Hi and welcome to the second episode in my series on quantum field theory! In it, I will derive the propagator function first in one spatial dimension, and then in four-dimensional spacetime. In this episode I will focus only on the derivation of this abstract quantity, whereas in the next video we will study its workings more closely. I based this video series on the fantastic textbook "Quantum field theory: A diagrammatic approach" by Ronald Kleiss, which I highly recommend getting yourself if you are interested in studying the subject.
Book: https://www.amazon.com/Quantum-Field-Theory-Diagrammatic-Approach/dp/1108486215
Music: https://soundcloud.com/ahmed-mbk-934601716/peacefully-es-jammy-jams
Made with Manim: https://www.manim.community/