Séminaire Géométrie et applications
organisé par l'équipe Géométrie
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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