Given a solution of the Einstein equations a fundamental question is whether one can extend the solution or whether the solution is maximal. If the solution is inextendible in a certain regularity class due to the geometry becoming singular, a further question is whether the strength of the singularity is such that it terminates classical time-evolution.
In this talk we give an overview of low-regularity inextendibility results for Lorentzian manifolds and then focus on recent results showing the locally Lipschitz inextendibility of FLRW models with particle horizons and spherically symmetric weak null singularities. The latter in particular apply to the spherically symmetric spacetimes constructed by Luk and Oh, improving their C^2-formulation of strong cosmic censorship to a locally Lipschitz formulation.
The seminar will be held over Zoom. Register in advance for this meeting using the following link: https://utoronto.zoom.us/meeting/register/tJcqf-Cqrj4oH9X0X4db3kOgnEhUVGy5AUwe After registering, you will receive a confirmation email containing information about joining the meeting.