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November 16, 2022 @ 4:00 pm
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Jiaping Wang, U. Minnesota Abstract: The classical de Rham-Hodge theory implies that each cohomology class of a compact manifold is uniquely represented by a harmonic form, signifying the important role of Laplacian in geometry. The talk aims to explain some results concerning the size and structure of its spectrum. After a brief…
November 09, 2022 @ 4:00 pm
Skye 284
Jiaping Wang, U. Minnesota Abstract: The entropy rate of a stationary sequence of random symbols was introduced by Shannon in his foundational work on information theory in 1948.  In the early 1950s, Kolmogorov and Sinai realized that they could turn this quantity into an isomorphism invariant for measure-preserving…
October 26, 2022 @ 4:00 pm
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Dr. Guofang Wei, UCSB Abstract: It is of general interest to study the difference between Ricci and sectional curvature lower bound. A well known difference is their control on Betti numbers. Recently, joint with J. Pan, we constructed manifolds/singular spaces with nonnegative Ricci curvature which give negative answers to two…
October 19, 2022 @ 4:00 pm
Skye 284
Dr. Zhiqin Lu, UC Irvine Abstract: In this talk, we present the proof of the following theorem: let M be a complete non-compact Riemannian manifold whose curvature goes to zero at infinity, then its essential spectrum of the Laplacian on differential forms is a connected set. In particular, we study the case of form spectrum when…
June 01, 2022 @ 12:00 pm
Zoom
Spatial Ecology & Singularly Perturbed Reaction-Diffusion Equations Prof. Arjen Doelman, Mathematisch Instituut, Lorentz Center; Leiden University, The Netherlands Abstract: Pattern formation in ecological systems is driven by counteracting feedback mechanisms on widely different spatial scales. Moreover, ecosystem models…
May 25, 2022 @ 3:30 pm
Skye 284
M. Susan Montgomery, USC Orthogonal representations: from groups to Hopd algebras to tensor categories Let G be a finite group and V a finite dimensional representation of G over the complex numbers. According to a wonderful theorem of Frobenius and Schur from 1906, there are only three possibilities for V: V has a…
May 18, 2022 @ 12:00 pm
Skye Hall 268
Catherine Searle, Wichita State University Positively curved manifolds are notoriously hard to classify. In the early 90's, based on the observation that the few known examples are all highly symmetric, Karsten Grove proposed his "Symmetry Program" which suggests trying to classify such manifolds with the additional hypothesis of…
May 11, 2022 @ 4:00 pm
May 11th - Skye Hall 284 May 14th - Olmstead 1208
Burton Jones Lecture Information: Bill Goldman, University of Maryland May 11th - Skye Hall 284 Classification of Geometric Structures on Manifolds In 1872 F. Klein, based on ideas of S. Lie, proposed that the classical geometries be understood via the theory of transformation groups and homogeneous spaces. Later in the…
May 06, 2022 @ 9:00 am
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Dr. Kinnari Atit, School of Education, University of California at Riverside   In the U.S., there is a disparity between the number of students pursuing STEM and the number of professionals needed to meet global and economic demands. Of those that do pursue STEM, few are women or individuals from underrepresented minority…
April 27, 2022 @ 4:00 pm
Skye 284
Dr. Rafe Mazzeo, Stanford Gravitational instantons are some of the simplest Riemannian manifolds with special holonomy: they are noncompact, Ricci flat, hyperkähler four-manifolds. There is now a scheme for classifying all of them which is well underway. Many of these spaces arise as moduli spaces of solutions to certain gauge-…
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