Recent content by enzan

Thank you very much for your comments!

I see. Thank you very much!

Would it be possible to say something correctly about the fundamental principle of photon emission using words that can be understood by high school students? For example, can I say that photon emission is always associated with a change of an electron's "state"? Thank you.

I'm curious about what is the fundamental "principle" of photon emission (creation). Can I safely say that the gauge invariance (or symmetry) is the one for any case, including a decelerated electron (Bremsstrahlung), Compton scattering, and the electron state transition in an atom? Thank you.

What kind of gauge transformation (gauge invariance) is relevant to the electron state transition?

Does that mean that an electron state transition in an atom is described by a phase transformation of the electron field? I'm asking this because I understand that the gauge transformation is a phase transformation.

Is a photon emission from an atom associated with an electron state transition also derived from the local gauge invariance?

I hear that the interaction between a photon and an electron is introduced by the local gauge invariance in the quantum field theory. On the other hand, I know that an decelerated electron emits a photon. Are these two saying the same thing? Or how these two are related?