Dick’s Tricks - Leonard Susskind - 5/11/2018Jun 02, 2021
physics and actually the things I was thinking about then were very, very related to the things I was thinking about so I know first hand it has to do with the proton the proton is a particle so of course, and it is a particle of a class called hadrons, hadrians are not simple elementary particles, they are made of many other particles smaller than themselves that today we call those particles quarks and gluons in 1968 people already knew about quarks maybe it's not so much about the gluons but Fineman didn't want to commit to the stuff the proton was made of so he just called it by a name he made up, he called it partly partly partly as the part of a proton, no one knew much about this. parts, but experiments were going on, experiments were going on at the stanford linear accelerator to bombard the proton with electrons, hit it with electrons and see what comes out or see how the electron behaves after it's born b Bob is the proton and you'll learn something on the structure of the proton there was an army of people calculating how protons and electrons should collide with each other and what they were using what was the technique they were using raise your hand if you think you know oh i'll tell you Fineman diagrams Finding diagrams The problem was that the proton is composed of all these particles that, like liquid helium, bounced and collided with each other intensely in such a way that as the electron passed by. through the proton there were so many collisions of the protons themselves going on that the fineman diagrams became unbelievably complicated a nightmare to try to calculate fineman diagrams well the trick was necessary the trick they both found them happy to say i thought it was too using the special theory of relativity the special theory of relativity you can examine a thing from any frame of reference and if you go to the frame of reference where re the proton is moving very fast the proton is moving to the right with an extremely large speed the protons also move to the right Lorentz and Einstein told us something happens to the image of the proton it squashes into a pancake it collapses into a flat pancake it's called a Lorentz contraction now that in itself wasn't very helpful but it does happen something else is called time dilation, the internal movements, the relative movements of all the Partons and the rise structure slow down, which meant that in such a framework the proton was an object that didn't have much to do and if you study the proton in that framework and collide with an electron, you can think of each of the Partons as frozen, the you hit one at a time and what happens when the electron is the Purple Line hits the proton and it hits the proton if it hits a part and knocks it out that was all the theory there was no more that was all the theory Fineman used to to analyze the experiments that were going on at SLAC and it was extremely effective extremely effective and again he had found the trick that might have embarrassed some people but also got a lot of people excited and made things easier there was another person who was also involved in this I must say i just have to tell you who it was he was a physicist a good friend of ours named Jane pure cane James your cane was also another physicist who knew how NAND knows how to think simple and t He had a very similar image, those are the examples I wanted to show you of how Fineman and the artist and the magician and the physicist thought, they all noticed something very special now, it was all fun and games, it was all
tricks, it was all no, of course . there were deep insights he had fire he was all ego no Fineman had a deep lesson he was trying to teach people he was a teacher among other things he wanted to teach the lesson that jargon gibberish math too precious t Math too abstract generally not They helped you think about the phenomena.
The way of thinking about phenomena. Well, maybe you don't close your eyes, but you think about the phenomena themselves, and then turn them into mathematics. You use the simplest tools you can, whatever. the simplest tools are if you use them you will learn more about physics this was Fineman's legacy I think and it's a legacy I hope will not be lost all young physicists know about Fineman but do you know what he really stood for by simplicity, honesty, and a way of thinking that focused on the phenomena themselves rather than fancy math, by the way, one last thing, someone has already mentioned that Fineman was in fact very philosophical even though he claimed to hate philosophy and, in fact, it was the most philosophical. physicist I've ever met he also said he didn't like math he was the most mathematical physicist he knew but he knew how to use a and he has to use the simplest parts to get the most far reaching conclusions thanks
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