AMA | October 2024

12254.029 - 12275.019 Sean Carroll

So that's where the number 5 comes from in Nima's statement, because in quantum field theory as we currently understand it, in terms of fundamental particles, not composite particles, so you have a nucleus with whatever spin you want, but in fundamental particles, The maximum total spin is two, okay? And the spin, like Nima said, there's only one spin two particle. It's the graviton.