/sci/ - Science & Math

We know that both up quarks and up antiquarks have the same mass. However, the ordinary up quark has q = +2/3 e and the antiquark has q = -2/3 e.

Why is there the distinction there that the positively charged up quark is the ordinary particle while the negatively charged one is the antiparticle? This question can be extended to all quarks (with the signs switched for down, strange, and bottom) too.

Is there something else that makes a particle antimatter other than electric charge?

I have been reading a lot about quantum and particle physics and whatnot, and one thing I keep noticing are the models. Theres the standard model, then theres string theory, then theres supersymmetry! Then theres the higgs boson, which interferes with all of them! I don't understand any of it. What are the standard, string, and supersymmetric models? How are they different from each other?

hey /sci/, just some undergraduate musings here...

from what little I know of dark matter, it can exert gravitational pull (has mass), but has no electromagnetic interactions (no charge). this seems a bit too simple and I'm sure it's been disproven, but could someone explain to me why dark matter couldn't be diffuse interstellar clouds of neutrons?

>>1409287 here

forgot my picture

>>1019906