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

Line 1,165: Line 1,165:




<div data-type="note" data-timestamp="0:11:05">
Denis just wanted to get me interested
</div>
<div data-type="resource" data-timestamp="0:11:05">
<div data-type="resource" data-timestamp="0:11:05">
https://upload.wikimedia.org/wikipedia/en/thumb/f/f9/Sciama2.jpg/200px-Sciama2.jpg
https://upload.wikimedia.org/wikipedia/en/thumb/f/f9/Sciama2.jpg/200px-Sciama2.jpg
Line 1,173: Line 1,170:
</div>
</div>


<div data-type="note" data-timestamp="0:11:10">
<div data-type="resource" data-timestamp="0:11:10">
[[File:sheetsunx.gif||Curved Space-Time]]
[[File:sheetsunx.gif||Curved Space-Time]]
</div>
</div>
<div data-type="note" data-timestamp="0:11:13">
 
I never he wanted me to change my
<div data-type="resource" data-timestamp="0:11:17">
physics
</div>
</div>
<div data-type="note" data-timestamp="0:11:14">
 
subject I learned an awful lot from
<div data-type="resource" data-timestamp="0:11:31">
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]
</div>
</div>
<div data-type="note" data-timestamp="0:11:17">
 
Dennis about physics because Dennis sort
<div data-type="resource" data-timestamp="0:11:40">
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]
</div>
</div>
<div data-type="note" data-timestamp="0:11:20">
 
of knew everything and everybody and he
 
<div data-type="resource" data-timestamp="0:11:46">
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]
</div>
</div>
<div data-type="note" data-timestamp="0:11:23">
 
had a real knack of getting if he
<div data-type="resource" data-timestamp="0:11:59">
</div>
<div data-type="note" data-timestamp="0:11:27">
thought two people should meet each
</div>
<div data-type="note" data-timestamp="0:11:28">
other he got made sure they did meet
</div>
<div data-type="note" data-timestamp="0:11:31">
each other in one case it was Stephen
</div>
<div data-type="note" data-timestamp="0:11:34">
Hawking but Dennis was actually yeah
</div>
<div data-type="note" data-timestamp="0:11:40">
when you mentioned Dirac Dennis was
</div>
<div data-type="note" data-timestamp="0:11:41">
actually the last graduate with at the
</div>
<div data-type="note" data-timestamp="0:11:44">
time he was the only graduate student of
</div>
<div data-type="note" data-timestamp="0:11:46">
directs is that right yes then this was
</div>
<div data-type="note" data-timestamp="0:11:49">
Dirac was famously sort of difficult I
</div>
<div data-type="note" data-timestamp="0:11:53">
think that you know in recent years this
</div>
<div data-type="note" data-timestamp="0:11:56">
book came out of grammar mail of the
</div>
<div data-type="note" data-timestamp="0:11:57">
strangest man that puts directs
</div>
<div data-type="note" data-timestamp="0:11:59">
bizarreness he was difficult to get to
bizarreness he was difficult to get to
</div>
</div>
<div data-type="note" data-timestamp="0:12:04">
 
know but there's a bit of an irony here
<div data-type="resource" data-timestamp="0:12:18">
</div>
<div data-type="note" data-timestamp="0:12:06">
I mean certainly he was hard for
</div>
<div data-type="note" data-timestamp="0:12:10">
physicists and so on to get to know him
</div>
<div data-type="note" data-timestamp="0:12:13">
now there were two people and actually
</div>
<div data-type="note" data-timestamp="0:12:16">
maybe I could just say one thing to our
</div>
<div data-type="note" data-timestamp="0:12:17">
listeners yes
</div>
<div data-type="note" data-timestamp="0:12:18">
in my estimation if not yours Dirac
in my estimation if not yours Dirac
</div>
</div>
<div data-type="note" data-timestamp="0:12:22">
 
<div data-type="resource" data-timestamp="0:12:22">
would be neck-and-neck with Einstein for
would be neck-and-neck with Einstein for
</div>
</div>
<div data-type="note" data-timestamp="0:12:24">
 
the greatest of 20th century physicists
<div data-type="resource" data-timestamp="0:12:34">
</div>
<div data-type="note" data-timestamp="0:12:27">
I think I wouldn't be far off that that
</div>
<div data-type="note" data-timestamp="0:12:30">
description for some reason his press
</div>
<div data-type="note" data-timestamp="0:12:32">
wasn't nearly as good maybe because of
</div>
<div data-type="note" data-timestamp="0:12:34">
his hair I don't know well he didn't
his hair I don't know well he didn't
</div>
</div>
<div data-type="note" data-timestamp="0:12:37">
 
talk much this is one of the problems no
<div data-type="resource" data-timestamp="0:12:42">
</div>
<div data-type="note" data-timestamp="0:12:39">
I agree I think he was I mean you think
</div>
<div data-type="note" data-timestamp="0:12:42">
about all we quantum mechanics people
about all we quantum mechanics people
</div>
</div>
<div data-type="note" data-timestamp="0:12:45">
 
who developed that amazing subject and
<div data-type="resource" data-timestamp="0:13:08">
</div>
<div data-type="note" data-timestamp="0:12:47">
Dirac was really the one who put put it
</div>
<div data-type="note" data-timestamp="0:12:50">
all in order and so on well is is is and
</div>
<div data-type="note" data-timestamp="0:12:53">
this gets to a very odd issue which is
</div>
<div data-type="note" data-timestamp="0:12:55">
that you have wielded taste and beauty
</div>
<div data-type="note" data-timestamp="0:12:58">
as a weapon your entire life your
</div>
<div data-type="note" data-timestamp="0:13:00">
drawings are among the most compelling I
</div>
<div data-type="note" data-timestamp="0:13:04">
remember the first time what are one of
</div>
<div data-type="note" data-timestamp="0:13:06">
the things I've done using our friend
</div>
<div data-type="note" data-timestamp="0:13:08">
Joe Rogan's program is to push out
Joe Rogan's program is to push out
</div>
</div>
<div data-type="note" data-timestamp="0:13:11">
 
<div data-type="resource" data-timestamp="0:13:11">
discussion of the hopf fibration because
discussion of the hopf fibration because
</div>
</div>
<div data-type="note" data-timestamp="0:13:13">
 
<div data-type="resource" data-timestamp="0:13:13">
it's an it's the only non-trivial
it's an it's the only non-trivial
</div>
</div>
<div data-type="note" data-timestamp="0:13:15">
 
<div data-type="resource" data-timestamp="0:13:15">
principal bundle that can be visual
principal bundle that can be visual
</div>
</div>
<div data-type="note" data-timestamp="0:13:17">
 
scene and since the world seems to be
 
</div>
<div data-type="resource" data-timestamp="0:13:32">
<div data-type="note" data-timestamp="0:13:21">
about principle bundles it's a bit odd
</div>
<div data-type="note" data-timestamp="0:13:23">
that the general population doesn't know
</div>
<div data-type="note" data-timestamp="0:13:27">
that stuff of which we are yes well they
</div>
<div data-type="note" data-timestamp="0:13:29">
the hopf fibration or the Clifford
</div>
<div data-type="note" data-timestamp="0:13:32">
parallels was instrumental in the
parallels was instrumental in the
</div>
</div>
<div data-type="note" data-timestamp="0:13:36">
 
subject of Trista theory well but the
 
</div>
<div data-type="resource" data-timestamp="0:13:58">
<div data-type="note" data-timestamp="0:13:38">
first time I ever saw a diagram it was
</div>
<div data-type="note" data-timestamp="0:13:40">
somebody reproducing a diagram they had
</div>
<div data-type="note" data-timestamp="0:13:42">
seen of yours and so the way in which
</div>
<div data-type="note" data-timestamp="0:13:44">
you have used art and sketches yeah it
</div>
<div data-type="note" data-timestamp="0:13:49">
was drawn by hand largely I mean they
</div>
<div data-type="note" data-timestamp="0:13:51">
were adding some circles involved which
</div>
<div data-type="note" data-timestamp="0:13:53">
I use a compass for but basically I
</div>
<div data-type="note" data-timestamp="0:13:55">
draped my hand there were two versions
</div>
<div data-type="note" data-timestamp="0:13:58">
of it the first one was more I sort of
of it the first one was more I sort of
</div>
</div>
<div data-type="note" data-timestamp="0:14:02">
 
thread you die first one was had more
<div data-type="resource" data-timestamp="0:14:06">
</div>
<div data-type="note" data-timestamp="0:14:06">
circles in it and I thought I draw
circles in it and I thought I draw
</div>
</div>
<div data-type="note" data-timestamp="0:14:07">
 
there's more simply in the second
<div data-type="resource" data-timestamp="0:14:10">
</div>
<div data-type="note" data-timestamp="0:14:10">
version but actually I had three
version but actually I had three
</div>
</div>
<div data-type="note" data-timestamp="0:14:11">
 
versions the third version is in the
<div data-type="resource" data-timestamp="0:14:14">
</div>
<div data-type="note" data-timestamp="0:14:14">
road to reality but I'm not sure it's
road to reality but I'm not sure it's
</div>
</div>
<div data-type="note" data-timestamp="0:14:20">
 
best I think the second version perhaps
<div data-type="resource" data-timestamp="0:14:39">
</div>
<div data-type="note" data-timestamp="0:14:21">
is the best so so Dirac getting back to
</div>
<div data-type="note" data-timestamp="0:14:25">
it had this elegance of mind yeah it was
</div>
<div data-type="note" data-timestamp="0:14:28">
unrelenting yes and he famously brought
</div>
<div data-type="note" data-timestamp="0:14:33">
in these bizarre objects with which some
</div>
<div data-type="note" data-timestamp="0:14:37">
of us are obsessed others of us don't
</div>
<div data-type="note" data-timestamp="0:14:39">
understand the obsession called spinners
understand the obsession called spinners
</div>
</div>
<div data-type="note" data-timestamp="0:14:41">
 
which is sort of her a prerequisite to
<div data-type="resource" data-timestamp="0:14:43">
</div>
<div data-type="note" data-timestamp="0:14:43">
getting to twister theory which you've
getting to twister theory which you've
</div>
</div>
<div data-type="note" data-timestamp="0:14:45">
 
popularized well I I went to the UC
<div data-type="resource" data-timestamp="0:14:54">
</div>
<div data-type="note" data-timestamp="0:14:51">
Dirac gave a course of lectures in
</div>
<div data-type="note" data-timestamp="0:14:54">
quantum mechanics and the first course
quantum mechanics and the first course
</div>
</div>
<div data-type="note" data-timestamp="0:14:57">
 
was sort of basic quantum mechanics and
<div data-type="resource" data-timestamp="0:14:59">
</div>
<div data-type="note" data-timestamp="0:14:59">
the second course was on quantum field
the second course was on quantum field
</div>
</div>
<div data-type="note" data-timestamp="0:15:02">
<div data-type="resource" data-timestamp="0:15:02">
theory but also spinners and there's an
theory but also spinners and there's an
</div>
</div>
<div data-type="note" data-timestamp="0:15:06">
 
interesting story about that which I
<div data-type="resource" data-timestamp="0:15:43">
</div>
<div data-type="note" data-timestamp="0:15:08">
don't know the answer to in the second
</div>
<div data-type="note" data-timestamp="0:15:11">
course he deviated from his normal
</div>
<div data-type="note" data-timestamp="0:15:15">
course of lectures now I understood when
</div>
<div data-type="note" data-timestamp="0:15:19">
I talked to Graham family who wrote this
</div>
<div data-type="note" data-timestamp="0:15:22">
biography of Dirac I understood from
</div>
<div data-type="note" data-timestamp="0:15:26">
grand family that when I described that
</div>
<div data-type="note" data-timestamp="0:15:30">
the
</div>
<div data-type="note" data-timestamp="0:15:31">
deviated from his normal course to give
</div>
<div data-type="note" data-timestamp="0:15:34">
two or three lectures on two component
</div>
<div data-type="note" data-timestamp="0:15:37">
spinners which for me were absolutely
</div>
<div data-type="note" data-timestamp="0:15:40">
what I needed you see I'd learned from
</div>
<div data-type="note" data-timestamp="0:15:43">
my work on algebraic geometry we changed
my work on algebraic geometry we changed
</div>
<div data-type="note" data-timestamp="0:15:46">
that by trying to understand tensor
</div>
<div data-type="note" data-timestamp="0:15:48">
systems as abstract systems and things
</div>
<div data-type="note" data-timestamp="0:15:52">
which you can't represent in terms of
</div>
<div data-type="note" data-timestamp="0:15:53">
compare should just say that in terms of
</div>
<div data-type="note" data-timestamp="0:15:55">
these two components spin as you're
</div>
<div data-type="note" data-timestamp="0:15:56">
talking about for the lay audience all
</div>
<div data-type="note" data-timestamp="0:16:00">
of the matter that they think about
</div>
</div>
26

edits