Check out our latest paper! Short thread below. How to "fix the BMS frame" of the gravitational-wave predictions co… https://t.co/eQCZgKRWmf
Physicists frequently analyze a physical situation starting at some moment in time, and ignore what happened before that moment in time. To do this, however, they need to understand what was happening at that initial moment. That is, they need Initial Data. This is very similar to using Boundaries, which requires having Boundary Conditions.