Causal Fermion Systems 2025

New Perspectives in Mathematics and Physics

Regensburg, 6-10 October 2025

Aims and Format

In the tradition of the meetings in Blaubeuren (2003 and 2005), Regensburg (2010 and 2014) and Leipzig (2007 and 2018), the conference brings together mathematicians and physicists working in foundations of mathematical physics. This time, the topic will be more focused on mathematical and physical aspects of the Theory of Causal Fermion Systems.

In the past few years, the research has made progress in various directions, both from the mathematical side and concerning the physical applications. The goal of the conference is to present open problems in different physical domains and discuss proposals for addressing them from the perspective of causal fermion systems and other novel approaches. Introductory talks (in the style of a summer school) provide a common basis and set the stage for the later discussions. The core emphasis of the workshop is to foster discussions between different schools of thoughts and to make a connection between fundamental theories and phenomenology.

The topics covered by the conference include the following directions of research:

  • Analysis of the causal action principle: Structure of minimizers, flow by minimizing movements, surface layer integrals describing quasi-local and total mass
  • Non-smooth Lorentzian and quantum geometry: Singular limits of Lorentzian spacetimes, connection to Lorentzian length spaces and synthetic curvature
  • Algebraic structures in causal fermion systems and the standard model: Division algebras, Clifford algebras, octonions
  • Baryogenesis and related topics from cosmology
  • Quantum field theory and beyond: The quantum state and its dynamics, corrections to standard quantum field theory
  • Foundations of quantum theory: The measurement problem, reduction of the wave function, collapse phenomena
  • Quantum information: Entanglement entropy, relative entropy, black hole entropy

Other topics can be suggested by the participants and will be taken up in the parallel discussions.

Scientific Organizers

  • Catalina Curceanu, INFN Frascati
  • Claudio Dappiaggi, Università degli Studi di Pavia
  • Felix Finster, Universität Regensburg
  • Niky Kamran, McGill University, Montréal
  • Antonino Marcianò, Department of Physics, Fudan University & INFN Frascati and Sezione Roma “Tor Vergata”
  • Claudio Paganini, TU Chemnitz and Universität Regensburg
  • Jürgen Tolksdorf, Universität Leipzig

Invited Speakers and Discussants

  • Torsten Asselmeyer-Maluga, DLR Berlin
  • Erik Curiel$^*$, Universität Bonn
  • Siddhant Das, LMU München
  • Dirk Deckert, LMU München
  • Lajos Diosi, Eötvös Loránd University Budapest
  • Wojciech Dybalski, AMU Poznań
  • Michał Eckstein, Uniwersytet Jagielloński, Kraków
  • Astrid Eichhorn, Universität Heidelberg
  • Hans Thomas Elze, Università di Pisa
  • Max Joseph Fahn, Università di Bologna and INFN Bologna
  • Shane Farnsworth, Albert-Einstein-Institut, Golm
  • Jürg Fröhlich, ETH Zürich
  • Franz Gmeineder, Universität Konstanz
  • Niels Gresnigt, Xi’an Jiaotong-Liverpool University, Suzhou
  • Eduardo Guendelman, Ben Gurion University, Be’er Scheva
  • Julia Harz$^*$, Johannes Gutenberg Universität Mainz
  • José M. Isidro, Universidad Politécnica de Valencia
  • Robert Jonsson, Nordita, Stockholm
  • Achim Kempf, University of Waterloo
  • Michael Kiessling, Rutgers University, New Brunswick
  • Margarita Kraus, Johannes Gutenberg Universität Mainz
  • Gandalf Lechner, FAU Erlangen
  • Renate Loll, Radboud University Nijmegen
  • Valter Moretti$^*$, Università di Trento
  • Albert Much, Universität Leipzig
  • Olaf Müller, Humboldt-Universität zu Berlin
  • Simone Murro, Università di Genova
  • Daniele Oriti, Universidad Complutense de Madrid
  • Roman Pasechnik, Lund University
  • Alessandro Pesci, INFN Bologna
  • Peter Pickl$^*$, Universität Tübingen
  • Kristian Piscicchia, Enrico Fermi Research Center, Rome
  • Paula Reichert, LMU München
  • Moritz Reintjes, City University of Hong Kong
  • Vincent Rivasseau, Université Paris Saclay
  • Hanno Sahlmann, FAU Erlangen
  • Clemens Sämann, Universität Wien
  • Miguel Sánchez Caja, Universidad de Granada
  • Tejinder Pal Singh, IUCAA Pune
  • Roland Steinbauer, Universität Wien
  • Stefan Suhr, Ruhr-Universität Bochum
  • Christoph Stephan, Universität Postdam
  • Thomas Thiemann, FAU Erlangen
  • Rainer Verch, Universität Leipzig
  • Emanuele Zappala, Idaho State University

This list will be updated continuously.

$^*$ to be confirmed

Participants

  • Mohammed Alkhateeb, Université de Namur
  • Florian Babisch, Universität Tübingen
  • Marvin Becker, Universität Regensburg
  • Ayush Bidlan, Sardar Vallabhbhai National Institute of Technology, Surat, India
  • Marco van den Beld Serrano, Universität Regensburg
  • Aleix Bou Comas, CSIC – Instituto de Física Fundamental, Madrid
  • Nicola Luigi Bragazzi, LMU München
  • Elias Döhrer, TU Chemnitz
  • Nitesh K. Dubey, Indian Institute of Astrophysics, Bengaluru, India
  • Samira Elghaadya, LPHEMC Hassan II University Casablanca
  • Ebrahim Fasahat, Farhangian University, Tehran
  • Patrick Fischer, Universität Regensburg
  • Sari Ghanem, Beijing Institute of Mathematical Sciences and Applications (BIMSA)
  • Bishnu Gupta Teli, IIT Madras
  • Tim Christoph Heib, Forschungszentrum Jülich und Universität des Saarlandes
  • Bernd Henschenmacher, München
  • Dolantina Hyka, Mediteranean University of Albania, Tirana
  • Sebastian Kindermann, Deggendorf
  • Festim Kodra, Mediterranean University of Albania, Tirana
  • Christoph Krpoun, Universität Regensburg
  • Mahendra Mahagaonkar, India
  • Tomasz Miller, Uniwersytet Jagielloński, Kraków
  • Christoph Minz, SISSA, Trieste
  • Narmin Nasibova, Physics Institute of Ministry of Science and Education, Baku
  • Ragil Brand Ndongmo Tsafack, University of Yaoundé I, Cameroon
  • Pop Nicolina, Politehnica University of Timisoara
  • Carlos Peón Nieto, Universidad Politécnica de Madrid
  • Fabian Nolte, LMU München
  • Julia Osęka, Uniwersytet Jagielloński, Kraków
  • Nick Ormrod, Perimeter Institute, Waterloo
  • Elisabeta Peti, University of Tirana
  • Tales Rick Perche, Nordita, Stockholm
  • Partha Pratim Pradhan, HMMCW Kolkata
  • Martin Pröbstl, Universität Regensburg
  • Martin Rainer, Würburg
  • Aminian Saeid, LMU München
  • Giulio Sanzeni, Ruhr-Universität Bochum
  • Gabriel Schmid, Università di Genova
  • Paul Sternkopf, TU Chemnitz
  • Binh Tran, Leibniz Universität Hannover
  • Jan-Hendrik Treude, Universität Konstanz
  • Andreas Völklein, Universität Regensburg
  • Sahil Yadav, Stockholm University
  • Konstantinos Xenos, University of Patras
  • Yale Yauk, Max-Planck-Institut für Quantenoptik, Garching

This list will be updated continuously.

The conference begins with an introductory school (in the style of a summer school) which introduces the basic notions and concepts. Each topic consists of talks and discussion sessions.

For details see the preliminary program.

MondayTuesdayWednesdayThursdayFriday
morningSchoolTopic 1Topic 2Topic 3Topic 4
12:30-14:00 lunch break
afternoonSchoolTopic 1Topic 2
Kepler museum
City tour
Topic 3Topic 5
eveningOutreach eventDinnerclosing and dinner

The titles of the talks and the topics of the discussion sessions will be announced in due time. Here is a preliminary list of the topics:

  • Topic 1: Spacetime structures: classical and quantum
  • Topic 2: The measurement problem and collapse
  • Topic 3: Quantum field theory, quantum information and beyond
    The afternoon is also the 21st Colloquium “Mathematics and Foundations of Quantum Theory” organized jointly with Dirk Deckert (München),  Peter Pickl (Tübingen) and Wojciech Dybalski (Poznan).
  • Topic 4: Algebraic structures
  • Topic 5: Cosmology and particle physics

Local Information

Local information will be added in due time.

Registration

If you are interested in participating, please register here.

Disclaimer: The above picture of Regensburg is published under the Creative Commons Attribution-Share Alike 3.0 Unported license.