How Einstein Uncovered the Path a Particle Traces Through Spacetime!
This video is part 3 of the series I've been sharing with you about the principle of least action. The first video was about a particle in Newtonian mechanics, and the second was about a particle in special relativity.
In this video, we'll learn about the principle of least action for a particle in general relativity. The action is just the length of the particle's worldline through spacetime, and it picks the straightest and shortest path that it can.