Technically Natural‭

In the context of quantum field theory, why is it impossible for two photons (or other massless bosons like gluons) to collide and produce a single photon? This kind of a process is supposed to be ...

4 answers  ·  posted 1y ago by Technically Natural‭  ·  last activity 4mo ago by matthewsnyder‭

I asked this question on Stack Exchange, and didn't get an answer, but maybe someone here will be able to help. In non-relativistic quantum mechanics, the normalization condition for position eige...

1 answer  ·  posted 4y ago by Technically Natural‭  ·  last activity 4y ago by Derek Elkins‭

I have a question about the discussion of constrained Lagrangian systems in the book Mathematical Aspects of Classical and Celestial Mechanics by Arnold et al. (section 1.2.5). The Lagrangian syst...

1 answer  ·  posted 4y ago by Technically Natural‭  ·  last activity 4y ago by Derek Elkins‭

What should our policy be toward rudeness? I don't think being blunt is a problem, but I do think that calling into question the OP's intelligence is a problem. For example, I don't think there's ...

2 answers  ·  posted 4y ago by Technically Natural‭  ·  last activity 4y ago by Charlie Brumbaugh‭

The Papers Category I don't think the "Papers" category would work well for physics. It would get a lot of spam, and I think it would be much more limited in usefulness than the one on Electrical ...

posted 4y ago by Technically Natural‭

In Srednicki's proof of the spin-statistics theorem for scalar fields ("Quantum Field Theory", section 4), he considers interaction terms, added to the free Hamiltonian, that are Hermitian function...

1 answer  ·  posted 3y ago by Technically Natural‭  ·  last activity 3y ago by Mithrandir24601‭

$x(t)=a\cdot \sin(t\sqrt{k/m})$ is the only solution that satisfies $x(0)=0$. If you then impose $x(c)=0$, you only get solutions for certain values of $k$. These values are the eigenvalues of the ...

posted 1y ago by Technically Natural‭