Difference between revisions of "PDE Geometric Analysis seminar"

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===[[Previous PDE/GA seminars]]===
 
===[[Previous PDE/GA seminars]]===
  
= Seminar Schedule Spring 2013 =
+
 
 +
= Seminar Schedule Fall 2013 =
 
{| cellpadding="8"
 
{| cellpadding="8"
 
!align="left" | date   
 
!align="left" | date   
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!align="left" | host(s)
 
!align="left" | host(s)
 
|-
 
|-
|-
+
|September 9
|February 4
+
|Greg Drugan (U. of Washington)
|[http://math.postech.ac.kr/~mjbae/ Myoungjean Bae (POSTECH)]
+
|[[#Greg Drugan (U. of Washington) |
|[[#Myoungjean Bae (POSTECH) |
+
Construction of immersed self-shrinkers]]
Transonic shocks for Euler-Poisson system and related problems]]
 
|Feldman
 
|-
 
|-
 
|February 18
 
|Mike Cullen (Met. Office, UK)
 
|[[ #Mike Cullen (Met. Office, UK)|
 
Modelling the uncertainty in predicting large-scale atmospheric circulations.]]
 
|Feldman
 
|-
 
|-
 
|March 18
 
|Mohammad Ghomi(Math. Georgia Tech)
 
|[[ #Mohammad Ghomi(Math. Georgia Tech)|
 
Tangent lines, inflections, and vertices of closed curves.]]
 
 
|Angenent
 
|Angenent
 
|-
 
|-
|-
 
|April 8
 
|[http://www.maths.ox.ac.uk/contact/details/xiang Wei Xiang (Oxford)]
 
|[[ #Wei Xiang (Oxford)|
 
Shock Diffraction Problem to the
 
Two Dimensional Nonlinear Wave System and Potential Flow Equation.]]
 
|Feldman
 
|-
 
|-
 
|Thursday April 25, Time: 3:30, Room: 901 Van Vleck (Note: Special Day, Room)
 
|[http://math.wvu.edu/~adriant/CV1.html Adrian Tudorascu (West Virginia University)]
 
|[[ #Adrian Tudorascu (West Virginia University)|One-dimensional pressureless
 
Euler/Euler-Poisson systems with/without viscosity
 
.]]
 
|Feldman
 
|-
 
|-
 
|May 6
 
|[http://www.icmat.es/dcordoba Diego Cordoba (Madrid)]
 
|[[#Diego Cordoba (Madrid) |
 
Interface dynamics for incompressible fluids. ]]
 
|Kiselev
 
|-
 
|}
 
 
= Abstracts =
 
 
===Myoungjean Bae (POSTECH)===
 
''Transonic shocks for Euler-Poisson system and related problems''
 
 
Abstract: Euler-Poisson system models various physical phenomena
 
including the propagation of electrons in submicron semiconductor
 
devices and plasmas, and the biological transport of ions for channel
 
proteins. I will explain difference between Euler system and
 
Euler-Poisson system and mathematical difficulties arising due to this
 
difference. And, recent results about subsonic flow and transonic flow
 
for Euler-Poisson system will be presented. This talk is based on
 
collaboration with Ben Duan and Chunjing Xie.
 
 
 
===Mike Cullen (Met. Office, UK)===
 
''Modelling the uncertainty in predicting large-scale atmospheric circulations''
 
 
Abstract: This talk describes work on quantifying the uncertainty in climate models by using data assimilation techniques;
 
and in estimating the properties of large-scale atmospheric flows by using asymptotic limit solutions.
 
 
===Mohammad Ghomi(Math. Georgia Tech)===
 
 
>> Abstract: We show that every smooth closed curve C immersed in Euclidean 3-space satisfies the sharp inequality 2(P+I)+V >5 which relates the numbers P of pairs of parallel tangent lines, I of inflections (or points of vanishing curvature), and V of vertices (or points of vanishing torsion) of C. The proof, which employs curve shortening flow with surgery, is based on corresponding inequalities for the numbers of double points, singularities, and inflections of closed curves in the real projective plane and the sphere which intersect every closed geodesic. These findings extend some classical results in curve theory including works of Moebius, Fenchel, and Segre, which is also known as Arnold's ``tennis ball theorem".
 
 
===Wei Xiang (Oxford)===
 
 
Abstract: The vertical shock which initially separates two
 
piecewise constant Riemann data, passes the wedge from left to right,
 
then shock diffraction phenomena will occur and the incident shock
 
becomes a transonic shock. Here we study this problem on nonlinear
 
wave system as well as on potential flow equations. The existence and
 
the optimal regularity across sonic circle of the solutions to this
 
problem is established. The comparison of these two systems is
 
discussed, and some related open problems are proposed.
 
 
===Adrian Tudorascu (West Virginia University)===
 
 
Abstract:
 
This chalk & board presentation will start with an interesting motivation for these systems (the simplest of which was shown to model adhesion dynamics/ballistic aggregation by Zeldovich in 1970 in a paper published in "Astronomy & Astrophysics"). A general existence result for one-dimensional pressureless Euler/Euler-Poisson systems with/without viscosity will be discussed. This is achieved via entropy solutions for some appropriate scalar conservation laws; I will show that these solutions encode all the information necessary to obtain solutions for the pressureless systems. I will also discuss the stability and uniqueness of solutions, which is obtained via a contraction principle in the Wasserstein metric. This is based on joint work with T. Nguyen (U. Akron).
 
 
===Diego Cordoba (Madrid)===
 
 
Abstract: We consider the evolution of an interface generated between two immiscible,
 
incompressible and irrotational fluids. Specifically we study the Muskat equation (the
 
interface between oil and water in sand) and water wave equation (interface between water
 
and vacuum).  For both equations we will study well-posedness and the existence of smooth
 
initial data for which the smoothness of the interface breaks down in finite time. We
 
will also discuss some open problems.
 
 
= Seminar Schedule Fall 2013 =
 
{| cellpadding="8"
 
!align="left" | date 
 
!align="left" | speaker
 
!align="left" | title
 
!align="left" | host(s)
 
 
|-
 
|-
 
|October 7
 
|October 7

Revision as of 14:53, 7 September 2013

The seminar will be held in room B115 of Van Vleck Hall on Mondays from 3:30pm - 4:30pm, unless indicated otherwise.

Previous PDE/GA seminars

Seminar Schedule Fall 2013

date speaker title host(s)
September 9 Greg Drugan (U. of Washington)
Construction of immersed self-shrinkers
Angenent
October 7 Guo Luo (Caltech)

TBA.

Kiselev
November 18 Roman Shterenberg (UAB)

TBA.

Kiselev


Seminar Schedule Spring 2014

date speaker title host(s)
March 3 Hongjie Dong (Brown)

TBA.

Kiselev
April 7 Zoran Grujic (University of Virginia)

TBA.

Kiselev