Research Seminar on Analysis, Dynamical Systems and Mathematical Physics

Organizers: David Hasler, Tobias Jäger, Daniel Lenz

The seminar is organized by the research groups for Analysis (Prof. Daniel Lenz, Dr. Marcel Schmidt) de, Ergodic Theory and Dynamical Systems (Prof. Tobias Jäger, Lino Haupt) de and Mathematical Physics (Prof. David Hasler).

The talks usually take place on Thursdays at 12:15 and Fridays at 12:15 (R3517, Ernst-Abbe-Platz 2External link).

To receive email notifications, please subscribe to our mailing list hereExternal link.

This page is maintained by: Lino Haupt.

Upcoming Talks

  1. Asgar Jamneshan, Title: Some structure theorems for characteristic factors of abelian actions
    12:00 ·
    • Talk

    Abstract: tba

    • presence
    • public
  2. Melchior Wirth, Title: tba
    12:00 ·
    • Talk

    Abstract: tba

    • presence
    • public
  3. Stefan Flörchinger, Title: tba
    10:00 ·
    • Talk

    Abstract: tba

    • presence
    • public
  4. Flavia Remo, Title: Non-ignorable missing data under heterogeneity in a meta-analysis with binary outcomes
    12:00 ·
    • Talk

    Abstract: We estimate the pooled treatment effect size in form of the log odds Ratio and heterogeneity variance in a meta-analysis. With missingness and heterogeneity being the most common challenges that hamper data in a meta-analysis, we employ the method of finite mixture modelling combined with multiple imputation to estimate the model parameters using the EM algorithm. At the same time we impute the data that is missing not at random (MNAR) using the augmentation method simultaneously in line with the response mechanism after the work of Lehmann and Schlattmanm (2017). As we are dealing with binary outcomes, we use the standard method of considering a finite mixture of logistic regression models to estimate the regression parameters which translate into log odds as our effect size estimate. We will illustrate our results with a meta-analysis of RCTs comparing haloperidol with placebo in treatment of schizophrenia (see Higgins, White and Wood, 2008).

    • presence
    • public
All events

Current Semester (Winter Term 2024/2025)

14. November 2024 (November 14th)
Jamal Drewlo
Strictly ergodic Toeplitz Zd-subshifts with arbitrary entropy
Contact: Tobias Jäger

21. November 2024 (November 21st)
!!!Exceptionally starting at 12:45!!!
Asgar Jamneshan
Some structure theorems for characteristic factors of abelian actions
Contact: Daniel Lenz

29. November 2024 (November 29th)
Felix Seifert
tba
Contact: Daniel Lenz

05. Dezember 2024 (December 5th)
Melchior Wirth
tba
Contact: Daniel Lenz

12. Dezember 2024 (December 12th)
Stefan Flörchinger
tba
Contact: Daniel Lenz

23. Januar 2025 (January 23rd)
Flavia Remo
Non-ignorable missing data under heterogeneity in a meta-analysis 
with binary outcomes
Contact: Tobias Jäger

Past Semesters

  • Summer Term 2024

    11. April 2024 (April 11th)
    Peter Stollmann (Chemnitz)
    Regularity results for locally integrable subharmonic functions on local Dirichlet spaces
    Contact: Daniel Lenz

    18. April 2024 (April 18th)
    Tobias Weich
    SRB Measures and Ruelle-Taylor resonances for higher
    rank Anosov actions (    abstract)
    Contact: Tobias Jäger

    25. April 2024 (April 25th)
    Mathematisches Kolloquium:
    David Kerr (Münster)
    Suspending the pigeonhole principle: amenability and the Rokhlin lemma (abstract)
    Contact: Tobias Jäger

    3. Mai 2024 (May 3rd)
    Workshop on Mathematical Physics:
    Mathematical Physics in the Heart of Germany IIIExternal link:

    • Marcel Schmidt (Jena): Criticality Theory
    • Jens Hoppe (Braunschweig): Relativistic membranes and the fast non-commutative sharp drop
    • Marcel Griesemer (Stuttgart): Infraparticle scattering in the confined massless Nelson mode
    • Luca Fresta (Bonn): Dynamics of Extended Fermi Gases at High Density
    • Jobst Ziebell (Jena): Wetterich's Equation and Renormalisation

    Contact: David Hasler

    16. Mai 2024 (May 16th)
    Mathematisches Kolloquium: 15:00Uhr (3pm) SR 3517, Ernst-Abbe-Platz 2
    Anna Wienhard
    Beyond hyperbolic geometry (abstract)
    Contact: Tobias Jäger

    23. Mai.2024 (May 23rd)
    Zeyu Kang
    Rational approximations and singular continuous spectrum of dynamical systems
    Contact: Tobias Jäger

    30. Mai 2024 (May 30th)
    Christoph Richard
    Spectrum of weak model sets with Borel windows
    Contact: Daniel Lenz

    6. bis 8. Juni.2024 (June 6th until 8th)
    Workshop "Operator Theoretic Aspects of Ergodic Theory" in Leipzig
    for a program see: https://www.ergodic.de/External link
    Contact: Daniel Lenz

    20.Juni 2024 (June 20th)
    Jena-Leipzig Seminar "Dynamics and Geometry" 
    for a program see: https://www.math.uni-leipzig.de/~eisner/Jena-Leipzig-Seminar.htmlExternal link

    12:15-13:15: Elzbieta KrawczykExternal link (Krakau): Amorphic complexity and tameness of constant length substitution shifts (abstract)
    13:15-14:30: Mittagspause
    14:45-15:45: Héctor Jardón-SánchezExternal link (Leipzig): "The cost of a group action" (abstractExternal link)

    anschließend:
    15:45--16:30 Kaffepause
    Mathematisches Kolloquium: 16:30Uhr (3pm) SR 3517, Ernst-Abbe-Platz 2
    Andreas Knauf: Phase space compactification for n bodies

    Contact: Tobias Jäger

    08. August 2024 (August 8th)
    12pm c.t. in SR 3517, EAP2
    Till Hauser
    About mean equicontinuous factor maps
    Contact: Tobias Jäger

    22. August 2024 (August 22nd)
    Nicolae Strungaru
    Diffraction of weak model sets
    Contact: Daniel Lenz

  • Winter Term 2023/2024

    26.10.2023
    Florentin Münch (Leipzig)
    Log Sobolev inequality and discrete Ricci curvature Abstract
    Contact: Daniel Lenz

    10.11.2023
    Ivan Veselić (Dortmund) 
    Uncertainty relations and parabolic observability for Schroedinger operators with unboundedly growing potentials
    Contact: Daniel Lenz

    16.11.2023
    Tobias Jäger 
    Some remarks on Thue Morse Substitutions
    Contact: Tobias Jäger

    30.11.2023
    Gerhard Keller (Erlangen)
    B-free numbers – a view through the window
    Contact: Tobias Jäger

    11.01.2024
    Jonas Breitenbücher (Jena)
    Topomorphic extensions of equicontinuous dynamical systems
    Contact: Tobias Jäger

    12.01.2024
    Miguel Ballesteros (Mexico-City)
    Stationary Scattering Theory on the Discrete Real Line and Levinson's Theorem
    Contact: David Hasler

    19.01.2024
    Ralph Chill (Dresden)
    Domination of semigroups generated by forms
    Contact: Daniel Lenz

    25.01.2024
    Jaime Gomez Ortiz
    Topo-Isomorphisms of Irregular Toeplitz Subshifts for Residually Finite Groups
    Contact: Tobias Jäger

    26.01.2024
    Christoph Richard (Erlangen) (entfällt wegen Bahnstreik)
    Spectrum of weak model sets with Borel windows
    Contact: Tobias Jäger

    01.02.2024
    Marta Imke (Jena)
    Diskrete harmonische Räume (held in english) abstract
    Contact: Daniel Lenz

    02.02.2024
    Jena-Leipzig Seminar
    Speakers: Philipp Gohlke (Lund) and Hans Crauel (Frankfurt)
    Contact: Daniel Lenz

  • Summer Term 2023

    09.06.2023
    Michael Hinz (Bielefeld)
    A tensor product approach to non-local differential products
    Contact: Martina Zähle/Tobias Jäger

    15.06.2023
    Aihua Fan (Amiens, Wuhan)
    A topological version of Furstenberg-Kesten theorem
    Contact: Tobias Jäger

    22.06.2023
    Tobias Jäger (Jena)
    KAM Theory and the Anosov-Katok method
    Contact: Tobias Jäger

    29.06.2023
    Lino Haupt (Jena) 
    Isomorphic extensions with full fibres over irrational rotations via the Anosov-Katok method
    Contact: Tobias Jäger

    04.07.2023, Paderborn University, Lecture Hall H4
    Workshop 'Mathematical Physics in the Heart of Germany'
    Organizers: Volker Bach, David Hasler, Benjamin Hinrichs
    For more information please go to the workshop homepageExternal link.

    06.07.2023
    Maik Gröger (Krakau/Bremen)
    TBA
    Contact: Tobias Jäger

    Thu., 13.04.2023, 12:00, SR384, Carl-Zeiss-Str. 3
    Daniel Sell (Toruń)
    Finitely many asymptotic classes in Toeplitz subshifts Abstract
    Contact: Daniel Lenz

    Thu., 20.04.2023, 12:00, SR384, Carl-Zeiss-Str. 3
    Daniel Lenz (Jena)
    Diffraction and dynamics on translation bounded measures I

    Thu., 27.04.2023, 12:00, SR384, Carl-Zeiss-Str. 3
    Daniel Lenz (Jena)
    Diffraction and dynamics on translation bounded measures II

    Thu., 04.05.2023, 12:00, SR384, Carl-Zeiss-Str. 3
    Daniel Lenz (Jena)
    Diffraction and dynamics on translation bounded measures III

    11.05.2023
    Henrik Kreidler (Wuppertal)
    The Halmos-von Neuman Theorem I
    Contact: Tobias Jäger

    12.05.2023
    Patrick Hermle (Wuppertal)
    The Halmos-von Neumann Theorem II
    Contact: Tobias Jäger

  • Winter Term 2022/2023

    Thu., 03.11.2022, 12:15, HS4 Abbeanum
    Lior Tenenbaum (Potsdam)
    Periodic approximation of substitution subshifts Abstract
    Contact: Daniel Lenz

    Thu., 10.11.2022, 12:15, HS4 Abbeanum
    Ian Zimmermann (Jena)
    Nonlinear characterizations of stochastic completeness Abstract
    Contact: Daniel Lenz

    Thu., 01.12.2022, 12:00, HS4 Abbeanum
    Melchior Wirth (IST Austria)
    Generators of GNS-symmetric Quantum Markov Semigroups Abstract
    Contact: Marcel Schmidt

    Fri., 02.12.2022, 11:15, R3517, Ernst-Abbe-Platz 2
    Steffen Polzer (Geneva)
    Renewal approach for the energy-momentum relation of the Fröhlich polaron Abstract
    Contact: Benjamin Hinrichs

    Fri., 16.12.2022, 11:15, R3517, Ernst-Abbe-Platz 2
    Oliver Siebert (Tübingen)
    Thermal Area Law for Lattice Bosons Abstract
    Contact: Benjamin Hinrichs

    Thu., 12.01.2023, 12:00, HS4 Abbeanum
    Lino Haupt (Jena)
    Introduction to the Hierarchy of Topological Dynamical Systems with Discrete Spectrum Abstract
    Contact: Tobias Jäger

    Thu., 19.01.2023, 12:00, HS4 Abbeanum
    Christian Rose (Potsdam)
    Characterizing Gaussian upper heat kernel bounds on graphs with unbounded geometry Abstract
    Contact: Marcel Schmidt

    Fri., 20.01.2023, 11:15, R3517, Ernst-Abbe-Platz 2
    Wolfgang Spitzer (Hagen)
    Entanglement entropy of the free Fermi gas Abstract
    Contact: David Hasler

    Thu., 26.01.2023, 12:00, HS4 Abbeanum
    Philipp Kunde (Kraków)
    Non-classifiability of ergodic flows up to time change Abstract
    Contact: Tobias Jäger

    Fri., 03.02.2023, 11:15, R3517, Ernst-Abbe-Platz 2
    Siegfried Beckus (Potsdam)
    Dry Ten Martini Problem for Sturmian Dynamical Systems Abstract
    Contact: Daniel Lenz

    Thu., 09.02.2023, 12:00, HS4 Abbeanum
    Tobias Jäger (Jena)
    Tame minimal systems are regular extensions of group rotations Abstract