Informal Geometry and Topology Seminar
Questions or comments?

Posted August 27, 2018

1:30 pm - 3:00 pm Lockett 233
Lucas Meyers, Louisiana State University

TBA

Geometry and Topology Seminar
Seminar website

Posted August 14, 2018

Last modified September 17, 2018

Joshua Sabloff, Haverford College

Length and Width of Lagrangian Cobordisms

Abstract: In this talk, I will discuss two measurements of Lagrangian cobordisms between Legendrian submanifolds in symplectizations: their length and their relative Gromov width. The Gromov width, in particular, is a fundamental global invariant of symplectic manifolds, and a relative version of that width helps understand the geometry of Lagrangian submanifolds of a symplectic manifold. Lower bounds on both the length and the width may be produced by explicit constructions; this talk will concentrate on upper bounds that arise from a filtered version of Legendrian contact homology, a Floer-type invariant. This is joint work with Lisa Traynor.

Algebra and Number Theory Seminar
Questions or comments?

Posted September 7, 2018

Last modified September 30, 2018

Armin Straub, University of South Alabama

The congruences of Fermat, Euler, Gauss and stronger versions thereof

The Gauss congruences are a natural generalization of the more familiar Fermat and Euler congruences. Interesting families of combinatorial and number theoretic sequences are known to satisfy these congruences. Though a general classification remains wide open, Minton characterized constant recursive sequences satisfying Gauss congruences. We consider the natural extension of this question to Laurent coefficients of multivariate rational functions. One of the motivations for studying Gauss congruences lies in the fact that a certain interesting class of sequences, related to Ap'ery-like constructions of linear forms in zeta values, conjecturally satisfies stronger versions of these congruences. We outline this story and indicate recent developments. The first part of this talk is based on joint work with Frits Beukers and Marc Houben, while the second part includes joint work with Dermot McCarthy and Robert Osburn.

Applied Analysis Seminar
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Posted September 13, 2018

3:30 pm - 4:30 pm Lockett 233
Blaise Bourdin, Department of Mathematics, Louisiana State University

Variational phase-field models of fracture

Informal Geometry and Topology Seminar
Questions or comments?

Posted August 27, 2018

1:30 pm - 3:00 pm Lockett 233
Sudipta Ghosh, Louisiana State University

TBA

Geometry and Topology Seminar
Seminar website

Posted September 14, 2018

Last modified October 1, 2018

Scott Baldridge, LSU

TBA

Colloquium
Questions or comments?

Posted August 14, 2018

3:30 pm - 4:20 pm TBA
Hongjie Dong, Brown University

TBA

Applied Analysis Seminar
Questions or comments?

Posted August 29, 2018

3:30 pm - 4:30 pm Lockett 233
Robert Lipton, Mathematics Department, LSU

Predicting complex fracture evolution using nonlocal dynamics

The dynamic fracture of brittle solids is a particularly interesting collective interaction connecting both large and small length scales. Apply enough stress or strain to a sample of brittle material and one eventually snaps bonds at the atomistic scale leading to fracture of the macroscopic specimen. We discuss a nonlocal model for calculating dynamic fracture. The force interaction is derived from a double well strain energy density function, resulting in a non- monotonic material model. The material properties change in response to evolving internal forces eliminating the need for a separate phase field to model the fracture set. (However there is no free lunch and the discrete model is posed in terms of a dense matrix and parallel computation must be used to solve fracture problems.) The model can be viewed as a regularized fracture model. In the limit of zero nonlocal interaction, the model recovers a sharp interface evolution characterized by the classic Griffith free energy of brittle fracture with elastic deformation satisfying the linear elastic wave equation off the crack set. We conclude with a numerical analysis of the model which is joint work with Prashant Jha.

Computational Mathematics Seminar

Posted September 5, 2018

3:30 pm - 4:30 pm 1034 Digital Media Center
Shawn Walker, LSU

TBA

Informal Geometry and Topology Seminar
Questions or comments?

Posted August 27, 2018

1:30 pm - 3:00 pm Lockett 233
Rima Chatterjee, Louisiana State University

TBA

Geometry and Topology Seminar
Seminar website

Posted August 14, 2018

3:30 pm - 4:30 pm Lockett 233
Matthew Haulmark, Vanderbilt

TBA

Applied Analysis Seminar
Questions or comments?

Posted August 29, 2018

3:30 pm - 4:30 pm Lockett 233
Robert Lipton, Mathematics Department, LSU

Understanding nonlocal models for fracture simulation

The peridynamic model is increasingly being used and developed for fracture simulation. In this talk we go "under the hood" to see how nonlocal models can capture the fracture process and to see how they relate to existing fracture models. Along the way we show how the peridynamic energy is related to the Griffiths fracture energy and how the nonlocal evolution satisfies the principle of least action.

Informal Geometry and Topology Seminar
Questions or comments?

Posted August 27, 2018

1:30 pm - 3:00 pm Lockett 233
Rob Quarles, Louisiana State University

TBA

Geometry and Topology Seminar
Seminar website

Posted October 15, 2018

3:30 pm - 4:30 pm Lockett 233
Andrew McCullough, Georgia Institute of Technology

TBA

Harmonic Analysis Seminar
Abstract and additional information

Posted September 12, 2018

3:30 pm - 4:20 pm Lockett 232
Anton Zeitlin, LSU

TBA

Colloquium
Questions or comments?

Posted October 11, 2018

3:30 pm - 4:20 pm Lockett 232
Scott Ahlgren, University of Illinois at Urbana-Champaign

TBA

Applied Analysis Seminar
Questions or comments?

Posted September 10, 2018

3:30 pm - 4:30 pm Lockett 233
Yuri Antipov, Mathematics Department, LSU

TBA

Computational Mathematics Seminar

Posted September 5, 2018

3:30 pm - 4:30 pm 1034 Digital Media Center
Andrew Gillette, University of Arizona

TBA

Informal Geometry and Topology Seminar
Questions or comments?

Posted August 27, 2018

1:30 pm - 3:00 pm Lockett 233
Nurdin Takenov, Louisiana State University

TBA

Geometry and Topology Seminar
Seminar website

Posted October 15, 2018

3:30 pm - 4:30 pm Lockett 233
Marco Marengon, UCLA

TBA

Applied Analysis Seminar
Questions or comments?

Posted September 12, 2018

3:30 pm - 4:30 pm Lockett 233
Wei Li, LSU

TBA

Algebra and Number Theory Seminar
Questions or comments?

Posted October 1, 2018

3:10 pm - 4:00 pm 232 Lockett
Luca Candelori, Wayne State University

Transcendence of Periods and Endomorphism Algebras of Jacobian Varieties

In this talk I will describe a new method to bound the number of linear relations with algebraic coefficients between the periods of an algebraic curve. As shown by Shiga and Wolfart, these bounds provide information regarding the dimension of the endomorphism algebra of the corresponding Jacobian variety. I will explain how to employ these new bounds to explore two of the many open questions about endomorphism algebras of Jacobians: which Jacobians have complex multiplication, and which Jacobians are totally decomposable.

Applied Analysis Seminar
Questions or comments?

Posted September 12, 2018

3:30 pm - 4:30 pm
Peter Wolenski, LSU Department of Mathematics
Russell B. Long Professor

TBA

Computational Mathematics Seminar

Posted September 7, 2018

3:30 pm - 4:30 pm 1034 Digital Media Center
Ellya Kawecki, Louisiana State University

TBA

Informal Geometry and Topology Seminar
Questions or comments?

Posted August 27, 2018

1:30 pm - 3:00 pm Lockett 233
Natthawut Phanachet, Louisiana State University

TBA

Colloquium
Questions or comments?

Posted September 5, 2018

3:30 pm - 4:20 pm TBD
Ko Honda, UCLA

TBD

Geometry and Topology Seminar
Seminar website

Posted September 7, 2018

3:30 pm - 4:30 pm Lockett 233
Genevieve Walsh, Tufts University

TBA

Algebra and Number Theory Seminar
Questions or comments?

Posted August 20, 2018

Last modified September 10, 2018

Sharon Frechette, College of the Holy Cross

TBA

The talk was rescheduled to be given in Spring and the exact date will be announced later.

Geometry and Topology Seminar
Seminar website

Posted August 28, 2018

3:30 pm - 4:30 pm Lockett 233
Francesco Lin, Princeton University

TBA

Colloquium
Questions or comments?

Posted August 29, 2018

3:30 pm - 4:20 pm TBD
Ivan Angiono, National University of Cordoba

TBD

Colloquium
Questions or comments?

Posted August 22, 2018

Last modified October 11, 2018

Nicolas Andruskiewitsch, National University of Cordoba

TBD

Geometry and Topology Seminar
Seminar website

Posted August 15, 2018

3:30 pm - 4:30 pm Lockett 233
Tye Lidman, North Carolina State University

TBA

Pasquale Porcelli Lecture Series
Special Lecture Series

Posted September 30, 2018

Last modified October 10, 2018

Robert Bryant, Duke University
Fellow, American Academy of Arts and Sciences (2002), Member, National Academy of Sciences (2007), AMS Fellow (2013), AMS President (2015-2017)

tba

Pasquale Porcelli Lecture Series
Special Lecture Series

Posted September 30, 2018

Last modified October 10, 2018

Robert Bryant, Duke University
Fellow, American Academy of Arts and Sciences (2002), Member, National Academy of Sciences (2007), AMS Fellow (2013), AMS President (2015-2017)

tba

Pasquale Porcelli Lecture Series
Special Lecture Series

Posted September 30, 2018

Last modified October 10, 2018

Robert Bryant, Duke University
Fellow, American Academy of Arts and Sciences (2002), Member, National Academy of Sciences (2007), AMS Fellow (2013), AMS President (2015-2017)

tba