Hi everybody, I'm writing my QFT exam tomorrow and I know that there will be a self energy calculation. Since I am not that familiar with it, because we didn't do any self energy calculations in the exercises so far, I would like to do some simple calculations. I think the electron self energy, the vacuum polarization and the vertex correction are too difficult for an exam. I already found the easiest example for Phi^3 theory and I think something like this could come in the exam: -----( )---------- (1 Bubble) The calculation was not too difficult. Do you guys know any other simple selfenergy calculation? I would like to be prepared as good as possible for tomorrow :) Thank you!