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  • Nicolas Stutz

    Geometry of photons of four-dimensional Einstein’s universe

    15 juin 2026 - 14:00Salle de séminaires IRMA

    In this talk we will consider lightlike geodesics in Lorentzian manifolds. We will focus on the model space of conformal Lorentzian geometry, namely the Einstein’s universe. It is known that the space of these geodesics is a contact manifold. In the four-dimensional case, we will present a way to see that it is actually equipped with a Lorentzian CR structure. In this framework, we will partially describe the contact structure thanks to this additional geometric data.
  • Katrin Wehrheim

    TBA

    21 septembre 2026 - 14:00Salle de séminaires IRMA

    TBA