Recent content by jonbones

I think I follow you. So, for instance, in the rotating wave approx. where E is the electric field operator in the Heisenberg picture, E = \sumkl(akleklfkl(x)exp(-i\omegat) + a+kle*klf*kl(x)exp(i\omegat)) with <a|E2|a> as the the energy density expectation value, I could choose a state...

I have a question about time dependence in the different pictures of QM. In the Schrödinger Picture, I've read that the time dependence is in the state vector, but one can construct Hamiltonians and other operators that are time dependent in the Schrödinger Picture. For instance, one can...

Nevermind, I found a solution to a similar problem and now I know what I did wrong.

Homework Statement This is a simple problem I thought of and I'm get a nonsensical answer. I'm not sure where I'm going wrong in the calculation. Find the value of <-,p',v';+,q',r'|H|-,p,v;+,q,r> where H is the free-field Dirac Hamiltonian H =...