Martijn Caspers


Martijn Caspers
Contact \| Research \| Presentations \| Teaching \| Seminar \| Brief CV

	Upcoming/Recent events 2023-... January 25-January 30, 2026. Noncommutative harmonic analysis and quantum information. Oberwolfach (organizer with Michael Brannan, Fedor Sukochev, Lyudmyla Turowska). November 30-December 5, 2025. Operator Algebraic Quantum Groups: Structure, Dynamics, and Geometry. Banff (organizer with Michael Brannan, Benjamin Anderson-Sackaney, Lyudmyla Turowska, Mateusz Wasilweski). March 31-April 2, 2025. Algebra meets probability in interacting particle systems. EURANDOM Eindhoven. October 28-November 1, 2024. Workshop "Noncommutativity behind the dunes" in Delft (organizer). See here. February 22, 2024. Seminar on Hecke algebras. Amsterdam. December 18-21, 2023. Conference Noncommutative analysis on groups and quantum groups. Besancon. August 21-25, 2023. Conference Noncommutative harmonic analysis and rigidity of operator algebras. Delft (organizer). More info here. June 12-16, 2023. Workshop on Noncommutative harmonic analysis and quantum information. Mittag-Leffler institute in Sweden (organizer with Adam Skalski, Lyudmyla Turowska). More info here. April 19, 2023. Functional Analysis Seminar. Harbin (online). 2022 November 28, 2022. Free probability seminar at virtual Berkely. Title: On the isomorphism class of q-Gaussian W-algebras November 25, 2022. Seminar at virtual Wuhan. Title:* Multi-linear transference theorems. May 30-June 3, 2022. Workshop NSeaG at the Lorentz Center in Leiden. May 18, 2022. Functional analysis seminar virtual UCLA Los Angeles. Title: On the Akemann-Ostrand property for q-Gaussian von Neumann algebras May 2-6, 2022. Workshop Oslo (organizer with Nadia Larsen and Sven Raum). March 28-April 1, 2022. Seminar and research visit at IST Vienna. Title: Quantum Markov Semi-groups: Rigidity and Approximation Properties March 23, 2022. Operator algebra seminar at Virtual Seoul. Title: Local and multilinear noncommutative de Leeuw theorems. 2021 December 13, 2021. Delft-Besancon day at Delft. Title: Riesz transforms on Coxeter groups and strong solidity. November 15-19, 2021. Workshop Quantum Probability and Non-commutative Harmonic Analysis at the Lorentz Center Leiden (organizer with Eric Ricard and Adam Skalski). October 27, 2021. Seminar at IMPAN, Warsaw. Title: Riesz transforms on Coxeter groups and strong solidity. August 20, 2021. Online IWOTA session on Operator Algebras. Title: Riesz transforms in deformation-rigidity theory. August 18, 2021. Online IWOTA session on operator spaces, quantized function theory and noncommutative Lp-spaces. Title: Weak (1,1) type estimates for multi-linear operator integrals March 29-21, 2021. Workshop C-algebras and geometry of groups and semigroups Virtual Oslo* (organizer with Nadia Larsen and Sven Raum). See here (participation upon invitation). Feburary 1, 2021. Online Oselot seminar. Title: Perturbations of commutators and non-commutative Lipschitz functions. Feburary 1, 2021. Seminar at Virtual Berkeley. Title: Riesz transforms on compact quantum groups and strong solidity. January 27, 2021. Seminar at Virtual Saarbrucken. Title: Riesz transforms on compact quantum groups and strong solidity. January 26, 2021. Seminar at workshop on Non-Commutative Geometry along the North Sea at the Virtual North Sea. Title: TBA. January 14, 2021. Seminar Virtual Glasgow. Title: Riesz transforms on compact quantum groups and strong solidity. 2020 December 7, 2020. Quantum group seminar at Virtual Europe, see here. Title: Riesz transforms on compact quantum groups and strong solidity. September, 2021. Seminar at Virtual Besancon. Title: Weak type estimates for multiple operator integrals and the absolute value functions. August 2020. Virtual Noncommutative Analysis Weekly Seminar Virtual Texas, see here. Title: Khintchine inequalities for graph products and Hecke C-algebras. June 3, 2020. Staff colloquium at VU Virtual Amsterdam. Title:* Commutator estimates and non-commutative Lipschitz functions. Only virtual events for a while. January 2020. Lunch colloquium. Delft. Title: Non-commutative Lipschitz functions. 2019 November-December 2019. Visiting UNSW Sydney. November 2019. Zemanek prize ceremony. Warsaw. Title: Non-commutative Lipschitz functions. October 2019. Mini-workshop on operator algebraic quantum groups. Oberwolfach (organizer). May 2019. Workshop mathematics of quantum information theory. Leiden (organizer). April 2019. IMPAN Warsaw. March 2019. Analysis seminar. Texas A & M at College Station . Title: BMO-estimates for commutators and non-commutative Lipschitz functions. March 2019. Brazos seminar. Houston. Title: Gradient forms and strong solidity of free quantum groups. January 2019. Workshop on quantum groups. Tehran. Title: Applications of quantum Markov-semi-groups to von Neumann algebras and commutator estimates. 2018 October 2018. Oslo. Title: Quantum Markov semi-groups, gradients and strong solidity. September 2018. Workshop Non-commutative Analysis and Positivity. Delft. Title: Quantum Markov semi-groups, gradient forms and BMO-spaces. August 2018. Seminar at UNSW Sydney. Title: Gradient forms and strong solidity of free quantum groups July 2018. Workshop on Cuntz-Pimsner cross pollination. Leiden (Lorentz Center). Title: Gradient forms and strong solidity of free quantum groups May 2018. Interactions between Operator Space Theory and Quantum Probability with Applications to Quantum Information. Oberwolfach. Title: Gradient forms and strong solidity of free quantum groups March 2018. Seminar at QuTech, Delft. Title: Gradient forms and strong solidity of free quantum groups 2017 November 2, 2017. Delft. Title: Non-commutative Markov semi-groups: harmonic analysis and approximation. October 20, 2017. Seminar. Leuven. Title: BMO-spaces and Free Araki-Woods factors. June 19, 2017. Colloquium.Delft. Title: Non-commutative harmonic analysis and perturbations of commutators. May 29 - June 2, 2017. Order Structure, Jordan Algebras and Geometry. Leiden (Lorentz Center). May 18- May 22, 2017. Chinese harmonic analysis annual meeting.Wuhan. Title: Weight lifting with ultrapowers. May 15- May 19, 2017. Conference Topological quantum groups and harmonic analysis.Seoul. Title: Weight lifting with ultrapowers. February 20- March 31, 2017. Research visit. Sydney. Title: Absence of Cartan subalgebras for Hecke von Neumann algebras. May 6- 10, 2017. Conference Non-commutativve analysis.Chennai. Title: Weight lifting with ultrapowers. January-February 2017. Research visit. IMPAN Warsaw (with Adam Skalski). Title: Perturbations of commutators and a problem of Nazarov and Peller. 2016 December 5 - December 9, 2016. Waterloo. Title: Absence of Cartan subalgebras for Hecke von Neumann algebras. November 28 - December 2, 2016. UIUC Urbana-Champaign. Title: Absence of Cartan subalgebras for Hecke von Neumann algebras. August 15-26, 2016. Lectures at summer school "Geometry" (aimed at bachelor students who are finishing their second or third year). Utrecht. link. Title: The geometry of discrete groups. July 11-15, 2016. 7ECM satellite conference: Compact Quantum Groups. Greifswald. link. Title: Absence of Cartan subalgebras for Hecke von Neumann algebras. May 9-13, 2016. Conference: Quantum groups: geometry, representations, and beyond. Oslo. Title: Absence of Cartan subalgebras for Hecke von Neumann algebras. March 1-10, 2016. Research visit at IPM. Tehran. Lectures covering approximation properties of operator algebras, graph products and their deformations. February 7-13, 2016. Mini-Workshop: Operator Spaces and Noncommutative Geometry in Interaction. Oberwolfach. Title: Hecke von Neumann algebras, operator spaces and absence of Cartan subalgebras January 25-29, 2016. Winter school on "Banach Methods in Noncommutative Geometry: Isomorphism conjectures and geometry of groups". Link. Münster. (organizer). January 11-15, 2016. Research visit + NCG seminar at IMPAN. Warsaw. Title: Absence of Cartan subalgebras for Hecke von Neumann algebras 2015 October 29-30, 2015. GQT Colloquium. link. Woudschoten. Title: Approximation properties of quantum groups and their operator algebras October 19-20, 2015. ANR meeting. Espaces d'opérateurs, espaces Lp non-commutatifs, probabilités non-commutatives et applications à la théorie quantique de l'information. Paris. Title: Weak type commutator and Lipschitz estimates September, 2015. Nijmegen. Title: Noncommutative De Leeuw theorems August 17-21, 2015. YMCA (Young Mathematicians in C-Algebras). link. Copenhagen. Title: Noncommutative De Leeuw theorems* July 13-17, 2015. Workshop on C-algebras: Geometry and Actions. link. Münster. Title: Non-commutative commutator and Lipschitz estimates* July, 2015. School on Topological Quantum Groups. link. Bedlewo. Lecture series: Locally compact quantum groups. June 14th-June 20th, 2015. Oberwolfach meeting on Noncommutative Geometry. Title: Noncommutative De Leeuw theorems April 16th, 2015. Staffcolloquium. Leiden. Title: Noncommutative De Leeuw theorems March 9th-13th, 2015. Conference on Algebraic and Analytic Aspects of Quantum Lévy Processes. Greifswald. Title: The Haagerup property for arbitrary von Neumann algebras and quantum Dirichlet forms 2014 December 15th-19th, 2014. Conference on Operator Spaces and Quantum Probability. Besancon. Title: Graph products of operator algebras December 11, 2014. Glasgow. Title: Noncommutative De Leeuw theorems December 2nd, 2014. GAGA seminar. Utrecht. Title: The Haagerup property for arbitrary von Neumann algebras November 19, 2014. Seminar. Oslo. Title: The Haagerup property for arbitrary von Neumann algebras Sept 27/28, 2014. Wabash mini-conference Indianapolis. Title: Noncommutative De Leeuw theorems Sept 25, 2014. Analysis seminar UIUC Illinois. Title: The Haagerup property for arbitrary von Neumann algebras Juli 28th-Aug 1st, 2014. Research visit at Paris 7. With Pierre Fima. June, 2014. Conference on Banach methods in Noncommutative Geometry, see here. Wuhan. Title: The Haagerup property for arbitrary von Neumann algebras May, 2014. Workshop Quantum Groups and Operator Spaces. Fields Institute. Toronto. See here. Title: The Haagerup property for arbitrary von Neumann algebras May 7-9, 2014. Workshop Quantum Groups and Operator Algebras (organizer). Münster. March 21st, 2014. Operator Algebra seminar. Leuven. Title: On approximation properties of (quantum) groups and von Neumann algebras. March 6th, 2014. Seminar, University of Warsaw. Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces. March 3rd, 2014. Non-commutative geometry seminar and research visit (with A. Skalski). IMPAN Warsaw. Title: Approximation properties of groups, quantum groups and von Neumann algebras: an overview. February 17-28, 2014. Research visit + seminar, ICMAT (with J. Parcet). Madrid. Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces. January 21st, 2014. Oberseminar Münster. Title: The Haagerup property for arbitrary von Neumann algebras. 2013 Conference. Analysis, geometry and representation theory. Nagoya. Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces. Conference. Operator spaces, harmonic analysis and quantum probability. ICMAT Madrid. Title: The best constants for operator Lipschitz functions on Schatten classes. Workshop. Approximation properties for quantum groups and harmonic analysis on quantum groups. Cergy-Pontoise/Paris. Title: Homological properties of quantum groups. Oberseminar. Westfälische Wilhelms-Universität, Münster. Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces. Seminar. Université Lille 1, Laboratoire P. Painlevé. Title: Quantum groups and noncommutative Lp-spaces. Seminar. Université Paris 6, Institut de Mathématiques de Jussieu. Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces. Seminar. Université Reims, Champagne Ardennes. Title: Quantum groups, Fourier theory and non-commutative Lp-spaces. Seminar. Université Basse Normandie, Caen. Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces. Non-commutative geometry seminar. IMPAN, Warsaw. Title: Quantum groups, Fourier theory and non-commutative Lp-spaces. 2012 Workshop. Arbre de Noël: non-commutative geometry. Metz. Title: Quantum groups and non-commutative Lp-spaces. Workshop. Operator algebras. Seoul. Title: The Lp-Fourier transform on locally compact quantum groups. Journées du GDR. Analyse fonctionnelle, harmonique et probabilités. Paris. Title: The best constants for operator Lipschitz functions on Schatten classes. Workshop. Operator spaces and quantum information theory. Lyon. Title: The best constants for operator Lipschitz functions on Schatten classes. Conference. Quantum groups and non-commutative geometry. Oslo. Title: Quantum groups, Gelfand pairs and non-commutative Lp-spaces. Congress. Dutch mathematical congress. Eindhoven. Title: Fourier analysis on quantum groups. Workshop. Quantum groups. Nijmegen. Title: Locally compact quantum Gelfand pairs. Seminar. Université Blaise Pascal, Clermont-Ferrand. Title: Quantum groups, Fourier theory and non-commutative Lp-spaces. Seminar. Saarlandes Universität, Saarbrücken. Title: Quantum groups, Fourier theory and non-commutative Lp-spaces. Seminar. Chungbuk National University, Cheongju. Title: Gelfand pairs of quantum groups. Seminar on Mathematical Physics. Radboud Universiteit Nijmegen. Title: The best constants for operator Lipschitz functions on Schatten classes. Operator algebra seminar. University of Copenhagen. Title: The Lp-Fourier transform on locally compact quantum groups. Oberseminar. Georg-August Universität, Göttingen. Title: Gelfand pairs of quantum groups. 2011 Seminar. Monash University, Melbourne. Title: The Lp-Fourier transform on locally compact quantum groups. Seminar. Monash University, Melbourne. Title: Gelfand pairs of quantum groups. Seminar. University of New South Wales, Sydney. Title: The Lp-Fourier transform on locally compact quantum groups. Seminar. Technische Universiteit Delft. Title: The Lp-Fourier transform on locally compact quantum groups. 2010 Conference. Quantum groups, free probability and non-commutative geometry. Lumini/Marseille. Title: The Lp-Fourier transform on locally compact quantum groups. Conference. Quantum groups. Clermont-Ferrand. Title: Modular properties of matrix coefficients of corepresentations of a locally compact quantum group. Operator algebra seminar. Katholieke Universiteit, Leuven. Title: Modular properties of matrix coefficients of corepresentations of a locally compact quantum group. PhD Colloquium. Radboud Universiteit Nijmegen. Title: Modular properties of matrix coefficients of corepresentations of a locally compact quantum group.