Difference between revisions of "20: Sir Roger Penrose - Plotting the Twist of Einstein’s Legacy"
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20: Sir Roger Penrose - Plotting the Twist of Einstein’s Legacy (view source)
Revision as of 03:53, 14 March 2020
, 03:53, 14 March 2020no edit summary
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other he got made sure they did meet | other he got made sure they did meet | ||
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each other in one case it was Stephen | |||
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Hawking but Dennis was actually yeah | |||
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when you mentioned Dirac Dennis was | |||
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actually the last graduate with at the | |||
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time he was the only graduate student of | |||
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directs is that right yes then this was | |||
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Dirac was famously sort of difficult I | |||
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think that you know in recent years this | |||
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book came out of grammar mail of the | |||
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strangest man that puts directs | |||
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bizarreness he was difficult to get to | |||
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know but there's a bit of an irony here | |||
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I mean certainly he was hard for | |||
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physicists and so on to get to know him | |||
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now there were two people and actually | |||
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maybe I could just say one thing to our | |||
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listeners yes | |||
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in my estimation if not yours Dirac | |||
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would be neck-and-neck with Einstein for | |||
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the greatest of 20th century physicists | |||
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I think I wouldn't be far off that that | |||
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description for some reason his press | |||
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wasn't nearly as good maybe because of | |||
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his hair I don't know well he didn't | |||
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talk much this is one of the problems no | |||
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I agree I think he was I mean you think | |||
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about all we quantum mechanics people | |||
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who developed that amazing subject and | |||
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Dirac was really the one who put put it | |||
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all in order and so on well is is is and | |||
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this gets to a very odd issue which is | |||
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that you have wielded taste and beauty | |||
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as a weapon your entire life your | |||
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drawings are among the most compelling I | |||
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remember the first time what are one of | |||
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the things I've done using our friend | |||
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Joe Rogan's program is to push out | |||
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discussion of the hopf fibration because | |||
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it's an it's the only non-trivial | |||
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principal bundle that can be visual | |||
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scene and since the world seems to be | |||
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about principle bundles it's a bit odd | |||
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that the general population doesn't know | |||
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that stuff of which we are yes well they | |||
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the hopf fibration or the Clifford | |||
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parallels was instrumental in the | |||
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subject of Trista theory well but the | |||
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first time I ever saw a diagram it was | |||
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somebody reproducing a diagram they had | |||
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seen of yours and so the way in which | |||
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you have used art and sketches yeah it | |||
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was drawn by hand largely I mean they | |||
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were adding some circles involved which | |||
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I use a compass for but basically I | |||
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draped my hand there were two versions | |||
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of it the first one was more I sort of | |||
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thread you die first one was had more | |||
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circles in it and I thought I draw | |||
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there's more simply in the second | |||
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version but actually I had three | |||
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versions the third version is in the | |||
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road to reality but I'm not sure it's | |||
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best I think the second version perhaps | |||
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is the best so so Dirac getting back to | |||
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it had this elegance of mind yeah it was | |||
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unrelenting yes and he famously brought | |||
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in these bizarre objects with which some | |||
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of us are obsessed others of us don't | |||
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understand the obsession called spinners | |||
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which is sort of her a prerequisite to | |||
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getting to twister theory which you've | |||
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popularized well I I went to the UC | |||
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Dirac gave a course of lectures in | |||
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quantum mechanics and the first course | |||
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was sort of basic quantum mechanics and | |||
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the second course was on quantum field | |||
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theory but also spinners and there's an | |||
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interesting story about that which I | |||
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don't know the answer to in the second | |||
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course he deviated from his normal | |||
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course of lectures now I understood when | |||
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I talked to Graham family who wrote this | |||
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biography of Dirac I understood from | |||
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grand family that when I described that | |||
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the | |||
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deviated from his normal course to give | |||
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two or three lectures on two component | |||
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spinners which for me were absolutely | |||
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what I needed you see I'd learned from | |||
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my work on algebraic geometry we changed | |||
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that by trying to understand tensor | |||
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systems as abstract systems and things | |||
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which you can't represent in terms of | |||
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compare should just say that in terms of | |||
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these two components spin as you're | |||
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talking about for the lay audience all | |||
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of the matter that they think about | |||
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