AMA | October 2024

12410.385 - 12432.026 Sean Carroll

So that's one constraint on what you can do. Another constraint is that you don't want to have particles moving faster than the speed of light, right? And that might sound easy to do, but in fact if you just start writing down random quantum field theories with high spin particles, the fact that your spin is so large means that every kind of particle comes with many different components.