Gjesteforelesninger og seminarer - Side 7

Susanne Liese is a postdoctoral researcher at University of Augsburg and part of the "mesoscopic physics of life" group. Her research interests lie in wetting phenomena and membrane dynamics within living systems.

C*-seminar by Roberto Conti (Sapienza Università di Roma)

QOMBINE seminar by Lyudmila Turowska (Chalmers University of Technology and University of Gothenburg)

The derived category of a Fano variety will often have a semiorthogonal decomposition consisting of a sequence of exceptional line bundles and a remaining subcategory, which we will call the Kuznetsov category. The categorical Torelli problem asks whether knowing this category up to exact equivalence is enough to determine the variety up to isomorphism. We will explain how a technique based on a computation of the Hochschild-Serre algebra of the category shows that the answer is yes in many cases, including many weighted hypersurface and a Veronese double cone. This is joint work with Xun Lin and Shizhuo Zhang.

Alessandra R. Brazzale is an Associate Professor of Statistics in the
Department of Statistical Sciences at the University of Padova. Her research interests include parametric likelihood-based inference, higher-order asymptotics, small-sample inference, measurement error, and clustering, with applications spanning the life sciences and astro-physics.

The Section 4 seminar for Autumn 2025 will be held on Fridays at 10.15 am in room 1020.

C*-seminar by Hannes Wendt.

Aldo Solari is Professor of Statistics at the Department of Economics, Ca’ Foscari University of Venice. He holds a degree and Ph.D. in Statistics from the University of Padova and began his academic career at the University of Milano-Bicocca, where he was appointed Professor in 2020. His research centers on the development of statistical methods with applications in biostatistics, genomics, and neuroscience. He has received the Hans van Houwelingen Biometry Award and the Rita Levi Montalcini Award.

Virasoro constraints were recently formulated for moduli of sheaves. The main difference compared to Gromov-Witten theory lies in the linearity of the former which allowed us (B.-Lim-Moreira) to derive sheaf-theoretic constraints from the geometric vertex algebras of Joyce. Our approach applies to more general linear categories. For both sheaves and representations of quivers, I will explain that Virasoro costraints determine primary states of the vertex algebra. This is already sufficient to illustrate the formulation for any linear theory, and it leads to the proof of many results via wall-crossing.

Halim Kusumaatmaja is a Professor at the School of Engineering of the University of Edinburgh. His research group is interested in Multiscale Fluid Mechanics, Soft Matter and Biophysics at the interface between Engineering, Physics, Applied Mathematics, Chemistry, and Biology.

C*-algebra seminar by Haripada Sau (IISER Pune)

Umberto Picchini is interested in Bayesian inference for stochastic modelling, stochastic differential equations, simulator-based methods for inference, applications in biology and medicine. He prefers music pre 2000s. He is a professor in Mathematical Statistics at Dept Mathematical Sciences in Göteborg.

Mattia Gazzola is Associate Professor in the Mechanical Science and Engineering Department at the University of Illinois Urbana-Champaign. His work lies at the interface between mechanics, biology, robotics, and computing.

Sunghwan (Sunny) Jung is a Professor in the Department of Biological and Environmental Engineering at Cornell University. His research interest is to investigate various physics and biology problems emerging from the interaction of biological systems with surrounding environments. His group has integrated mathematical modeling, fluid dynamics, and physical & biological experiments to understand animal behaviors and plant physiology for better functions and performance.

Nordfjordeid Summer School 2025

Prior to his appointment at Victoria University of Wellington in February 2015, Budhi had spent nearly three years at Bank of America Corp. working as a Quant at the level of AVP. He was based mainly in Singapore with direct reporting line to the Head of Quantitative Risk Management Group at BofA HQ in Charlotte, North Carolina. He joined BofA soon after the completion of his PhD in Utrecht in January 2007. His area of research is predominantly on applied probability and stochastic systems towards applications in actuarial science, financial stochastics, optimal stopping and free-boundary problems in theoretical and applied finance, stochastic filtering and smoothing, estimation of Markov chains with covariates dependent transition intensity matrix and their general mixtures, maximum likelihood recursive estimation under incomplete information. He was a visiting scholar, among others, to NYU Stern in April-May 2025, September 2019; Mathematical Institute, University of Copenhagen in February 2020, IEOR Department of Columbia University in May 2014, DAAD visiting scholar to Mathematical Institute of Goethe University of Frankfurt in October-November 2013.

Carolina Euan is a Lecturer in Statistics at the Mathematics and Statistics Department, University of Lancaster. Her research interests include the development of new statistical methods for the analysis of complex time series and Spatio-temporal data. She has experience working with data analysis of ocean wave data, precipitation and drought events, and statistical models for particular matter concentrations.

In this talk, I will present a joint work with Matilde Manzaroli. I will introduce real tori (in the greater generality) as well as real equivariant torus embeddings. Then I will describe the structure of the torus orbits. It will allow us to easily compute the Betti numbers of the real loci of smooth real equivariant torus embeddings, provided that those real loci are compact. Then I will present a canonical "foliation" of their real loci by equivariant embeddings of split tori. I will express a necessary and sufficient condition for this foliation to be given by the fibre of a fibre bundle, and explain how to reduce to this case by performing toric blow-ups.

Dynamic wetting phenomena are present in many everyday situations where liquids interact with surfaces. Understanding and controlling the dynamics of droplets wetting solid surfaces is important in various applications such as boiling and condensation heat transfer, printing and coating, and microfluidic processes. However, modeling their dynamics is not easy because they are multiscale systems in which the advancing or receding of a nanoscale-thick contact line is linked to the behavior of the entire millimeter-scale droplet. In the Thermal Energy Engineering lab (TEEL) at the University of Tokyo, together with the collaborators, we have been investigating the rapid spreading of droplets on solid surfaces as a model system, where the non-equilibrium nature of energy dissipation at the contact line becomes evident. On a partially wetting solid surface, when capillary forces drive droplet spreading, the advancement of the contact line is governed by viscous forces, inertial forces, or contact-line friction. Through experiments, we demonstrated that the dominant physical mechanisms can be switched by tuning droplet properties, surface microstructure [1], or applied electric field [2]. We modeled and reproduced these experiments using a phenomenological parameter that quantifies the contact-line friction coefficient and mapped a phase diagram of dominant physical factors in a dimensionless parameter space. With the knowledge, we realized anisotropic wetting and droplet transport by taking advantage of the fact that the dynamic behavior of droplets can be controlled through solid surfaces when contact line friction is dominant [3,4]. Furthermore, in our recent experiments on droplet oscillation [5] and droplet sliding [6] on solid surfaces functionalized with various self-assembled monolayers (SAMs), we observed that nanoscale surface chemistry and morphology significantly influence contact-line dynamics. This suggests that contact-line friction originates from nanoscale energy dissipation, though the dissipation mechanism remains unclear, and thus, it calls for collaboration with experts with multiscale discipline.

C*-seminar by Ali Miller (Southern University of Denmark).

There are several approaches to studying configuration spaces of points on curves. Examples are the Deligne-Mumford and Hassett spaces or, in the case of points on a projective line, a straightforward GIT construction. Deligne and Mostow further investigated the situation where moduli spaces of weighted points on the projective line have ball quotient models. This leads to a finite set of configuration spaces of ordered or partially ordered points on P^1. In all of these cases, the GIT compactification and the Baily-Borel compactification of the ball quotient are isomorphic. These spaces have natural (partial) desingularizations, namely the Kirwan blow-up and the toroidal compactification. It follows from results of Gallardo-Kerr-Schaffler and Kiem-Moon that, in the case of ordered configurations, the Deligne-Mostow map lifts to an  isomorphism of these compactifications. This can fail for only partially ordered configurations. The main result of this talk is to explain a criterion exactly when these two compactifications coincide. This is also related to the Log Minimal Model Program. This is joint work with Yota Maeda.   

C*-algebra seminar by John Quigg (Arizona State University)