Schedule

The lectures will all take place in the lecture room H31 in the mathematics building (“Mathematik” on the campus plan). Some of the lectures and discussions will be broadcast via Zoom at this link or

Meeting-ID: 655 9793 5368, Passcode: CFS2025

 

Monday: Introductory school

8:15-9:00: Registration in seminar room M104. Registration is also possible later during the coffee breaks in room M104. You can also contact the conference secretary, Ms Ferstl, in her office M226.

In the introductory school, we will mainly follow the structure in the recent textbook “Causal Fermion Systems: An Introduction to Fundamental Structures, Methods and Applications”. We will cover part of the material in Chapters 2-3, 5-9 and 21. Some basics on relativity and quantum theory will be assumed (you find this preliminary material in Chapter 1 of the book).
 
Introduction to Causal Fermion Systems
9:00-9:45Jan-Hendrik TreudeMathematical Preliminaries (measures, Hilbert spaces, operators, manifolds)Slides, Video
9:45-10:30Claudio PaganiniMotivation in examplesSlides, Video
coffee break
11:00-11:45Felix FinsterGeneral definition of a causal fermion system, the causal action principle, the Euler-Lagrange equations, the linearized field equationsVideo
11:45-12:15Christoph KrpounDiscussion and questions
lunch break
14:00-14:40Robert JonssonInherent structures I (spin spaces, physical wave functions, the kernel of the fermionic projector)Slides, Video
14:45-15:30Sebastian KindermannCorrespondence to classical spacetimesVideo
15:30-16:00Moritz ReintjesDiscussion and questions
coffee break
16:15-16:40Simone MurroInherent structures II (surface layer integrals and conservation laws)Slides, Video
16:45-17:15Patrick FischerBasics on the continuum limitSlides, Video
17:15-18:00Christoph KrpounDiscussion and questions
break
19:00Shane Farnsworth, Antonino Marcianò, Barbara ŠodaOutreach event

Unfortunately, due to technical problems, the first videos of the school were not recorded. Here are links to videos of the online course covering part of the material:

Tuesday: Geometry

Quantum spacetime structures.
Chairs: Wojciech Dybalski, José M. Isidro
9:00-9:20Felix FinsterWelcome and overview of geometric structures of a causal fermion systemSlides, Video
9:20-9:50Renate LollCausal Dynamical Triangulations: Lattice quantum gravity reloadedSlides, Video
10:00-10:30Thomas ThiemannCanonical quantum gravitySlides, Video
coffee break and poster session
11:00-11:30Daniele OritiAn outline of tensorial group field theories and of challenges toward an emergent spacetimeSlides, Video
11:40-12:10Frederic SchullerConstructive gravitySlides, Video
lunch break
Classical spacetime structures. Chair: Stefan Suhr
14:00-14:30Clemens Sämann and Roland SteinbauerNon-smooth spacetimes and Lorentzian length spacesSlides, Video
14:40-15:10Miguel Sánchez CajaCone structures and their applications to fundamental theories and discretizationSlides, Video
coffee break
16:00-16:40M1Moderated plenary discussion
16:45-17:25P1xParallel discussions
17:30-18:10P2xParallel discussions
18:15-18:55P3xParallel discussions

Details on the discussion sessions

  • M1: Moderated discussion
    Topic: “What mathematical structures should a fundamental physical theory be based on?”
    Moderator: Christoph Stephan
  • P1x-P3x:  Parallel discussions
    Moderators: Hans Thomas Elze, Max Joseph Fahn, Franz Gmeineder, Niky Kamran, Christoph Minz, Olaf Müller, Clemens Sämann, Roland Steinbauer, Stefan Suhr, Thomas Thiemann
    P11 “Quantum versus non-smooth classical geometry”: Daniele Oriti, Clemens Sämann
    P12 “The causal action principle as a geometric variational problem”: Franz Gmeineder, Niky Kamran
    P13 “Which experiments are promising to constrain QG”: Thomas Thiemann, Max Joseph Fahn
    P14 “How does Wick roation work in curved spactimes”: Renate Loll
    P21 “Geometric flows”: Franz Gmeineder, Margarita Kraus
    P22 “Singular Lorentzian metrics and regularization”: Moritz Reintjes, Roland Steinbauer
    P23 “Beyond the Einstein equations: Which modifications are well-motivated?”: Eduardo Guendelman
    P24 “What different options do we have for the emergence of classical spacetime”: Christoph Minz,Claudio Paganini
    P31 “Limits of spacetimes”: Niky Kamran, Olaf Müller
    P32 “Cone structures”: Stefan Suhr, Margarita Kraus
    P33 “Which observables are fundamental and which are emergent?”: Claudio Paganini, Daniele Oriti
    P34 “Why does the causal action principle give rise to  three generations of elementary particles?”: Felix Finster, Frederic Schuller

The topics of many parallel discussions have been proposed by the participants online during the conference. The topics are selected on short notice with an online voting system by all participants.

Wednesday: Cosmology and Particle Physics

Chair: Michael Kiessling

09:00-09:30Mairi SakellariadouOpen questions in cosmologySlides, Video
09:40-10:10Eduardo GuendelmanModified measure theoriesSlides, Video
10:20-10:35Marco van den Beld SerranoA baryogenesis mechanism for causal fermion systemsSlides, Video
coffee break and poster session
11:00-11:40P4xParallel discussions
11:45-12:25P5xParallel discussions
lunch break
15:00-17:00Guided city tour with visit of Kepler Museum
19:00-21:00Conference dinner at Brauhaus am Schloss

Details on the discussion sessions

  • P4x-P5x:  Parallel discussions
    Moderators: Eduardo Guendelmann, José Isidro, Michael Kiessling, Antonino Marcianò
    P41 “Mechanisms of baryogenesis”: Felix Finster, Maira Sakellariadou
    P42 “Is causality fundamental?”: Claudio Paganini
    P43“Violations of the Pauli Exclusion Principle and modified measure theories”: Catalina Curceanu, Eduardo Guendelman
    P44 “What are good principles for theory development?”: Michael Kiessling
    P51 “Cosmology as a laboratory of quantum gravity”: Claudio Paganini
    P52 “How do causal fermion systems relate to different approaches to quantum gravity”: Felix Finster, Max Joseph Fahn
    P53 “Is regularization physical?”: José M. Isidro
    P54 “Can fundamental structures of physics / quantum gravity ever be put to an experimental test?”: Catalina Curceanu

Thursday: Quantum information and quantum field theory

Quantum information and entropy. Chairs: M. Eckstein and G. Lechner
09:00-09:30Alessandro PesciSemiclassical thermodynamics of spacetimeSlides, Video
09:40-10:10Albert MuchQuantum entropies in Quantum Field TheorySlides, Video
coffee break and poster session
Friday, 09:00-09:30Achim KempfHow to make spectral geometry workSlides, Video
11:20-11:35Claudio PaganiniCausal fermion systems as a web of spacetime correlationsSlides, Video
11:45-12:25P6xParallel discussions
lunch break
Quantum field theory. Chair: T. Elze
14:00-14:30Rainer VerchSuperluminal local operations in quantum field theory: A ping-pong ball test
Slides, Video
14:40-15:10Astrid EichhornProbing quantum gravity at all scalesSlides, Video
15:15-15:30Moritz ReintjesThe QFT limit of causal fermion systemsSlides, Video
coffee break
16:00-16:40P7xParallel discussions
16:45-17:25P8xParallel discussions
17:30-18:10P9xParallel discussions
18:15-18:55P10xParallel discussions

Details on the discussion sessions

  • P6x-P10x:  Parallel discussions
    Moderators: Hans Thomas Elze, Robert Jonsson, Gandalf Lechner, Simone Murro, Alessandro Pesci, Wojciech Dybalski, Vincent Rivasseau
    P61 “Quantum entropies and modular theory”: Gandalf Lechner, Simone Murro
    P62 “What mathematical/physical techniques can be used across approaches? “Alessandro Pesci
    P63 “The use of artificial inteligence in mathematics and physics research (and vice versa)”: Christoph Stephan, Claudio Paganini
    P64 “What are topological models of particles? Are knots or braids a good starting point?”: Torsten Asselmeyer-Maluga
    P71 “Thermodynamics and spacetime”: Claudio Paganini, Alessandro Pesci
    P72 “How fundamental is the Neumann rule?”: Olaf Müller
    P73 “Which topological property ($T_0$, $T_1$, $T_2$, discrete, totally disconnected, etc…) should posses a quantum spacetime?”: Simone Murro
    P74 “Quantum field theory: Constructive versus perturbative”: Slides by Vincent Rivasseau, Felix Finster
    P81 “On the connection between measure theory and Lorentzian Geometry. “: Michal Eckstein, Tomasz Miller
    P83 “Is there a fundamental Equivalence Principle?”: Alessandro Pesci
    P84 “Does the approach by Fewster and Verch solve the measurement process?”: Felix Finster
    P91 “Causal fermion systems yield deviations from usual event causality in the small and in the large. Can the definiton of causality via eigenvalues be modified to better agree?”: Martin Rainer
    P94 “Quantum fields and causal fermion systems”: Felix Finster, Niky Kamran
    P101 “Cone structures and causal fermion systems”: Felix Finster, Stefan Suhr
    P102 “What is the relation between causal fermion systems and a topology change of the underlying space?”: Torsten Asselmeyer-Maluga, Claudio Paganini

Friday: Quantum foundations, collapse and other approaches

Quantum foundations and collapse. Chairs: C. Curceanu and Robert Jonsson
Thursday, 10:40-11:10Lajos DiosiSpontaneous wave function collapse: grounded in the familiarSlides, Video
09:40-10:10Kristian Piscicchia (online)Searching for signal of quantum collapse through X-ray Emission PatternsSlides, Video
coffee break and poster session
10:30-11:00Jürg Fröhlich (online)Towards a completion of quantum mechanicsSlides, Video
11:10-11:25Felix FinsterCausal fermion systems as an effective collapse theorySlides, Video
11:30-12:10M2Moderated plenary discussion
lunch
14:00-14:40P11xParallel discussions
Other approaches.
14:45-15:15Tejinder P. SinghTrace dynamics, octonions, and unification - from quantum foundations to the E_8  x E_8 octonionic theory of unification –Slides
15:25-15:55Antonino MarcianòThe stochastic gradient flow approach to QCD confinement and mass gap generationSlides, Video
coffee break
16:20-17:00M3Moderated plenary discussion
17:10-17:50P12xParallel discussions
after 17:50closing

Details on the discussion sessions

  • M2: Moderated discussion
    Topic: “Current perspectives on the measurement problem”
    Moderators: Siddhant Das, Paula Reichert
  • M3: Moderated discussion
    Topic: “Challenges for causal fermion systems and other approaches”
    Moderator: Claudio Paganini
  • P11x-P12x:  Parallel discussions
    Moderators: Torsten Asselmeyer-Maluga, Dirk Deckert, Michał Eckstein, Eduardo Guendelmann, José Isidro, Michael Kiessling, Antonino Marcianò, Barbara Šoda, Christoph Stephan
    P111 “A roadmap for the research program of causal fermion systems”: Claudio Paganini, 
    P112 “Can we ‘gravitationalize’ quantum physics ?”: Michael Kiessling
    P113 “What is time?”: Torsten Asselmeyer-Maluga
    P114 “Collapse and heating”: Catalina Curceanu
    P121 “Algebraic structures in the standard model”: José M. Isidro 
    P122 “Non-commutative geometry and the causal action principle”: Michał Eckstein, Felix Finster, Christoph Stephan

Voting system for discussions

Many of the topics of the discussions will be determined by the participants with an online voting system using SLIDO. In order to participate, please click on this link.