# QFT and particle creation

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ftr

I have two questions

1. which QFT picture are those, Schrodinger, path integral or Heisenberg.

2.In QM the creation/annihilation operators raise and lower energies, but they don't create and destroy particles in the strict sense, let alone the particles having different spins, being scalar one time and bispinor another and vector in another. So why it is said that QFT is a generalization of multi particle QM, and how does QFT generate those different particle and converts them one type to another or others.

Last edited:

Staff Emeritus

I have two questions

1. which QFT picture are those, Schrodinger, path integral or Heisenberg.

2.In QM the creation/annihilation operators raise and lower energies, but they don't create and destroy particles in the strict sense, let alone the particles having different spins, being scalar one time and bispinor another and vector in another. So why it is said that QFT is a generalization of multi particle QM, and how does QFT generate those different particle and converts them one type to another or others.

As to question number 2, I'm not talking about the raising and lowering operators for the simple harmonic oscillator. I'm talking about a mathematical operation that takes you from a space of $n$ particles to a space of $n+1$ particles. In nonrelativistic quantum mechanics, this operator doesn't correspond to anything physical, but it can be used to formulate many-particle theories in a way that is equivalent to the usual theories.

ftr
Thanks for the answer. what about the first question. it looks like the second method is Heisenberg picture , is that correct. what about the first one and in which qft application is used QED or QCD or scattering ...what. Thanks

Staff Emeritus