Seminars and Colloquia by Series

Applied Macaulay2 Tutorials

Series
Other Talks
Time
Thursday, July 27, 2017 - 09:00 for 8 hours (full day)
Location
Skiles 005 and 006
Speaker
Macaulay2Georgia Tech
Dates: July 27-29 (Thu-Sat). Schedule will appear here. These tutorials are intended to appeal to participants with any level of prior M2 experience. The topics will range from the basic functionality of M2 to modeling problems in the M2 language to more specialized tutorials on algebraic statistics and numerical algebraic geometry. We will also reserve ample time for practice and Q&A sessions. Registration is free, but please fill the form here.

Parallel Connections of Bilinear Systems

Series
Other Talks
Time
Thursday, May 25, 2017 - 11:00 for 1 hour (actually 50 minutes)
Location
TSRB 132
Speaker
Guenther Dirr University of Wuzburg
First, we present a necessary and sufficient conditions for accessibility of bilinear systems evolving on semisimple (matrix) Lie groups. From this, we derive a controllability criterion for parallel connections of bilinear systems which gets a if-and-only-if condition in the case of compact Lie groups. Finally, we present a key application from quantum control.

Opening meeting for the Stability and Transitions in Physical Processes (TraX)

Series
Other Talks
Time
Thursday, May 4, 2017 - 08:03 for 8 hours (full day)
Location
Skiles 005
Speaker
Several speakers 8 Institutions.
The TraX project is an inter-university effort, involving researchers from 8 universities, aimed at elucidating the geometric structures in phase space which determine the speed and nature of chemical reactions and how they are affected by external influences such as light pulses or noise. The effort is highly interdisciplinary and it involves Mathematics (Dynamical Systems), Numerical Computations, Physics, and Chemistry all working together to understand experimental phenomena and make predictions. The project has been funded by the European Research Council, Mathematics Division for 4 years and it will sponsor visits of European scientists to GT and provide opportunities for graduate students to collaborate in this area. http://traxkickoff.gatech.edu/

Polyrhythms everywhere!

Series
Other Talks
Time
Monday, April 10, 2017 - 19:00 for 1.5 hours (actually 80 minutes)
Location
Bill Moore Student Sucess Center - Cleary Theatre
Speaker
Tom MorleyGeorgia Institute of Technology
Rhythm is a great thing. It therefore follows that several rhythms at once is even greater. Learn 2:3, 3:4, and 4:5, and a little bit about fractions. Polyrhythms when sped up, lead to harmony and scales. Slower polyrhythms happen in celestial mechanics. A little bit of music, a little bit of mathematics.

Southeast Geometry Seminar

Series
Other Talks
Time
Sunday, February 26, 2017 - 08:55 for 8 hours (full day)
Location
Skiles 006
Speaker
six speakers on topics in geometryfrom various universities
Mozghan Entekhabi (Wichita State University) Radial Limits of Bounded Nonparametric Prescribed Mean Curvature Surfaces ; Miyuki Koiso (Kyushu University) Stability and bifurcation for surfaces with constant mean curvature ; Vladimir Oliker (Emory University) Freeform lenses, Jacobian equations, and supporting quadric method(SQM) ; Sungho Park (Hankuk University of Foreign Studies) Circle-foliated minimal and CMC surfaces in S^3 ; Yuanzhen Shao (Purdue University) Degenerate and singular elliptic operators on manifolds with singularities ; Ray Treinen (Texas State University) Surprising non-uniqueness for the 2D floating ball ; See http://www.math.uab.edu/sgs/ for abstracts and further details.

Tour & Endgame Trajectory Design Using Dynamical Systems Theory

Series
Other Talks
Time
Monday, February 20, 2017 - 15:00 for 1 hour (actually 50 minutes)
Location
Guggenheim Building Room 442
Speaker
Rodney L. AndersonJet Propulsion Lab.
New and proposed interplanetary missions increasingly require the design of trajectories within challenging multi-body environments that stress or exceed the capabilities of the two-body design methodologies typically used over the last several decades. These current methods encounter difficulties because they often require appreciable user interaction, result in trajectories that require significant amounts of propellant, or miss potential mission-enabling options. The use of dynamical systems methods applied to three-body and multi-body models provides a pathway to obtain a fuller theoretical understanding of the problem that can then result in significant improvements to trajectory design in each of these areas. In particular, the computation of periodic Lagrange point and resonant orbits along with their associated invariant manifolds and heteroclinic connections are crucial to finding the dynamical channels that provide new or more optimal solutions. These methods are particularly effective for mission types that include multi-body tours, Earth-Moon transfers, approaches to moons, and trajectories to asteroids. The inclusion of multi-body effects early in the analysis for these applications is key to providing a more complete set of solutions that includes improved trajectories that may otherwise be missed when using two-body methods. This seminar will focus on two representative trajectory design applications that are especially challenging. The first is the design of tours using flybys of planets or moons with a particular emphasis on the Galilean moons and Europa. In this case, the exploration of the design space using the invariant manifolds of resonant and Lyapunov orbits provides information such as the resonance transitions that are required as part of the tour. The second application includes endgame scenarios, which typically involve an approach to a moon with an objective of either capturing into orbit around the moon or landing on the surface. Often, the invariant manifolds of particular orbits may be used in this case to provide a wide set of approach options for both capture and landing analyses. New methods will also be discussed that provide a foundation for rigorously analyzing the transit of trajectories through the libration point regions that is necessary for the approach and capture phase for bodies such as Europa and the Moon. These methods provide a fundamentally new method to search for the invariant manifolds of orbits and hyperbolic invariant sets associated with libration points while giving additional insight into the dynamics of the flow in these regions.

Numerical Algebraic Geometry adjoint meeting

Series
Other Talks
Time
Sunday, January 8, 2017 - 09:00 for 8 hours (full day)
Location
Skiles 005
Speaker
Anton LeykinGeorgia Tech

Please Note: Tentative schedule: 9-12: mini-presentations, informal discussion, Q&A, led by Jose Rodriguez (numerical decomposition), Elizabeth Gross (reaction networks), Dan Bates (numerical AG for sciences and engineering); 12-1: lunch; 1pm+: catch flights, continue talking in groups.

This is an informal get-together of the Joint Meetings participants and locals interested in various aspects of Numerical Algebraic Geometry. This area combines numerical analysis and nonlinear algebra in algorithms that found various applications in other parts of mathematics and outside. (If interested in joining, email leykin@math.gatech.edu)

Joint Stochastics-Math Finance Seminar - Three puzzles in quantitative finance

Series
Other Talks
Time
Wednesday, November 16, 2016 - 13:00 for 1 hour (actually 50 minutes)
Location
Skiles 005
Speaker
Viorel CosteanuJ.P. Morgan
1. One day before the election, the statistics site 538 predicted a 70% chance of a Clinton victory. How do we judge the quality of probabilistic prediction models? Ultimately every quant finance model has a probabilistic prediction model at its core, for instance the geometric Brownian Motion is the core of Black-Scholes. I will explain the Basel Traffic Ligths Framework and then I'll ask the audience to think how the framework can be extended. 2. Multi-factor local volatility. I will explain Dupire's local volatility model and ask how this model can be extended to a multi-factor framework. 3. Model overfitting. There are objective criteria for statistical model overfitting, such as AIC. Such criteria don't exist for risk-neutral derivatives pricing models.

Faculty Meeting

Series
Other Talks
Time
Tuesday, October 25, 2016 - 11:05 for 1 hour (actually 50 minutes)
Location
Skiles 005
Speaker
Prasad TetaliSchool of Mathematics, Georgia Tech

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