- 7,301
- 2,813
pines-demon said:We need more Weyl anecdotes.
I’ll look around. But…
It may take a while.
pines-demon said:We need more Weyl anecdotes.
From M. Chalmers, Model Physicist, CERN Courier (October 2017)Yet Weinberg is not your stereotypical lost-in-his-work genius who locks himself away for long periods to work on a problem. His best ideas don’t come to him while he’s working at all. He recalls one day he came out of the shower and exclaimed to his wife that he had figured out why the cosmological constant is so small (at a time before he had started thinking about anthropic explanations).
He never works in his office. His research work has always been done at home, where he and his wife [Louise Weinberg] have separate offices down the hall from one another and interrupt one another frequently.Then the next day I came out and I said [deep voice] ‘no’! So ideas come to you all the time and most of them are no good, and every once in a while you find one that is good and you have fun working at your desk. Getting good ideas isn’t something you get by trying hard, but by thinking a lot about what problems bother you. But that doesn’t always work either – just think of my ruined summer in 1972!
Doesn’t it distract him?I’m not hard to interrupt. I have a television set on my desk which I keep on while I work, typically watching an old movie, because I find work in theoretical physics so far removed from normal affairs.
But I need the distraction to keep at my desk because the actual work is so, well…it’s so chillingly non-human. I need to feel that I am still part of the human race while I’m doing it.
It appeared on April 31st in the paper.pinball1970 said:An interview with Dirac
Professor Michael Keissling, a faculty member in the Rutgers Department of Mathematics whose field of study is mathematical physics, kindly sent me a transcript of an actual interview with Dirac which appeared in the Wisconsin State Journal of April, 1929.
ROUNDY INTERVIEWS PROFESSOR DIRAC
An Enjoyable Time Is Had By All
By Roundy
I been hearing about a fellow they have up at the U. this spring --- a mathematical physicist, or something, they call him --- who is pushing Sir Isaac Newton, Einstein and all the others off the front page. So I thought I better go up and interview him for the benefit of State Journal readers, same as I do all other top notchers. His name is Dirac and he is an Englishman. He has been giving lectures for the intelligentsia of math and physics departments --- and a few other guys who got in by mistake.
So the other afternoon I knocks at the door of Dr. Dirac's office in Sterling Hall and a pleasant voice says "Come in." And I want to say here and now that this sentence "come in" was about the longest one emitted by the doctor during our interview. He sure is all for efficiency in conversation. It suits me. I hate a talkative guy. I found the doctor a tall youngish-looking man, and the minute I seen the twinkle in his eye I knew I was going to like him. His friends at the U. say he is a real fellow too and a good company on a hike --- if you can keep him in sight, that is.
The thing that hit me in the eye about him was that he did not seem to be at all busy. Why if I went to interview an American scientist of his class --- supposing I could find one --- I would have to stick around an hour first. Then he would blow in carrying a big briefcase, and while he talked he would be pulling lecture notes, proof, reprints, books, manuscript, or what have you out of his bag. But Dirac is different. He seems to have all the time there is in the world and his heaviest work is looking out the window. If he is a typical Englishman it's me for England on my next vacation!
Then we sat down and the interview began.
"Professor," says I, "I notice you have quite a few letters in front of your last name. Do they stand for anything in particular?"
"No," says he.
"You mean I can write my own ticket?"
"Yes," says he.
"Will it be all right if I say that P.A.M. stands for Poincare' Aloysius Mussolini?"
"Yes," says he.
"Fine," says I, "We are getting along great! Now doctor will you give me in a few words the low-down on all your investigations?"
"No," says he.
"Good," says I. "Will it be all right if I put it this way --- `Professor Dirac solves all the problems of mathematical physics, but is unable to find a better way of figuring out Babe Ruth's batting average'?"
"Yes," says he.
"What do you like best in America?", says I.
"Potatoes," says he.
"Same here," says I. "What is your favorite sport?"
"Chinese chess," says he.
That knocked me cold! It was sure a new one on me! Then I went on: "Do you go to the movies?"
"Yes," says he.
"When?", says I.
"In 1920 --- perhaps also in 1930," says he.
"Do you like to read the Sunday comics?"
"Yes," says he, warming up a bit more than usual.
"This is the most important thing yet, doctor," says I. "It shows that me and you are more alike than I thought. And now I want to ask you something more: They tell me that you and Einstein are the only two real sure-enough high-brows and the only ones who can really understand each other. I wont ask you if this is straight stuff for I know you are too modest to admit it. But I want to know this --- Do you ever run across a fellow that even you can't understand?"
"Yes," says he.
"This well make a great reading for the boys down at the office," says I. "Do you mind releasing to me who he is?"
"Weyl," says he.
The interview came to a sudden end just then, for the doctor pulled out his watch and I dodged and jumped for the door. But he let loose a smile as we parted and I knew that all the time he had been talking to me he was solving some problem that no one else could touch.
But if that fellow Professor Weyl ever lectures in this town again I sure am going to take a try at understanding him! A fellow ought to test his intelligence once in a while.
It's fake? All of it or Newspaper embellishments?haushofer said:It appeared on April 31st in the paper.
It's not entirely certain, but I'd say it's a complete fake, yes. I recently translated this interview for an upcoming popular science book, and consulted Graham Farmelo's "The Strangest Man" for it. The interview never appeared in any newspaper, is not to be found in any archive, and Farmelo hypothesizes that the interview was a prank, maybe used for his leave at the university of Wisconsin-Madison. This "Roundy" was also well-known for his "quirky humor".pinball1970 said:It's fake? All of it or Newspaper embellishments?
What a shame. I got the story from the strangest man originally then found that transcript.haushofer said:It's not entirely certain, but I'd say it's a complete fake, yes. I recently translated this interview for an upcoming popular science book, and consulted Graham Farmelo's "The Strangest Man" for it. The interview never appeared in any newspaper, is not to be found in any archive, and Farmelo hypothesizes that the interview was a prank, maybe used for his leave at the university of Wisconsin-Madison. This "Roundy" was also well-known for his "quirky humor".
But who knows; maybe it has a grain of truth in it ;)
Source: Weisskopf, The Joy of Insight: Passions of a Physicist.We took off over the ocean on a beautiful, clear day, but as we approached Boston, the weather grew threatening. The pilot, worried about flying into the storm, decided to land at the seaplane airport in New London, Connecticut. Unfortunately, this was a navy airport. The tower at New London informed our pilot in the strongest terms that civilian planes were forbidden to land there, but the pilot felt he had no other choice. As he came closer and closer to the landing site, we could see a fat, red-faced man waving and shouting at us, obviously signaling that we were not allowed to land. The pilot expressed his anxiety to us about the whole affair.
Oppenheimer patted him on the shoulder and said,
When we touched down, the fat man, who turned out to be a captain, was furious with us. Sputtering and shouting, he told us we were breaking the law and described the penalties for what we had done. Oppenheimer came out of the plane first.You just land the plane and let me handle this.
he announced, and then he explained our reasons for trying to land. The captain gasped and asked,My name is Oppenheimer
Oppie replied,Are you the Oppenheimer?
Then the captain realized with whom he was dealing. Instantly the mood changed from rage to veneration, and suddenly the captain couldn't have been more polite and cordial. He was terribly impressed that Oppenheimer, the great hero, had honored him by dropping in on his little field. Ceremoniously he led us to the command office, where we were given tea and cookies and put on a navy bus that took us to Boston. None of us was ever quite that famous again.I am an Oppenheimer.
I could not find anything about it on the web...sbrothy said:I'm not sure if the story is apocryphal or not but there seems to be a lot of references saying that Oppenheimer (I think after Operation Paperclip) had difficulties shaking hands with Fritz Haber the inventor of the WW1 battlefield poison gas.
It was Ernest Rutherford, not Oppenheimer.pines-demon said:I could not find anything about it on the web...
Hans Lenk, Zur Verantwortungsfrage in den NaturwissenschaftenMax Born, like Haber a Nobel Prize winner, but at the end of his life very thoughtful and almost hopeless, mentioned that Rutherford, one of the first and greatest nuclear physicists, refused “to accept an invitation to my house together with Haber because he did not want to shake hands with the inventor of gas warfare”.
In "What can you really know?" The New York Review of Books (2012), Dyson adds[SS] And eat at High Table?
Even if I wanted to, I didn't eat much at High Table because it wasn't my kind of food. It was too elegant for me. I needed calories and at that time food was pretty scarce in England, it was still rationed, and I found I could do better with the food ration, cooking it myself, than they did at the High Table. So that's what I did, and next door to me there was Wittgenstein, who lived on the same staircase, and he always cooked for himself too, and so I used to cook my supper with the smell of fish from Wittgenstein's room next door.
[SS] And you got to get to know him?
A little bit. Of course, Wittgenstein was a man who loved to torture people and so he invited me into his rooms one day - this was the closest contact I ever had with him, in fact. I mean, we passed each other very often on the stairs without speaking, but once he suddenly invited me into his rooms and said,
So I was thrilled, I said,Would you like to come and have a cup of coffee?
So I came in there and there was one chair, and he invited me to sit down in it, and it was a canvas deck chair which meant I was practically lying horizontally on this canvas chair, and he was standing uncomfortably waiting for me to say something, and so I found it acutely embarrassing, but in any case, I'd come in and so I thought I might as well try, and so eventually I decided I would start a conversation. So I said to him,Yes, I'll certainly come.
And so Wittgenstein looked at me in a very, very hostile fashion and he said,Well, you know, I read the Tractatus and I'd be interested to know whether you still believe the things you said in the Tractatus or have you changed you mind?
That was the end of the conversation. So there was another long silence, and then I drank the coffee and left.Tell me please, which newspaper do you represent?
So I didn't get much out of Wittgenstein. I had the impression he was simply a charlatan. He loved to torture people and he was of course always extremely insulting to women. He couldn't tolerate women coming to his lectures, and he would just simply be so rude that they had to leave. So a thoroughly disagreeable character, and apart from the Tractatus I never read any of his stuff, so I shouldn't judge him but - I think I consider him anyway overrated as a philosopher.
Fifty years later, walking through a churchyard on the outskirts of Cambridge on a sunny morning in winter, I came by chance upon his tombstone, a massive block of stone lightly covered with fresh snow. On the stone was written the single word, "WITTGENSTEIN." To my surprise, I found that the old hatred was gone, replaced by a deeper understanding. He was at peace, and I was at peace too, in the white silence. He was no longer an ill-tempered charlatan. He was a tortured soul, the last survivor of a family with a tragic history, living a lonely life among strangers, trying until the end to express the inexpressible.
That seems to be a notorious encounter: physicist versus philosopher. I have a translation of Popper's book "The Logic of Scientific Discovery" that contains facsimiles of his exchange (through letters) with Einstein who criticized Popper's book.pines-demon said:This is more a story about the philosopher Ludwig Wittgenstein than about Dyson but it is an interesting encounter, here it goes.
That explains why I couldn't find anything to back up my claim. I was barking up the wrong tree. Thanks for setting that straight.fresh_42 said:It was Ernest Rutherford, not Oppenheimer.
Hans Lenk, Zur Verantwortungsfrage in den Naturwissenschaften
https://publikationen.bibliothek.kit.edu/1000024963/24288706
It is an interesting article "On the question of responsibility in the natural sciences" with a list of references that isn't less interesting, e.g. Born's article "The destruction of ethics by the natural sciences. Reflections of a physicist." Harsh words! It's too bad my Google Translate trick with Chrome does not work with pdf.sbrothy said:That explains why I couldn't find anything to back up my claim. I was barking up the wrong tree. Thanks for setting that straight.
Fast draw is one of the fastest sports in the world. Every time is measured under one second, from the signal to draw to when the timer is stopped. The current World Fast Draw Association (WFDA) record for Open Class Fast Draw in an event called Standing Balloons is .208 seconds - and that includes the time it takes to react, draw, fire and pop a balloon target at eight feet away. A world class competitor can draw and fire a shot in under half a second. Given that the average human reaction time is around 0.2 to 0.25 seconds, the round is over before most people can react. The reaction times of the best fast draw shooters is 0.145 seconds, which means that the gun is cocked, drawn, aimed (from the hip), and fired in just over 0.06 seconds. To establish a World Fast Draw Association record, a second shot must be fired in the same competition that is no more than 0.30 seconds slower than the first; this is intended to prevent a shot that anticipates the start signal from setting a record. In competitions where two rounds must be fired, at separate targets, less than 0.10 seconds separate the shots.pines-demon said:Gunslinger effect
Following up on Bohr stories, here is an anecdote about his psychological hypothesis.
From: G. Gamow, Biography of Physics
The effect has even a Wiki entry with experimental evidence: Gunslinger effect
We are still waiting.Roses are red,
violets are blue.
The time has come for monopole two!
Actually this interview is interesting, various important physicists are named.pines-demon said:Cabrera's romantic monopole
On the night of St. Valentine (14th February) of 1984, Blas Cabrera Navarro (grandson of Spanish experimental physicist Blas Cabrera) from Stanford, recorded an event which had the signature of a magnetic monopole with a single Dirac magnetic charge. A year later, Cabrera received a Valentine's card from Sheldon Glashow, which read:
We are still waiting.
Source: AIP Oral History with Blas Cabrera Navarro, 2021
Yes, there was a Spaniard there [in Solvay]
If you are interested in the Stern–Gerlach experiment, see also comment #86Swamp Thing said:The Experiment that Confirmed Quantum Mechanics:
Fascinating insights into how the Stern-Gerlach story came to pass.
Swamp Thing said:The Experiment that Confirmed Quantum Mechanics:
Fascinating insights into how the Stern-Gerlach story came to pass.
Despite all of that Gödel did get the US nationality.In 1947, Kurt Gödel, Albert Einstein, and Oskar Morgenstern drove from Princeton to Trenton in Morgenstern’s car. The three men, who’d fled Nazi Europe and become close friends at the Institute for Advanced Study, were on their way to a courthouse where Gödel, an Austrian exile, was scheduled to take the U.S.-citizenship exam, something his two friends had done already. Morgenstern had founded game theory, Einstein had founded the theory of relativity, and Gödel, the greatest logician since Aristotle, had revolutionized mathematics and philosophy with his incompleteness theorems. Morgenstern drove. Gödel sat in the back. Einstein, up front with Morgenstern, turned around and said, teasing,
Gödel looked stricken.Now, Gödel, are you really well prepared for this examination?
To prepare for his citizenship test, knowing that he’d be asked questions about the U.S. Constitution, Gödel had dedicated himself to the study of American history and constitutional law. Time and again, he’d phoned Morgenstern with rising panic about the exam. (Gödel, a paranoid recluse who later died of starvation, used the telephone to speak with people even when they were in the same room.) Morgenstern reassured him that
But Gödel only grew more upset. Eventually, as Morgenstern later recalled,at most they might ask what sort of government we have.
He’d found a logical flaw.he rather excitedly told me that in looking at the Constitution, to his distress, he had found some inner contradictions and that he could show how in a perfectly legal manner it would be possible for somebody to become a dictator and set up a Fascist regime, never intended by those who drew up the Constitution.
Morgenstern told Einstein about Gödel’s theory; both of them told Gödel not to bring it up during the exam. When they got to the courtroom, the three men sat before a judge, who asked Gödel about the Austrian government.
Gödel said.It was a republic, but the constitution was such that it finally was changed into a dictatorship,
the judge repliedThat is very bad,
Morgenstern and Einstein must have exchanged anxious glances. Gödel could not be stopped.this could not happen in this country.
the judge said,Oh, yes, I can prove it.
and ended the examination.Oh, God, let’s not go into this,
Neither Gödel nor his friends ever explained what the theory, which has since come to be called Gödel’s Loophole, was. For some people, conjecturing about Gödel’s Loophole is as alluring as conjecturing about Fermat’s Last Theorem.
Details:the order-4 symmetry group of a mattress, and how an alternating sequence of the two easiest non-trivial group operations…takes you in sequence through all four mattress orientations, thereby preserving as much as possible the symmetry of the mattress under perturbations by sleepers [and] enhancing its lifetime
The paper contains a single citation: Volker Heines “Theory of Compliant Mattress Group lecture notes on applications of group theory"The paper goes on to observe that the symmetry group of a mattress (that is, the collection of all transformations under which it is mathematically invariant) contains four elements. The first element is the identity transformation, which leaves the mattress’ orientation unchanged. The other three elements are rotations about the mattress’ axes of symmetry. Listed “in order of increasing physical effort required to perform”, these rotations are:
Ideally, S should be avoided in order to minimize effort”, the paper continues. Fortunately, there is a solution: “It is easily seen that alternate applications of V and L will cause the mattress to go through all ‘proper’ orientations relative to the bed, in a cycle of order 4. The following algorithm will achieve this in practice: Odd months, rotate about the lOng axis. eVen months, rotate about the Vertical axis.” In case this isn’t memorable enough, the paper advises that “potential users of this algorithm may find it helpful to write it down on a piece of paper which should be slipped under the mattress for retrieval later when it may have been forgotten.
- V, rotation by π (180 degrees) about a vertical axis (that is, keeping the mattress flat and spinning it around so that the erstwhile head area is at the feet)
- L, rotation by π about the longer axis of symmetry (that is, flipping the mattress from the side of the bed, such that the head and foot ends remain in the same position relative to the bed, but the mattress is now upside down)
- S, rotation by π about the shorter axis of symmetry (that is, flipping the mattress from the end of the bed, such that the head and foot ends swap places while the mattress is simultaneously turned upside down)
Michell devised a torsion balance for measuring the mass of the Earth, but died before he could use it. His instrument passed into the hands of his lifelong friend Henry Cavendish, who first performed in 1798 the experiment now known as the Cavendish Experiment. Placing two 1-kg lead balls at the ends of a six-foot rod, he suspended the rod horizontally by a fibre attached to its centre. Then he placed a massive lead ball beside each of the small ones, causing a gravitational attraction that led the rod to turn clockwise. By measuring the rod's movement, Cavendish was able to calculate the force exerted by each of the large balls on the 1-kg balls. From these calculations, he was able to provide an accurate estimate of the gravitational constant and of the mass and average density of the Earth. Cavendish gave Michell full credit for his accomplishment.
Michell was the first to propose the existence of celestial bodies similar to black holes. Having accepted Newton's corpuscular theory of light, which posited that light consists of minuscule particles, he reasoned that such particles, when emanated by a star, would be slowed down by its gravitational pull, and that it might therefore be possible to determine the star's mass based on the reduction in speed. This insight led in turn to the recognition that a star's gravitational pull might be so strong that the escape velocity would exceed the speed of light. Michell calculated that this would be the case with a star more than 500 times the size of the Sun. Since light would not be able to escape such a star, it would be invisible.
The great cause of the October Revolution is being despicably betrayed. The country is inundated with torrents of blood and filth. Millions of innocent people are being thrown into prisons and no-one can tell when his own turn will come. It is clear, comrades, that the Stalinist clique has carried out a fascist coup. Socialism has remained only on the pages of the habitually lying newspapers. In his rabid hatred of genuine socialism, Stalin is not different from Hitler and Mussolini.
Of course this was written under coercion or torture.At the beginning of 1937, we came to the conclusion that the Party had degenerated and that the Soviet government no longer acted in the interests of workers but in the interests of a small ruling group, that the interests of the country demanded the overthrow of the existing government, and creation in the U.S.S.R. of a state that would preserve the kolkhozes and State property for industry, but build upon the principles of bourgeois-democratic state.
It is said that Kapitsa was brought to a tribunal and later Landau was released in 1939 under the condition that he would develop the theory superfluidity in the upcoming years. Kapitsa would be held responsible of any actions that Landau would take afterwards. Landau seminal paper on superfluidity appeared just two years later. Individual Nobel Prizes for Landau and Kapitsa were awarded afterwards.In my recent studies on liquid helium close to the absolute zero, I have succeeded in discovering a number of new phenomena... I am planning to publish part of this work... but to do this I need theoretical help. In the Soviet Union it is Landau who has the most perfect command of the theoretical field I need, but unfortunately he has been in custody for a whole year. [...]
I spent a year in prison and it was clear that I would be unable to live for even another half year.
I will be nice to find the movie. Bonus cartoon of Fred Hoyle:There is a charming story, not taken seriously by all historians, about how steady state theory began. The idea came in 1947, [Fred] Hoyle claimed, when he and his fellow scientists Hermann Bondi and Tommy Gold went to a movie. The three knew each other from shared research on radar during World War II. Hoyle was versatile, undisciplined and intuitive; Bondi had a sharp and orderly mathematical mind; Gold's daring physical imagination opened new perspectives. The movie was a ghost story that ended the same way it started. This got the three scientists thinking about a universe that was unchanging yet dynamic. According to Hoyle,
One tends to think of unchanging situations as being necessarily static. What the ghost-story film did sharply for all three of us was to remove this wrong notion. One can have unchanging situations that are dynamic, as for instance a smoothly flowing river.
According to another source, Hoyle said:pines-demon said:I will be nice to find the movie.
It refers to Dead of Night (1945) a British horror film.a ghost-story film, which had four separate parts linked ingeniously together in such a way that the film became circular, its end the same as the beginning. I have not been able to trace the name of the film but, drawing on a remote corner of my memory. I think it was called The Dead of Night. Tommy Gold was much taken with it and later that evening he remarked:
How if the universe is constructed like that?
Nearly 60 years later, in June of 1696, Johann Bernoulli set this [brachistochrone] problem as a challenge to the best mathematicians in the world.
Steven Strogatz: Mainly because he's a big show off and he wants to show that he's better than all of them.
He gave everyone six months to come up with solutions, but none were submitted. So Gottfried Leibniz, a friend of Bernoulli's, persuaded him to extend the deadline to give foreigners a chance.
S. Strogatz: And I think Newton was probably the intended target because everybody thought of him as the best, and so Johann would've wanted to show that he was better than Newton. He was no longer a really active mathematician or physicist. He was working as the Warden of the Mint, like a big high government position.
And on the 29th of January, 1697, Newton returned home after a long day at work to find Bernoulli's challenge in the mail. Irritated, he wrote,
But the problem was too enticing, so Newton spent the rest of the day and night on it, and by 4:00 a.m. he had come up with a solution, something that took Bernoulli two weeks! Newton submitted his solution to the journal Philosophical Transactions.I do not love to be dunned and teased by foreigners about mathematical things.
S. Strogatz: he sent his solution there but didn't sign it. And Johann Bernoulli, after seeing the solution, is alleged to have said,
S. Strogatz: You know, that, "Okay, you don't need to sign it, Newton. I can tell who you are. Who else could give such a solution"I recognize the lion by his claw.