Quantum Field Theory I - Lecture 15

[@dkovach]

Best lecture I have seen on this topic (vacuum bubble cancellation)

[@arthurrotari8702]

30:36 why is k3 neglected in the second dirac delta?

[@volodymyrtereshchuk9203]

This lecture is not good at all. Sorry but when you give energies imaginary component it IS a problem. Physically it makes zero sense. You did not provide any justification for that whatsoever.