Conferences and seminars

Upcoming events

Will talk about "Boundary determining potentials" at the Workshop on microlocal analysis in honor of Nils Dencker's 70 birthday, in Lund, September 16-18, 2025.
Will talk about "Is the index non-zero?" at Analysis and PDE 2025 - Conference on the occasion of Elmar Schrohe's retirement, in Hannover, September 30-October 2, 2025.
Will talk about "A quantitative version of the Helgason conjecture" at the Workshop on Mathematical Physics and Pseudo-Differential Operators in honour of Jean Nourrigat, in Reims, November 5-7, 2025.
Will give a talk at the conference "Interfaces of Spectral Theory, Operator Algebras and Noncommutative Geometry", in honour of Matthias Lesch's 65-th birthday, 29. June - 3. July 2026 in Bonn.
One of the organizers of the Lund-part of the Øresundsseminar, next time in Lund 14/11, 2025.
One of the organizers of the Scandinavian Operator Algebra Workshop (ScAOW), next time in Odense 23-24/9, 2025.

Previous events that I organized

Organized the conference "Hypoellipticity in Lund: a Marcus Wallenberg symposium on sub-Riemannian geometry, spectral asymptotics and noncommutative geometry " at Lund University, June 23-27 2025. Together with Raphaël Ponge.
Organized the conference "Spectral Analysis of Quantum Hamiltonians" at the Institut Mittag-Leffler (IML), 26-30 May 2025, aiming to celebrate Grigori Rozenblum's 75th anniversary and his outstanding contributions to spectral theory. Together with Ari Laptev, Simon Larson, Mikael Persson-Sundqvist, and Alexander Pushnitski.
Organized the NSeaG workshop 2024, dubbed OdenSeaG, at the University of Southern Denmark in Odense, 19-23 August, 2024, together with Are Austad, Jens Kaad, David Kyed and Karen Strung.
Organized a conference on "Noncommutativity in the North" in Gothenburg University and Chalmers, Sweden, together with Sven Raum, and Lyudmila Turowska, March 14-18 2022. Funded by VR, the Marcus Wallenberg Foundation for International Scientific Collaboration and the Wenner-Gren Foundations.
Organized the workshop "Magnitude 2019: Analysis, Category Theory, Applications" with Heiko Gimperlein and Tom Leinster in Edinburgh, July 4-5 2019.
Organized a mini-workshop on "Spectral approaches to fractal geometry" with Alexandr Usachev at the University of Gothenburg and Chalmers University of Technology, September 17-19, 2018.
Organized a workshop on "Secondary and delocalized index invariants" with Robin Deeley, Ryszard Nest and Thomas Schick at the University of Copenhagen, June 11-15, 2018.
Organized the workshop "Analysis, Noncommutative Geometry, and Operator Algebras " with Bram Mesland and Alex Usachev at Chalmers University of Technology/University of Gothenburg, June 12-16, 2017.
Organized a master class on the topic "Sums of self-adjoint operators: Kasparov products and applications" with Olivier Gabriel and Ryszard Nest in Copenhagen, August 22-26, 2016.
Organized a two week program on "Refining C*-algebraic invariants for dynamics using KK-theory" with Adam Rennie and Aidan Sims at MATRIX, Melbourne (Australia), July 18-29, 2016. Talked about "Spectral triples and stuff", July 26.
Organized a mini-workshop on "Operator Spaces and Noncommutative Geometry in Interaction" in Oberwolfach with Simon Brain, Jens Kaad and Bram Mesland February 7-13, 2016.
Organized a workshop on "Methods of noncommutative geometry in analysis and topology" in Hannover jointly with Robin Deeley, Snigdhayan Mahanta and Bram Mesland, October 6-9 2014.

Previous events or talks

2025

Partook in the Institut Henri Poincaré-trimester on Representation Theory & Noncommutative Geometry, Spring 2025.

2024

Gave a seminar on "Heat and isometries on Cuntz-Krieger algebras" at the University of Glasgow, December 10, 2024.
Gave a seminar on "Is the index of sub-Laplacians interesting?" at the University of Southern Denmark, Odense, 24 November, 2024.

2023

Talked about "An index problem for a hypoelliptic operator related to the quaternionic discrete series of Sp(n,1)", seminar for the AIM-research community on Representation Theory & Noncommutative Geometry, September 13, 2023.
Talked about "Counting negative eigenvalues with index theory" at the Hausdorff Kolloquium in Bonn, June 21 2023.
Talked about "Counting negative eigenvalues with index theory" at the yearly meeting of the Swedish Mathematical Society, June 9 2023.
Talked about "Toeplitz operators on Carnot manifolds" at the Swedish NCG&OA-meeting in Stockholm, March 5-6 2023.

2022

Talked about "The index of hypoelliptic operators on (regular) Carnot manifolds" at the Nest Celebration, Ryszard Nest's 70 year birthday conference, University of Copenhagen, June 13-16, 2022.
Talked about "Locality in NCG" at the program on Noncommutative Geometry Along the North Sea, Lorentz Center, Leiden, May 30-June 3, 2022.
Talked about "The index of hypoelliptic operators on (regular) Carnot manifolds" in the Oberseminar Analysis und Theoretische Physik, Leibniz University Hannover, May 17, 2022.
Talked about "Semiclassical analysis of a nonlocal boundary value problem of magnitude" in the Seminar on Analysis, Geometry, and PDEs, University of Lund, April 5, 2022.

2021

Talked about "Exotic examples in Fell algebras" at the Operator algebras web seminar, in the Federal University of Santa Catarina, Florianopolis, Brazil, December 7, 2021.
Talked about "The index of hypoelliptic operators on (regular) Carnot manifolds" at the Danish-Norwegian Operator Algebra meeting in Trondheim, November 25-28, 2021.
Talked about "Bordisms and unbounded KK-theory" in the Glasgow Analysis Seminar, November 11, 2021.
Talked about "A problem of magnitude" at the International Online Workshop on Semiclassical asymptotics and nonlocal elliptic problems, October 20–22, 2021, Moscow, Russia.
Talked about "The Fredholm property of closed realizations of elliptic operators on manifolds with boundary" at the Wollongong OANCG seminar, at the University of Wollongong, 10/6-21.
Talked about "The Fredholm property of closed realizations of elliptic operators on manifolds with boundary" at the C*-algebra seminar at the University of Oslo, 25/5-21.
Talked about "Weyl laws for regular realizations of elliptic operators", Forschungsseminar Differentialgeometrie, University of Potsdam, April 29, 2021.
Talked about "Untwisting spectral triples" in the North Atlantic Noncommutative Geometry Seminar, April 21, 2021.
Talked about "Exotic examples in Fell algebras", in the special session on operator algebras in the British Mathematical Colloquium, April 7, 2021.
Talked about "A problem of magnitude" in the Colloqium at the University of Sheffield, March 24, 2021.
Talked about "Boundary value problems for general elliptic differential operators" in the Seminar on Analysis, Geometry, and PDEs, University of Lund, February 23, 2021.

2020

Talked about "Elliptic and Fredholm realizations of elliptic operators" at the Analysis and Probability seminar, University of Gothenburg and Chalmers University of Technology, October 27, 2020.

2019

Attended the Danish-Norwegian operator algebras meeting "Richard Kadison and his mathematical legacy - A memorial conference" at the University of Copenhagen, 29-30 November 2019
Talked about "Geometric models for the analytic structure group and higher eta invariants" in the Topology seminar at the Westfälische Wilhelms-Universität Münster, May 27-28 2019.
Talked about "The dynamics and (noncommutative) geometry of Smale spaces" in a seminar at Stockholm University, April 24 2019.
Talked about "A problem of magnitude" in the Mathematical Colloquium in Linköping, April 15-16 2019.

2018

Talked about "Constructing KMS-states from spectral triples" at the ESI-program on Bivariant K-theory in Geometry and Physics, ESI, Vienna, November 2018.
Talked about "The magnitude of geometry" at the Öresundsdagarna, in Lund, November 15, 2018.
Talked about "Pairing cyclic theory with Higson-Roe’s surgery exact sequence" at the workshop "Non-commutative Geometry, Index Theory and Mathematical Physics", at Oberwolfach, Germany, July 8-14, 2018.

2017

Talked about "Geometry and magnitude" in the Analysis and Probability Seminar, University of Gothenburg, November 14, 2017
Visited University of Copenhagen and taught a course on Topics in Operator algebras, August-November, 2017.
Attended the masterclass on "Rigidity of C*-algebras associated to dynamics" at the University of Copenhagen, October 16-20, 2017.
Talked about "Poles of magnitude for Euclidean domains" at the masterclass on "Geometric Analysis on Noncompact manifolds" at the University of Copenhagen, October 9-13, 2017.
Attended the masterclass on "Applications of the UCT for C*-algebras" at the University of Copenhagen, October 2-6, 2017.
Attended the conference "Analysis and Topology in Interaction 2017", Cortona, Italy, June 25- July 1, 2017.
Gave a seminar on "Boundaries and/of noncommutative geometry" during a visit to the University of Southern Denmark, Odense, 4-5 May, 2017.
Gave a seminar on "Computing mapping degrees in low regularity" during a visit to the University of Paderborn, 26-28 April, 2017.
Gave a seminar on "Singular traces and Hölder continuous geometry" at NTNU, Trondheim, Norway, 20-21 April, 2017.
Gave seminars on "Geometric K-homology and the assembly map" on 20/3 and "Relative assembly and the Novikov conjecture" on 3/4 during a visit to University of Hawaii, March 17 - April 7, 2017.
Gave a talk about "Spectral triples on Cuntz-Pimsner algebras" in the workshop "KK-theory, Gauge Theory and Topological Phases", at the Lorentz Center, Leiden, the Netherlands, March 6-10, 2017.

2016

Gave a seminar on "Decomposing Cuntz-Pimsner algebras" at NTNU, Trondheim, Norway, 1 December, 2016.
Gave a seminar on "An example of a spectral triple of the usual type in the unusual type III setting" at Linneuniversitetet, Växjö, 16 November, 2016.
Gave a talk about "Unbounded KK-theory and KK-bordisms" at the conference "Noncommutative index theory" during the Simons Semester in the Banach Center, Warzaw, 24-28 October, 2016.
Gave a talk about "Spectral flows along compact obstacles for magnetic Schrödinger operators" at the "Conference on Analysis and Colloquium in Honor of the 60th Birthday of Elmar Schrohe", Leibniz Universität Hannover, October 5 – 7, 2016.
Attended the conference "Groups and Operators" and talked on "Smooth subalgebras and analytic surgery" in Gothenburg, August 15-18, 2016.
Gave a seminar on "Besov spaces and finite summability" in the Oberseminar Analysis und Theoretische Physik, Leibniz University Hannover, June 28, 2016.
Gave a talk about "Detecting regularity using cyclic cocycles and singular traces" at the conference on "Gauge Theory and Noncommutative Geometry" in Nijmegen, April 4-8, 2016.
Gave a talk about "Spectral flows along compact obstacles for magnetic Schrödinger operators" in the Session in Mathematical Physics at the 27th Nordic Congress of Mathematicians, March 19, 2016.
Gave a talk about "Unbounded Kasparov modules for Cuntz-Pimsner algebras" March 14 and attended the Mittag-Leffler program on "Classification of operator algebras: complexity, rigidity, and dynamics", March 14-18, 2016.
Gave a seminar on "Spectral flows along compact obstacles for magnetic Schrödinger operators" in Analysseminariet, Göteborg, February 15 2016.

2015

Gave a talk on "K-theory and topological insulators" in the quantum lunch seminar, Copenhagen, December 2, 2015.
Gave a talk on "Unbounded Kasparov modules on Cuntz-Pimsner algebras", Operator algebra seminar, Copenhagen, September 23, 2015.
Gave a talk on "What I did last summer" in Oberseminar Analysis, Hannover, September 1, 2015.
Gave a talk on "A geometric model for Higson-Roe's analytic surgery group, Part 2", the first part being given by Robin Deeley, at the conference on "Noncommutative methods in Topology and Geometry" in Lyon, June 1-5.
Gave a talk on "Bounded transforms and the KK-bordism group", at the Radboud KK-day, Nijmegen, April 15.
Gave a talk on "The bordism group of unbounded Kasparov cycles" during a visit to Wollongong (Australia) February 23-March 15.
Gave a talk on "Analytic surgery and delocalized Chern characters" in the Oberseminar Global Analysis, Bonn, January 27.
Gave a talk on "The bordism group of unbounded Kasparov cycles" in Nijmegen, January 20, 2015.

2014

Attended "Future directions of noncommutative geometry" at the Hausdorff Institute for Mathematics in Bonn, December 15-18.
Gave two talks on "Non-classical Weyl laws for commutators" at Analysseminariet in Växjö, November 19-20.
Talked about "Finite summability and Cuntz-Krieger algebras, Part I: bounded Fredholm modules" at the workshop "K-homology and graph algebras" in Trieste, August 26-28.
Attended the workshop "Analysis, Geometry and Topology of Positive Scalar Curvature Metrics" in Oberwolfach, August 3-9.
Attended the conference "Analysis and Topology in Interaction 2014", Cortona, Italy, June 16-21.
Visited Edinburgh (Scotland) and talked about "Noncommutative geometry and "dimensions"" June 5- June 12.
Visited Warwick (UK) and talked about "Finite summability on Cuntz-Krieger algebras", May 28- June 5.
Attended the workshop "Hilbert modules and complex geometry" and gave a talk on "Sharp spectral estimates for Hankel operators and related invariants" in Oberwolfach, April 20-26.
Visited Göttingen and gave a seminar on "Sharp spectral estimates on contact manifolds" and an RTG-colloquim on "Finite summability on Cuntz-Krieger algebras", April 2-3.
Visited Clermont-Ferrand (France) and gave a seminar on "Sharp summability of Fredholm modules on contact manifolds", March 23-29.
Gave a seminar on "Sharp spectral estimates for commutators with the Szegö projection" in the Analysseminariet and a colloquim on "The Baum-Connes conjecture, or how to put a circle on your circle so you can circle a circle while circling your circle" in Göteborg, Sweden, March 10-11.
Gave a seminar on "Sharp spectral estimates and Toeplitz operators" in the Analysseminariet in Lund, Sweden, February 18.
Gave a seminar on "Sharper spectral asymptotics of commutators in the Heisenberg calculus", Växjö, Sweden, January 29.

2013

Talked about "Baum-Douglas models for the analytic surgery group", in the "Seminar on Algebra, Geometry and Physics", Max Planck Institute for Mathematics, Bonn, December 3.
RIP-stay 25/8-14/9, 2013, at Oberwolfach with Bram Mesland.
Attended the conference "ISAAC 2013" and talked about "Refining Schatten class properties of Hankel operators", in Krakow, Poland, August 5-10.
Attended the conference "Banach Algebras and Applications" and talked about "Summability in noncommutative geometry", in Gothenburg, Sweden, July 29-August 4.
Visited Erlangen and gave a talk entitled "Computing and regularizing index formulas" at AG Mathematische Physik, 12-14/6.
Attended NCGOA13 with the theme "Index Theory and K-theory", Vanderbilt University, Nashville, USA, May 3-9.
Attended the workshop "Geometric and singular analysis", Potsdam, Germany, March 25-29.

2012

Stayed at the Mittag-Leffler institute for the program on "Hamiltonians in Magnetic Fields", Stockholm 3 September- 15 December.
Gave a talk entitled "Analytic index formulas for Toeplitz operators and Schatten class properties of Hankel operators" at the GAMP-seminar, Copenhagen, November 23.
Gave a talk entitled "Charge deficiencies and Landau levels" at the Mittag-Leffler institute during the program on "Hamiltonians in Magnetic Fields", November 20.
Attended "Summer school in singular analysis" and gave a talk on "Analytic torsion on non-compact spaces", Oldenburg, Germany, September 19-21.
Talked about "Analytic index formulas for Toeplitz operators with Hölder continuous symbols" at the Oberseminar in Analysis in Mainz, Germany, June 20.
Attended workshop on spectral theory in Copenhagen, June 7-8.
Gave a talk on "The Pimsner-Voiculescu sequence for compact Lie groups" at Masters Class in "Quantum Groups" in Copenhagen, March 5-9.
Gave a seminar on "Twisted K-theory through operator-valued pseudo-differential operators" at the Oberseminar "Analysis und Theoretische Physik" in Hannover, January 10.

2011

Attended the workshop on “Stratified spaces: Joining Analysis, Topology and Geometry” at Oberwolfach, Germany, December 11-16.
Talked about “Pimsner-Voiculescu sequence for compact Lie groups“ at the “Danish-Norwegian workshop on operator algebra” at Lysebu, Norway, December 4-7.
Gave a seminar on “The twisted index pairing via operator-valued pseudo-differential operators” in Göttingen November 17.
Attended “Workshop in honor of Kirchberg's 65th birthday” in Copenhagen, Denmark, November 10-13.
Attended the workshop on "Non-commutative geometry" at Oberwolfach, Germany, September 11-16.
Attended the conference on "Analysis and Topology in Interaction 2011" in Cortona, Italy, June 5-11.
Attended NCGOA11 with the theme "Index Theory and Hopf Algebras", Vanderbilt University, Nashville, USA, May 9-18.
Talked about "Topological characteristics of spectral projections" at the conference "Operator Theory and its Applications", Göteborg, Sweden, April 26-29.
Talked about "Index theory on the Fock space" at the Oberseminar "Analysis und Theoretische Physik" in Hannover, Germany, April 12.
Talked about "Projective pseudo-differential operators" at "Geometric and singular analysis" in Potsdam, Germany, March 7-11.
Talked about "Projective pseudo-differential operators" at the HAPDE-seminar at Chalmers/University of Göteborg, February 15.
Talked about "Analytic formulas for topological degree of non-smooth mappings" at “KAUS 2011”, Göteborg, Sweden, January 21-23.

2010

Attended winter school and conference on "Quantization of Singular Spaces" at QGM, Aarhus, Denmark, December 8-17.
Gave a talk on "Analytic formulas for topological degree of non-smooth mappings", “K-Theory, C*-Algebras and Index Theory", Göttingen, Germany, November 1-5.
Gave a talk on "Projective pseudo-differential operators" “AGMF '10” in Tjärnö, Sweden, Oct 25-31.
Attended NestFest in Copenhagen, Denmark, September 2-5.
Attended "Topics in Noncommutative Geometry", winter school in Buenos Aires, July 26 - August 6.
Gave a seminar at the HAPDE-seminar at Chalmers/University of Göteborg with the title "Analytic formulas for topological degree of non-smooth mappings", May 18.

2009

Gave a talk on "Avbildningsgrad av icke-glatta funktioner" at "Svenska matematikersamfundets höstmöte", Göteborg, Sweden, 20-21 November.
Attended Master class on “Classification of C*-algebras” in Copenhagen, Denmark, November 16-27.
Gave a talk on “Charge deficiencies on the Landau levels” at “MP2 October Workshop” in Göteborg, October 23-24.
Attended “Topology, C*-algebras and String Duality”, Texas Christian university, Fort Worth, USA, May 18-22.
Gave a talk on "Rich Dynamics from Crossed Products by Quantum Groups and Twists in Equivariant KK-theory" at the "Non-commutative Geometry and Noncommutative Analysis Seminar" in Lund, March 31.

2008

Attended workshop in "Operator algebraic aspects of quantum groups" in K.U. Leuven, Belgium, November 10 - 12.
Attended Master class in “Homological methods in C*-algebra theory” in Copenhagen, Denmark, November 3-6.
Talk on “Equivariant extensions of *-algebras” at “AGMF '08” in Tartu, Estonia, October 9-11.
Attended "MP2 Summer School 2008: Algebraic and Computational Methods for Strongly Correlated Systems", Chalmers University of Technology and University of Göteborg, August 18-23.
Attended workshop "Operator Structures and Dynamical Systems" at Lorentz center, Leiden, Holland, July 21-25.
Attended "5-th. European Congress of Mathematics", Amsterdam, Holland, July 14-18.
Attended NCGOA08 with the theme “KK-Theory of Operator Algebras and Noncommutative Geometry “, Vanderbilt University, Nashville, USA, May 5-14.
Gave a talk on "Extensions of *-algebras and finitely summable Fredholm modules" at the "Non-commutative Geometry and Noncommutative Analysis Seminar" in Lund, April 25.
Attended Summerschool in “Symbolic dynamics and homeomorphisms of the Cantor set” in Copenhagen, Denmark, June 23-27.
Attended “EMS-weekend”, University of Copenhagen, Denmark, February 29 – March 2.
Gave a talk on “The Riemann-Hilbert problem” at “KAUS 2008”, Stockholm, Sweden, January 18-20.

2007

Gave a talk on "Ickekommutativa differentialstrukturer" at "Svenska matematikersamfundets höstmöte", Växjö, Sweden, 30 November-1 December.
Attended "AGMF'07", Chalmers University of Technology and University of Göteborg, October 11-13.
Attended "Algebraic Methods in Functional Analysis", Chalmers University of Technology and University of Göteborg, June 15-17.

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