Benjamin Delarue

Formerly known as Benjamin Küster

Principal Investigator of the project Resonances for non-compact locally symmetric spaces in the SPP 2026 Geometry at Infinity

Member of the Spectral analysis group in the Institute of Mathematics at Paderborn University, Germany

Contact details available here

Google scholar ResearchGate

Photo courtesy of the Oberwolfach Archives, taken during the Workshop Anosov3 which I co-organized

Research interests


No.TitleJournal / arXiv referenceCoauthors
13Locally homogeneous Axiom A flows I: projective Anosov subgroups and exponential mixingPreprint (2024)Daniel Monclair, Andrew Sanders
12Quantum resonances and scattering poles of classical rank one locally symmetric spacesPreprint (2024)Joachim Hilgert
11Singular cohomology of symplectic quotients by circle actions and Kirwan surjectivityPreprint (2023)Maximilian Schmitt, Pablo Ramacher
10A Riemann-Roch formula for singular reductions by circle actionsPreprint (2023)Louis Ioos, Pablo Ramacher
9Resonances and weighted zeta functions for obstacle scattering via smooth modelsAnn. Henri Poincaré 25 (2024), 1607–1656Philipp Schütte, Tobias Weich
8The Ruelle zeta function at zero for nearly hyperbolic 3-manifoldsInvent. Math. 229 (2022), 303–394Mihajlo Cekić, Semyon Dyatlov, Gabriel Paternain
7Asymptotic expansion of generalized Witten integrals for Hamiltonian circle actionsJ. Symplectic Geom. (6) 19 (2021), 1281–1337Pablo Ramacher
6Spectral Theory of the Frame Flow on Hyperbolic 3-ManifoldsAnn. Henri Poincaré 22 (2021), 3565–3617Colin Guillarmou, Charles Hadfield
5Pollicott-Ruelle resonant states and Betti numbersCommun. Math. Phys. 378 (2020), 917–941Tobias Weich
4Quantum-Classical Correspondence on Associated Vector Bundles Over Locally Symmetric SpacesInt. Math. Res. Not. (11) 2021 (2019), 8225–8296Tobias Weich
3On the semiclassical functional calculus for h-dependent functionsAnn. Glob. Anal. Geom. (1) 52 (2017), 57–97
2Quantum ergodicity and symmetry reductionJ. Funct. Anal. (1) 273 (2017), 41-124Pablo Ramacher
1Discontinuity of the Fuglede-Kadison determinant on a group von Neumann algebraCommun. Math. (2) 22 (2014), 141-149


Geometrie für Lehramtsstudierende (Geometry for students of Education), Paderborn University, 2024

Analysis für Informatiker (Analysis for computer scientists), Paderborn University, 2021/22

Symplektische Geometrie und Hamiltonsche Dynamik (Symplectic geometry and Hamiltonian dynamics), Paderborn University, 2017/18

SPP 2026 Geometry at Infinity

My project

SPP 2026 homepage

Selected talks

Brief introduction to Anosov representations, Study group on Patterson-Sullivan Theory, Paderborn 2024

The Ruelle zeta function at zero for nearly hyperbolic 3-manifolds, Online seminar organized by Colin Guillarmou, Nguyen Viet Dang, Frederic Naud, and Gabriel Rivière, January 2021

The frame flow on hyperbolic 3-manifolds, 56th Seminar Sophus Lie, Paderborn, February 2020

Quantum-classical correspondence for resonances on vector bundles, Séminaire Problèmes Spectraux en Physique Mathématique, Institut Henri Poincaré, Paris, January 2019



Selected memories from conferences and workshops

A documentation of the harsh working conditions of a mathematician
  1. Porquerolles, France
    Plage du Langoustier   Georges du Loup   Coastline nearby
  2. MSRI, Berkeley, United States
    Lobby   Sunset behind the Golden Gate   Night view
  3. CIRM, Marseille, France
    Parc national des Calanques   High up on the route to Cassis   Between the rocks
  4. Peyresq, French Alps
    Morning view   Housing   Remains of snow at higher altitude
  5. Oberwolfach, Germany
    Black Forest   Fresh snow