In this video, we will talk about the negative energy solutions of the Dirac equation. In particular, we will present two interpretations of those negative energy states, called the Dirac-sea interpretation and the Feynman--Stueckelberg interpretation.

Contents:
00:00 Introduction
01:13 Dirac Sea
02:24 Feynman–Stueckelberg
03:30 Calculating the Helicity

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