February 2026
Virtual infinity seminar by Mariem Magdy; arXiv publications; blog post.
Virtual Infinity Seminar by Mariem Magdy
Mariem Magdy from the Perimeter Institute for Theoretical Physics will give a talk “On the conservation of BMS-supertranslation through spatial infinity” on 13 March 2026 at 14:00 UTC. Using Friedrich’s cylinder at spatial infinity to analyze the initial-value problem, Magdy will show that Strominger’s antipodal matching of BMS supertranslation charges generically fails because the charges are ill-defined at the critical sets, but can be restored (and then conserved) by imposing extra regularity on the initial data.
ArXiv Publications
Carrollian Physics and Holography by Romain Ruzziconi.
Transverse expansion of the metric at null infinity by Marc Mars and Gabriel Sánchez-Pérez.
Continued fraction method for high overtone quasinormal modes in effective potentials with discontinuity by Guan-Ru Li, Jodin C. Morey, Wei-Liang Qian, Ramin G. Daghigh, Michael D. Green, Kai Lin, and Rui-Hong Yue.
A Nonlinear Endpoint of Charged Horizon Instabilities by Zachary Gelles and Frans Pretorius.
A geometrical invitation to BMS group theory by Xavier Bekaert, Yannick Herfray, Lea Mele, and Noémie Parrini.
Matching conditions for scattering solutions of scalar wave equations on extremal Reissner-Nordström spacetimes by Yannis Angelopoulos and Istvan Kadar.
The linearised conformal Einstein field equations around a Petrov-type~D spacetime: the conformal Teukolsky equation by Edgar Gasperin, Rodrigo Panosso Macedo, and Justin Feng.
Blog Post
A new blog post by Anıl Zenginoğlu describes a concrete hyperboloidal implementation of time-domain evolution of black-hole perturbations using the Regge–Wheeler–Zerilli (RWZ) framework. Decomposing perturbations into spherical harmonics, the problem becomes solving a wave equation with a potential term.
There’s a public Google Colab notebook linked from the post that can be run from a browser without a local setup.
We’ve added this post to our resources page under the Schwarzschild time-domain materials. If you have code, notebooks, lecture notes, benchmark problems, or other hyperboloidal resources you’re willing to share, please let us know.