Title: Resolving Angular Momentum Flux Non-Invariance in 4D Asymptotically Flat Spacetimes
Presenter: Reza Javadi Nejad (New York University)
Time & Date: 14:00 IRST - 06 May 2024
Location: Online - Link
Abstract: The Bondi-Metzner-Sachs group is the asymptotic symmetry group of asymptotically flat spacetimes in 4D. After briefly introducing this group, I will discuss the angular momentum problem. Following an overview of possible solutions, I will present the primary issue that will be addressed in this talk: the non-invariance of the angular momentum flux. The flux of angular momentum is a quantity that is significant from both a theoretical and a numerical perspective. Theoretically, it's important to eliminate ambiguity in the definition of the flux, while in simulations, it has a direct impact on the results. I will conclude by outlining the solution to this problem.