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20: Sir Roger Penrose - Plotting the Twist of Einstein’s Legacy: Difference between revisions

20: Sir Roger Penrose - Plotting the Twist of Einstein’s Legacy (edit)

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Denis just wanted to get me interested
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https://upload.wikimedia.org/wikipedia/en/thumb/f/f9/Sciama2.jpg/200px-Sciama2.jpg
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[[File:sheetsunx.gif||Curved Space-Time]]
[[File:sheetsunx.gif||Curved Space-Time]]
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I never he wanted me to change my
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physics
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subject I learned an awful lot from
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https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Stephen_Hawking.StarChild.jpg/220px-Stephen_Hawking.StarChild.jpg
 
[https://en.wikipedia.org/wiki/Stephen_Hawking Stephen Hawking]
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Dennis about physics because Dennis sort
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https://upload.wikimedia.org/wikipedia/commons/thumb/5/50/Paul_Dirac%2C_1933.jpg/220px-Paul_Dirac%2C_1933.jpg
 
[https://en.wikipedia.org/wiki/Paul_Dirac Paul Dirac]
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of knew everything and everybody and he
 
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Book: [https://www.amazon.com/Strangest-Man-Hidden-Dirac-Mystic/dp/0465022103 The Strangest Man: The Hidden Life of Paul Dirac, Mystic of the Atom] by [https://en.wikipedia.org/wiki/Graham_Farmelo Graham Farmelo]
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had a real knack of getting if he
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thought two people should meet each
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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
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
in my estimation if not yours Dirac
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would be neck-and-neck with Einstein for
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
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
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
Joe Rogan's program is to push out
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discussion of the hopf fibration because
discussion of the hopf fibration because
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it's an it's the only non-trivial
it's an it's the only non-trivial
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principal bundle that can be visual
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
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
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
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
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
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
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
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
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
the second course was on quantum field
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theory but also spinners and there's an
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
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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Richard
26

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