Analysis and probability seminar
Analysis and probability seminar
The seminar is joint for the division of Analysis and Probability within the Department of Mathematics at Chalmers / GU. Its main themes include Probability Theory, Mathematical Physics, Operator Algebras, and Harmonic and Functional Analysis.
Should you have any questions or suggestions, feel free to email one of the organizers Malin Palö Forsström (palo 'at' chalmers.se), Simon Larson (larsons 'at' chalmers.se) or Spyros Petrakos (petrakos 'at' chalmers.se).
Instructions for invited speakers:
The seminar caters to a broad audience in analysis and probability. We thus urge speakers to make the first 10-15 minutes of the talk very introductory, aimed at first-year graduate students. The total time for the seminar is 50 minutes plus 10 minutes for questions.
2026-05-05 at 13:15, MVL 14
Vern Paulsen (University of Waterloo)
Title: Exactness and Lifting Results via Operator System Methods
Abstract: We use an operator system approach to give new proofs of Wasserman's result that the full C*-algebras of free groups are non-exact and of Rosenberg's result that the reduced group C*-algebras of non-amenable groups are not quasi-diagonal. This approach also gives distance estimates between certain matrix convex sets and their various relaxations. Based on joint work with K. Davidson and M. Rahaman.
2026-05-12 at 13:15, MVL14
Evgenios Kakariadis (University of Athens)
Title: Symmetrisation products and systems of operators
Abstract: Operator systems have a central role in the theory of operator algebras. Lately, the community has been actively considering selfadjoint operator subspaces, but which need not be unital. Those appear naturally, for example when comparing operator systems up to their stabilisations as in the work of Connes and van Suijlekom. The absence of a unit disrupts the link between the norm and the matrix order structure, creating significant difficulties in obtaining even fundamental theorems like the celebrated Arveson's Extension Theorem.
In the first part of this talk I will present how such problems are resolved by working with morphisms that their unitisation (in the sense of Werner) is completely isometric. Furthermore I will provide (old and new) characterisations of such maps in terms of extensions and gauge isometries in the sense of Russell), with a focus on approximately positively generated or singly generated spaces.
Stabilisations can be seen as an incarnation of Morita equivalence for operator systems, similar to Rieffel's notion for C*-algebras introduced in the 60s. In the second part of this talk I will give equivalent characterizations via Morita contexts, bihomomoprhisms and a symmetrisation product, while I will highlight properties that are invariant. Time permitted I will provide applications to rigid systems, function systems and non-commutative graphs.
This talk is based on joint works with Alexandros Chatzinikolaou, Joseph Dessi, George Eleftherakis, Se-Jin Kim, Apollonas Paraskevas, and Ivan Todorov.
2026-05-19 at 13:15, MVL14
Levi Haunschmid-Sibitz (KTH)
2026-05-26 at 13:15, MVL14
Matteo Pagliero (SDU)
2026-05-28 at 10:30, MVL15 (Note different time and place)
Jean Lagacé (King’s College London).
2026-06-02 at 13:15, MVL14
Mizanur Rahaman (Chalmers/GU)
2026-06-09 at 13:15, MVL14
Bernt Wennberg (Chalmers/GU)
2026-12-15 at 13:15, MVL14
Frank den Hollander
2026-01-20: Simon Leo Myerson (Chalmers), Bounds for spectral projectors on tori
2026-02-17: Corentin Correia (IMJ-PRG, France), Odomutants and flexibility results for quantitative orbit equivalence
2026-02-24: Peter Sjögren,(Chalmers/GU), On the maximal operator in a nonsymmetric inverse Gaussian setting
2026-03-03: David Kerr (Münster), Stable rank one in nonnuclear crossed products
2026-03-10: Jeffrey E. Steif (Chalmers/GU), What is the Gaussian Free Field?
2026-03-17: Lukas Schoug (KTH), A first passage metric of the Gaussian free field
2026-03-24: Mikael Persson Sundqvist (Lund), Magnetic Schrödinger operators in the unit disk
2026-03-31: Marco Michetti (Chalmers/GU), Structure of the Robin Harmonic Measure on Rough Domains
2026-04-07: Johan Wästlund (Chalmers/GU), Moment generating functions in combinatorial optimization
2026-04-14: Irene Ayuso Ventura (Durham), The critical random cluster model on Bienaymé–Galton–Watson trees
2026-04-21: Antonio Peralta (Granada), The metric fingerprints of a (not necessarily associative) Banach algebra
2026-04-27: Klara Zimmerman (FOI), A new algorithm for Electrical Impedance Tomography in two dimensions
2026-04-28: Magnus Goffeng (Lund), Poisson transforms and the Baum-Connes conjecture
2025-01-21: Ulrik Thinggaard Hansen (Copenhagen), Universality of the Large-Scale Geometry for Planar Critical Random-Cluster Models
2025-01-28: Peter Sjögren (Chalmers/GU), Variational inequalities for the Ornstein--Uhlenbeck semigroup in higher dimensions
2025-02-11: Emilie Elkiær (Oslo), Symmetrized pseudofunction algebras from L^p-representations and amenability of locally compact groups
2025-02-18: Robin van Haastrecht (Chalmers/GU), Wehrl-type inequalities for the holomorphic discrete series
2025-02-25: Sascha Troscheit (Uppsala), Fractal percolation, dimensions, connected components, and other recent progress
2025-03-04: Mikhail Menshikov (Durham, UK), Dynamics of finite and semi-infinite particle systems with exclusion interaction
2025-03-11: Fredrik Viklund (KTH) -- joint AP and KASS seminar, Free energy of planar Coulomb gases
2025-03-18: David Jekel (Copenhagen), Upgraded free independence relations for random unitaries
2025-03-25: Sanaz Pooya (Potsdam), K-Theory of higher Kazhdan projections and applications to delocalised L2-Betti numbers
2025-04-22: Rostyslav Kozhan (Uppsala), Multiple orthogonal polynomials on the unit circle and the Hermite-Pade approximation
2025-04-29: Kristin Courtney (SDU, Denmark), At the limit of matrix algebras
2025-05-06: Lyudmila Turowska (Chalmers/GU), Self-testing: an operator algebraic approach
2025-05-13: Dragu Atanasiu (Borås), The moment problem on compact sets of characters
2025-09-09: Alejandro Rodriguez Sponheimer (Lund), Dynamical Strong Borel--Cantelli Lemmas for Recurrence
2025-09-16: Martino Lupini (Bologna, Italy), Phantom invariants in analysis
2025-09-23: Ryan L. Acosta Babb (Warwick, UK), Lp continuity of spectral projections for the Laplacian on Euclidean domains
2025-09-30: Ebrahim Samei (Saskatchewan, Canada), A harmonic analysis approach to random walks and group actions
2025-10-07: I-Kun Chen (National Taiwan University, Taiwan), On the existence and regularity of weakly nonlinear stationary Boltzmann equations: a Fredholm alternative approach
2025-10-14: Sebastian Bechtel (Université Paris-Saclay), Well-posedness of non-linear parabolic equations with rough coefficients and data
2025-10-16: Erik Lindgren (KTH), Extremals for Poincaré–Sobolev inequalities
2025-10-21: Moritz Schauer (Chalmers/GU), The categorical semantics of conditioning Markov models
2025-10-28: Bastien Dubail (KTH), Cutoff for mixtures of permuted Markov chains
2025-11-11: Tatiana Shulman (Chalmers/GU), Cones and asymptotic liftings
2025-11-18: Gábor Szabó (KU Leuven), The uniqueness theorem for Kasparov theory
2025-12-02: Spyros Petrakos (GU/Chalmers), Quantitative orbit equivalence for ℤ-odometers
2025-12-08: Eero Saksman (University of Helsinki), Some random geometry in Riemann zeta
2025-12-16: Stefano Almi (Naples Federico II)
2025-12-16: André Laestadius (Oslo Metropolitan)
2025-12-16: Bartosz Malman (Mälardalen)
2024-01-23: Ulrik Enstad (Oslo), Classifiability of C*-algebras associated with point sets
2024-01-30: Pieter Spaas (Copenhagen): Local Hilbert-Schmidt stability
2024-02-07: Lashi Bandara (Deakin University, Melbourne), Trace, Regularity, Fredholmness: the story of non-compact boundary for first-order elliptic operators
2024-02-13: Johan Wästlund (Chalmers/GU), Billiards, Checkers, and Quadratic Reciprocity
2024-02-20: Shrish Parmeshwar (Warwick, UK), Global-in-time Vortex Configurations for the 2D Euler Equations
2024-02-27: Eduard Vilalta (Chalmers/GU), Nowhere scattered multiplier algebras
2024-03-05: Are Austad (Syddansk Universitet, Odense), Ideal intersection properties for group-graded Banach *-algebras
2024-03-12: Peter Sjögren (Chalmers/GU), Variation inequalities for the Ornstein-Uhlenbeck semigroup
2024-03-14: Erik Duse (KTH), Generic ill-posedness of the energy-momentum equations in the vectorial calculus of variations
2024-03-20: Tobias Weich (Paderborn), Polyhedral bounds on the joint spectrum on higher rank locally symmetric spaces
2024-04-02: Malin Palö Forsström (Chalmers/GU). Poisson coverage processes
2024-04-10: David Rule (Linköping), Multilinear and Weighted Estimates for Oscillatory Integral Operators
2024-04-16: Eric Ling (Copenhagen), Rigidity aspects of Penrose's singularity theorem
2024-04-23: Håkan Andreasson (Chalmers/GU), Existence of a minimizer to the particle number-Casimir functional for the Einstein-Vlasov system
2024-04-30: Robin van Haastrecht (Chalmers/GU), Limit formulas for the trace of the functional calculus of quantum channels for $SU(2)$
2024-05-07: Søren Fournais (Copenhagen), On the ground state energy of the dilute Bose gas
2024-05-21: Hedong Hou (Laboratoire de Mathématiques d'Orsay, Université Paris-Saclay), Well-posedness for parabolic Cauchy problems with distributional initial data
2024-05-28: Wojciech Szymanski (Syddansk Universitet), Cuntz algebras and the Thompson groups
2024-05-28: Frank Thuijsman (Maastricht University), Game Theory, from John von Neumann to Treatment of Cancer
2024-05-29: Alessandro Bravetti (Universidad Nacional Autónoma de México), From Fisher to Fisher: using Fisher information to understand Fisher's Fundamental Theorem of Natural Selection
2024-06-11: Jorge Castillejos (UNAM, Cuernavaca)
2024-06-11: Mizanur Rahaman (ENS, Lyon), Quantum Stein's Lemma and subalgebra entropies
2024-06-18: Leif Arkeryd (Chalmers/GU), On Boltzmann type equations with discrete velocities
2024-08-27: Khalid Koufany (Université de Lorraine, Nancy, France), A characterization of the $L^2$-range of the generalized spectral projections related to the Hodge-de Rham Laplacian
2024-09-10: Hannes Thiel (Chalmers/GU), Pure C*-algebras
2024-09-17: Cécile Mailler (Bath, UK), A two-table theorem for a disordered version of the Chinese restaurant process (CRP)
2024-09-19: Andreas Rosén (Chalmers/GU), Coerciveness and Morrey inequalities for elliptic operators with natural boundary conditions via Weitzenböck identities
2024-09-24: Jonathan Breuer (Hebrew University of Jerusalem / Mittag-Leffler), Towards a Floquet Theory for Periodic Jacobi Matrices on Trees
2024-10-15: Tomas Berggren (KTH), Crystallization of the Aztec diamond
2024-10-22: Emilie Elkiær (Oslo), Symmetrized pseudofunction algebras from L^p-representations and amenability of locally compact groups
2024-11-05: Alexander Müller-Hermes (Oslo), Monogamy of entanglement in quantum theory and beyond
2024-11-07: Erik Broman (Chalmers/GU), Phase transitions of semi-scale invariant Poissonian random fractals
2024-11-12: Alistair Miller (SDU, Denmark), Homology and K-theory for self-similar group actions
2024-11-19: Terry Soo (UCL, UK), Some variants of the Sinai factor theorem
2024-11-20: Fatma Ayça Cetinkaya (Mersin University, Turkey), NSBF Method for an Inverse Sturm--Liouville Problem
2024-11-26: Mathias Palmstrøm (NTNU, Norway), Rigidity of Lp-operator algebras associated with ample groupoids
2024-12-03: Damian Osajda (Copenhagen), Burnside groups and Kazhdan’s property (T)
2024-12-10: Kaj Nyström (Uppsala), Caloric Measure and Parabolic Uniform Rectifiability
2024-12-17: Lorents Landgren (Chalmers/GU), Identifying most reliable graphs
2024-12-20: Lashi Bandara (Deakin University), Geometric singularities and Hodge theory