Check out our latest paper! Short thread below. How to "fix the BMS frame" of the gravitational-wave predictions co… https://t.co/eQCZgKRWmf
A particle which is not made up of smaller particles. The neutron and proton are both made up of smaller particles — called quarks. On the other hand, quarks are not believed to be made of anything smaller. Like quarks, electrons and photons are also believed to be elementary particles.