The Dirac Equation and QED: Part 2

Second part of the History of the Dirac Equation.
MycroftHomlzsays...

The Dirac equation is a pretty incredible step in physics. Dirac made a huge leap from standard quantum mechanics to modern day field theory.

Dirac tried to rectify quantum mechanics with relativity and in the process proved that negative energy - i.e. antiparticles - had to exist. But there was still a major problem. The Dirac Equation didn't take into account electrodynamics. A great question here is how can macroscopic electrodynamic fields be justified for point particles like fermions and bosons... The answer is that the are understood as spin, torque, and charge. QED was the next big step. But it all started with the elegant and simple dirac equation.

Ornthoronsays...

It's a bit simplistic to say that the conservative physicists like Bohr and Dirac rejected Feynman's diagram because they loved their complex mathematics so much. Fact is that Feynman diagrams are very dumbed down versions of reality, as quantum particles do not move in such simple straight lines as implied by the diagrams. Their power lies in how they are an exquisite intuitive tool for keeping track of how the complex equations should be put together. When you first hear of them there is a danger of mistaking them for being meant as accurate pictures of reality, and I think this was a big part of Bohr and Dirac's misgivings.

Anyhow, when you keep in mind that the diagrams are always to be used in conjuntion with the complex mathematics, they are perhaps the most useful tool ever discovered in physics.

rychansays...

Ugh, the plates need to be micrometers apart for the Casimir effect to be measurable. The guys who made this know better, why do they visualize it so poorly and give everyone an incorrect intuition? Sloppy

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