Recent content by kilokhan

Never mind, I found the appropriate relation, \partial_{\mu}x^{\nu}=g^{\mu \nu} But I'm not entirely sure why this is true. If someone could explain that would be great.

Is there a commutation relation between x^{\mu} and \partial^{\nu} if you treat them as operators? I think I will need that to prove this [$J J^{\mu \nu}, J^{\rho \sigma}] = i (g^{\nu \rho} J^{\mu \sigma} - g^{\mu \rho} J^{\nu \sigma} - g^{\nu \sigma} J^{\mu \rho} + g^{\mu \sigma} J^{\nu...

say I have a QED vertex with an anti-fermion (p) going in and a fermion (q) and photon(k) coming out. Since the momentum flow is supposed to be along the direction of particle number flow, wouldn't this mean that the delta function at that vertex would be \delta(-p-q-k) ? that doesn't seem to...

what about the usual thought experiment used to explain spin, with magnetic fields? do we expect neutrinos to be deflected?

If a neutrino is unaffected by EM and strong forces, and only interacts weakly, how is it possible to measure its spin? I don't mean measurement in a practical sense, as in looking at pion decay.. but how it could be measured in principle. I guess what I mean is are there any physical phenomena...