Date
Co-hosted by Kusumi & Goda Units
Date-Time
Wednesday, April 8, 2026 - 11:00 to 12:00
Description
Title: Dynamic nanoscale organization of AMPAR control short and long term synaptic plasticity
Speaker: Prof. Daniel Choquet
Research director at the CNRS
Bordeaux Imaging Center (Director)
Neuroscience Cluster of Excellence, Bordeaux University (Director)
Member of the National Academy
Website: https://www.iins.u-bordeaux.fr/en/teams/56854-dynamic-organization-and-function-of-synapses/
Date
Title: Blow-up rate for the subcritical semilinear heat equation in non-convex domains
Speaker: Dr. Erbol Zhanpeisov (Tohoku University)
Date
QG Seminar
Speaker: Will Horowitz (University of Cape Town)
Title: Hamilton Revisited: The Action Principle for Initial Value Problems
Date
Dr. Leandro Quadrana, Institute of Plant Science. University Paris-Saclay, CNRS, France
Date
Speaker: Mr. Andrew Jensen, Kansas State University
Title: Modulus of Families of Lipschitz Chains with Arbitrary Dimension and Codimension
Abstract:
Recently, Lohvansuu (2023) introduced the p-modulus for families of k-dimensional Lipschitz chains and their dual families of (n-k)-dimensional chains. While he established an upper bound for the duality of these families on Lipschitz cubes, the corresponding lower bound remained an open question. Subsequently, Kangasniemi and Prywes (2025) developed dMod, a related notion of modulus based on differential forms, and successfully established a full duality result. In this talk, I will explore the implications of these developments and discuss related open problems.
Date
Speaker: Professor Pietro Poggi-Corradini, Kansas State University
Title: Discrete p-Modulus and Orthodiagonal Maps
Abstract:
This project is joint work with Nathan Albin, Joan Lind and Pekka Pankka. Our goal is to approximate planar p-capacity (or continuous p-modulus) in topological rectangles using discrete p-modulus defined on an approximating orthodiagonal map. To that end, I will first introduce the planar p-capacity problem we are interested in and then I will give an overview of the theory of p-modulus on finite graphs, describing various notions of duality, and establishing its relation to the discrete p-Laplacian and to non-linear flows.
Date
Speaker: Professor Nathan Albin, Kansas State University
Title: Modulus, Duality, and Families of Objects on Graphs
Abstract:
Given a discrete graph and a family of objects (walks, spanning trees, edge covers, etc.) on the graph, p-modulus provides a mathematical way to quantify the "richness" or "robustness" of that family. Acting as a tunable metric, p-modulus generalizes classical graph metrics—such as shortest path, effective resistance, and minimum cut—to provide a multifaceted view of the graph's topology and geometry. Through the lens of modulus, we can explore a variety of structural properties of the graph. This talk will introduce p-modulus, describe its basic properties, connect it to well-known graph-theoretic quantities, and explore the powerful theory of Fulkerson blocking duality, which connects each family of objects to a natural dual family that provides deep insights into the graph's structural properties.
Date
Speaker: Dr. Sounak Kar, QuTech, TU Delft
Date
Title: Rocks instead of clocks: Bayesian modelling of the fossil record enlightens the diversification and extinction of Hemiptera in deep time
Abstract: Untangling the patterns and drivers behind the diversification and extinction of highly diversified lineages remains a challenge in evolutionary biology. While insect diversification has been widely studied through the “Big Four” insect orders (Coleoptera, Hymenoptera, Lepidoptera, and Diptera), the fifth most diverse order, Hemiptera, has often been overlooked. Hemiptera exhibit a rich fossil record and are highly diverse in present-day ecosystems, with many lineages closely associated with their host plants, making them a crucial group for studying how past ecological shifts—such as mass extinctions and floral turnovers—have influenced insect diversification. This study leverages birth-death models in a Bayesian framework and the fossil record of Hemiptera to estimate their past diversity dynamics. Our results reveal that global changes in flora over time significantly shaped the evolutionary trajectories of Hemiptera. Two major faunal turnovers particularly influenced Hemiptera diversification: (i) the aftermath of the Permo-Triassic mass extinction and (ii) the Angiosperm Terrestrial Revolution. Our analyses suggest that diversification of Hemiptera clades was driven by floristic shifts combined with competitive pressures from overlapping ecological niches. Leveraging the extensive fossil record of Hemiptera allowed us to refine our understanding of diversification patterns across major hemipteran lineages. We also the recently developed Bayesian Brownian Bridge model, which estimates the timing of lineage origin and extinction through fossil-based Bayesian modelling, to provide a temporal framework for the rise and fall of 310 major hemipteran lineages.