- #1
Bobhawke
- 144
- 0
In QFT states in Hilbert space are labelled by particle type and number, momentum, spin and internal quantum numbers. But surely it is equally possible to replace the momentum label by position - why does one never hear of the position basis being used in QFT, and why is there a momentum operator but not a position operator? Why are there only creation and annihalation operators for particles of momentum p, but not for particles of position x?