left" | date
+
!align="left" | date  
 
!align="left" | speaker
 
!align="left" | speaker
 
!align="left" | title
 
!align="left" | title
 
!align="left" | host(s)
 
!align="left" | host(s)
 
|-
 
|-
|Sept 13
+
|Jan 25
|
+
| [http://www.users.miamioh.edu/randrib/ Beata Randrianantoanina] (Miami University Ohio) WIMAW
|
+
|[[#Beata Randrianantoanina (Miami University Ohio) |  Some nonlinear problems in the geometry of Banach spaces and their applications  ]]
 +
| Tullia Dymarz
 
|
 
|
 
|-
 
|-
|Sept 20
+
|Jan 30 '''Wednesday'''
|[http://www.math.neu.edu/people/profile/valerio-toledano-laredo Valerio Toledano Laredo] (Northeastern)
+
| [https://services.math.duke.edu/~pierce/ Lillian Pierce] (Duke University)
 +
|[[#Lillian Pierce (Duke University) |  Short character sums  ]]
 +
| Boston and Street
 
|
 
|
|Gurevich
 
 
|-
 
|-
|'''Wed, Sept 25'''
+
|Jan 31 '''Thursday'''
|[http://mypage.iu.edu/~alindens/ Ayelet Lindenstrauss]
+
| [http://www.math.tamu.edu/~dbaskin/ Dean Baskin] (Texas A&M)
 +
|[[#Dean Baskin (Texas A&M) | Radiation fields for wave equations  ]]
 +
| Street
 
|
 
|
|Meyer
 
 
|-
 
|-
|Sept 27 (Distinguished lecture)
+
|Feb 1
|[http://www.cs.berkeley.edu/~demmel/ Jim Demmel] (Berkeley)
+
| [https://services.math.duke.edu/~jianfeng/ Jianfeng Lu] (Duke University)
 +
|[[# TBA|  TBA  ]]
 +
| Qin
 
|
 
|
|Gurevich
 
 
|-
 
|-
|Oct 4
+
|Feb 5 '''Tuesday'''
|[http://www.math.tamu.edu/~sottile/ Frank Sottile] (Texas A&M)
+
| [http://www.math.tamu.edu/~alexei.poltoratski/ Alexei Poltoratski] (Texas A&M University)
 +
|[[# TBA|  TBA  ]]
 +
| Denisov
 
|
 
|
|Caldararu
 
 
|-
 
|-
|Oct 11
+
|Feb 8
|
+
| [https://sites.math.northwestern.edu/~anaber/ Aaron Naber] (Northwestern)
|
+
|[[#Aaron Naber (Northwestern) |  A structure theory for spaces with lower Ricci curvature bounds  ]]
 +
| Street
 
|
 
|
 
|-
 
|-
|Oct 15
+
|Feb 15
|Reserved for a distinguished lecture
+
|  
 +
|[[# TBA|  TBA  ]]
 +
|
 
|
 
|
|Valko
 
 
|-
 
|-
|<strike>Oct 18</strike>
+
|Feb 22
|No colloquium due to the distinguished lecture
+
| [https://people.math.osu.edu/cueto.5/ Angelica Cueto] (Ohio State)
 +
|[[# TBA|  TBA  ]]
 +
| Erman and Corey
 
|
 
|
|
 
|-
 
|Oct 25
 
|[http://www.math.umn.edu/~garrett/ Paul Garrett] (Minnesota)
 
|
 
|Gurevich
 
|
 
|
 
|-
 
|Nov 1
 
|[http://www.cs.utexas.edu/~alewko/ Allison Lewko] (Microsoft Research New England)
 
|
 
|Stovall
 
|-
 
|Nov 8
 
|
 
|
 
|}
 
 
== Spring 2014 ==
 
 
{| cellpadding="8"
 
!align="left" | date
 
!align="left" | speaker
 
!align="left" | title
 
!align="left" | host(s)
 
 
|-
 
|-
|Jan 24
+
|March 4
|
+
| [http://www-users.math.umn.edu/~sverak/ Vladimir Sverak] (Minnesota) Wasow lecture
|
+
|[[# TBA| TBA ]]
 +
| Kim
 
|
 
|
 
|-
 
|-
|Jan 31
+
|March 8
|
+
| [https://orion.math.iastate.edu/jmccullo/index.html Jason McCullough] (Iowa State)
|
+
|[[# TBA|  TBA  ]]
 +
| Erman
 
|
 
|
 
|-
 
|-
|Feb 7
+
|March 15
|
+
| Maksym Radziwill (Caltech)
|
+
|[[# TBA|  TBA  ]]
 +
| Marshall
 
|
 
|
 
|-
 
|-
|Feb 14
+
|March 29
|
+
| Jennifer Park (OSU)
|
+
|[[# TBA|  TBA  ]]
 +
| Marshall
 
|
 
|
 
|-
 
|-
|Feb 21
+
|April 5
|
+
| Ju-Lee Kim (MIT)
|
+
|[[# TBA|  TBA  ]]
 +
| Gurevich
 
|
 
|
 
|-
 
|-
|Feb 28
+
|April 12
|
+
| Evitar Procaccia (TAMU)
|
+
|[[# TBA|  TBA  ]]
 +
| Gurevich
 
|
 
|
 
|-
 
|-
|March 7
+
|April 19
|
+
| [http://www.math.rice.edu/~jkn3/ Jo Nelson] (Rice University)
|
+
|[[# TBA|  TBA  ]]
 +
| Jean-Luc
 
|
 
|
 
|-
 
|-
|March 14
+
|April 26
|
+
| [https://www.brown.edu/academics/applied-mathematics/faculty/kavita-ramanan/home Kavita Ramanan] (Brown University)
|
+
|[[# TBA| TBA  ]]
|
+
| WIMAW
|-  
 
|<strike>March 21</strike>
 
|'''Spring Break'''
 
|No Colloquium
 
 
|
 
|
 
|-
 
|-
|March 28
+
|May 3
 +
| Tomasz Przebinda (Oklahoma)
 +
|[[# TBA|  TBA  ]]
 +
| Gurevich
 
|
 
|
|
 
|
 
|-
 
|April 4
 
|
 
|
 
|
 
|-
 
|April 11
 
|[http://www.cs.uchicago.edu/people/risi Risi Kondor] (Chicago)
 
|
 
|Gurevich
 
|-
 
|April 18 (Wasow Lecture)
 
|[http://mathnt.mat.jhu.edu/sogge/ Christopher Sogge] (Johns Hopkins)
 
|
 
|A. Seeger
 
|-
 
|April 25
 
|[http://www.charlesdoran.net//Charles Doran](University of Alberta)
 
|
 
|Song
 
|-
 
|May 2
 
|[http://www.stat.uchicago.edu/~lekheng/ Lek-Heng Lim] (Chicago)
 
|
 
|Boston
 
|-
 
|May 9
 
|[http://www.ma.utexas.edu/users/rward/ Rachel Ward] (UT Austin)
 
|
 
|WIMAW
 
 
|}
 
|}
  
== Past talks ==
+
== Abstracts ==
 +
 
 +
===Beata Randrianantoanina (Miami University Ohio)===
 +
 
 +
Title: Some nonlinear problems in the geometry of Banach spaces and their applications.
 +
 
 +
Abstract: Nonlinear problems in the geometry of Banach spaces have been studied since the inception of the field. In this talk I will outline some of the history, some of modern applications, and some open directions of research. The talk will be accessible to graduate students of any field of mathematics.
 +
 
 +
===Lillian Pierce (Duke University)===
 +
 
 +
Title: Short character sums
 +
 
 +
Abstract: A surprisingly diverse array of problems in analytic number theory have at their heart a problem of bounding (from above) an exponential sum, or its multiplicative cousin, a so-called character sum. For example, both understanding the Riemann zeta function or Dirichlet L-functions inside the critical strip, and also counting solutions to Diophantine equations via the circle method or power sieve methods, involve bounding such sums. In general, the sums of interest fall into one of two main regimes: complete sums or incomplete sums, with this latter regime including in particular “short sums.” Short sums are particularly useful, and particularly resistant to almost all known methods. In this talk, we will see what makes a sum “short,” sketch why it would be incredibly powerful to understand short sums, and discuss a curious proof from the 1950’s which is still the best way we know to bound short sums. We will end by describing new work which extends the ideas of this curious proof to bound short sums in much more general situations.
 +
 
 +
===Dean Baskin (Texas A&M)===
 +
 
 +
Title: Radiation fields for wave equations
 +
 
 +
Abstract: Radiation fields are rescaled limits of solutions of wave equations near "null infinity" and capture the radiation pattern seen by a distant observer. They are intimately connected with the Fourier and Radon transforms and with scattering theory. In this talk, I will define and discuss radiation fields in a few contexts, with an emphasis on spacetimes that look flat near infinity. The main result is a connection between the asymptotic behavior of the radiation field and a family of quantum objects on an associated asymptotically hyperbolic space.
 +
 
 +
===Aaron Naber (Northwestern)===
 +
 
 +
Title:  A structure theory for spaces with lower Ricci curvature bounds.
 +
 
 +
Abstract:  One should view manifolds (M^n,g) with lower Ricci curvature bounds as being those manifolds with a well behaved analysis, a point which can be rigorously stated.  It thus becomes a natural question, how well behaved or badly behaved can such spaces be?  This is a nonlinear analogue to asking how degenerate can a subharmonic or plurisubharmonic function look like.  In this talk we give an essentially sharp answer to this question.  The talk will require little background, and our time will be spent on understanding the basic statements and examples.  The work discussed is joint with Cheeger, Jiang and with Li.
 +
 
 +
 
 +
== Past Colloquia ==
 +
 
 +
[[Colloquia/Blank|Blank]]
 +
 
 +
[[Colloquia/Fall2018|Fall 2018]]
 +
 
 +
[[Colloquia/Spring2018|Spring 2018]]
 +
 
 +
[[Colloquia/Fall2017|Fall 2017]]
 +
 
 +
[[Colloquia/Spring2017|Spring 2017]]
 +
 
 +
[[Archived Fall 2016 Colloquia|Fall 2016]]
 +
 
 +
[[Colloquia/Spring2016|Spring 2016]]
 +
 
 +
[[Colloquia/Fall2015|Fall 2015]]
 +
 
 +
[[Colloquia/Spring2014|Spring 2015]]
 +
 
 +
[[Colloquia/Fall2014|Fall 2014]]
 +
 
 +
[[Colloquia/Spring2014|Spring 2014]]
 +
 
 +
[[Colloquia/Fall2013|Fall 2013]]
 +
 
 +
[[Colloquia 2012-2013|Spring 2013]]
  
Last year's schedule: [[Colloquia 2012-2013]]
+
[[Colloquia 2012-2013#Fall 2012|Fall 2012]]

Latest revision as of 09:43, 24 January 2019

Mathematics Colloquium

All colloquia are on Fridays at 4:00 pm in Van Vleck B239, unless otherwise indicated.

The calendar for spring 2019 can be found here.

Spring 2019

date speaker title host(s)
Jan 25 Beata Randrianantoanina (Miami University Ohio) WIMAW Some nonlinear problems in the geometry of Banach spaces and their applications Tullia Dymarz
Jan 30 Wednesday Lillian Pierce (Duke University) Short character sums Boston and Street
Jan 31 Thursday Dean Baskin (Texas A&M) Radiation fields for wave equations Street
Feb 1 Jianfeng Lu (Duke University) TBA Qin
Feb 5 Tuesday Alexei Poltoratski (Texas A&M University) TBA Denisov
Feb 8 Aaron Naber (Northwestern) A structure theory for spaces with lower Ricci curvature bounds Street
Feb 15 TBA
Feb 22 Angelica Cueto (Ohio State) TBA Erman and Corey
March 4 Vladimir Sverak (Minnesota) Wasow lecture TBA Kim
March 8 Jason McCullough (Iowa State) TBA Erman
March 15 Maksym Radziwill (Caltech) TBA Marshall
March 29 Jennifer Park (OSU) TBA Marshall
April 5 Ju-Lee Kim (MIT) TBA Gurevich
April 12 Evitar Procaccia (TAMU) TBA Gurevich
April 19 Jo Nelson (Rice University) TBA Jean-Luc
April 26 Kavita Ramanan (Brown University) TBA WIMAW
May 3 Tomasz Przebinda (Oklahoma) TBA Gurevich

Abstracts

Beata Randrianantoanina (Miami University Ohio)

Title: Some nonlinear problems in the geometry of Banach spaces and their applications.

Abstract: Nonlinear problems in the geometry of Banach spaces have been studied since the inception of the field. In this talk I will outline some of the history, some of modern applications, and some open directions of research. The talk will be accessible to graduate students of any field of mathematics.

Lillian Pierce (Duke University)

Title: Short character sums

Abstract: A surprisingly diverse array of problems in analytic number theory have at their heart a problem of bounding (from above) an exponential sum, or its multiplicative cousin, a so-called character sum. For example, both understanding the Riemann zeta function or Dirichlet L-functions inside the critical strip, and also counting solutions to Diophantine equations via the circle method or power sieve methods, involve bounding such sums. In general, the sums of interest fall into one of two main regimes: complete sums or incomplete sums, with this latter regime including in particular “short sums.” Short sums are particularly useful, and particularly resistant to almost all known methods. In this talk, we will see what makes a sum “short,” sketch why it would be incredibly powerful to understand short sums, and discuss a curious proof from the 1950’s which is still the best way we know to bound short sums. We will end by describing new work which extends the ideas of this curious proof to bound short sums in much more general situations.

Dean Baskin (Texas A&M)

Title: Radiation fields for wave equations

Abstract: Radiation fields are rescaled limits of solutions of wave equations near "null infinity" and capture the radiation pattern seen by a distant observer. They are intimately connected with the Fourier and Radon transforms and with scattering theory. In this talk, I will define and discuss radiation fields in a few contexts, with an emphasis on spacetimes that look flat near infinity. The main result is a connection between the asymptotic behavior of the radiation field and a family of quantum objects on an associated asymptotically hyperbolic space.

Aaron Naber (Northwestern)

Title: A structure theory for spaces with lower Ricci curvature bounds.

Abstract: One should view manifolds (M^n,g) with lower Ricci curvature bounds as being those manifolds with a well behaved analysis, a point which can be rigorously stated. It thus becomes a natural question, how well behaved or badly behaved can such spaces be? This is a nonlinear analogue to asking how degenerate can a subharmonic or plurisubharmonic function look like. In this talk we give an essentially sharp answer to this question. The talk will require little background, and our time will be spent on understanding the basic statements and examples. The work discussed is joint with Cheeger, Jiang and with Li.


Past Colloquia

Blank

Fall 2018

Spring 2018

Fall 2017

Spring 2017

Fall 2016

Spring 2016

Fall 2015

Spring 2015

Fall 2014

Spring 2014

Fall 2013

Spring 2013

Fall 2012