Does anyone know the Lagrangian for the propagation of light in curved spacetime? I'm disappointed to discover that I don't actually know how to compute the action for a given null curve.
I've long been planning to create an interface which provides an overview of my data. I'm not sure how to get started so I'm looking for advice.
I'm a numerical relativist and I do a lot of simulations. I organize these by running in directories which I label by date. These directories...