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Favourite quotes (21448)

“There’s something I’ve been working on for more than a year — maybe it’s just an old man’s obsession, but I’m trying to find an approach to quantum mechanics that makes more sense than existing approaches. I’ve just finished editing the second edition of my book, Lectures on Quantum Mechanics, in which I think I strengthen the argument that none of the existing interpretations of quantum mechanics are entirely satisfactory.”

Steven Weinberg (1933) American theoretical physicist

Steven Weinberg, in " Science’s Path From Myth to Multiverse https://www.quantamagazine.org/20150317-sciences-path-from-myth-to-multiverse/" by Dan Falk (March 17, 2015)

“The years since the mid-1970s have been the most frustrating in the history of particle physics. We are paying the price of our own success: theory has advanced so far that further progress will require the study of processes at energies far beyond the reach of existing facilities. In order to break our of this impasse, physicists began in 1982 to develop plans for a scientific project of unprecedented size and cost, known as the Superconducting Super Collider.”

Steven Weinberg (1933) American theoretical physicist

page 4, 2nd edition https://books.google.com/books?id=Qd0MEtsBr7oC&pg=PA4 <br class="br">Dreams of a Final Theory (1992; 2nd edition 1994)

“It is with Isaac Newton that the modern dream of a final theory really begins.”

Steven Weinberg (1933) American theoretical physicist

page 11, 2nd edition https://books.google.com/books?id=Qd0MEtsBr7oC&pg=PA11 <br class="br">Dreams of a Final Theory (1992; 2nd edition 1994)

“The last thirty years of Einstein's life were largely devoted to a search for a so-called unified field theory that would unify James Clerk Maxwell's theory of electromagnetism with the general theory of relativity, Einstein's theory of gravitation. Einstein's attempt was not successful, and with hindsight we can now see that it was misconceived. Not only did Einstein reject quantum mechanics; the scope of his effort was too narrow. … Nevertheless Einstein's struggle is our struggle today. It is the search for a final theory.”

Steven Weinberg (1933) American theoretical physicist

page 18, 2nd edition https://books.google.com/books?id=Qd0MEtsBr7oC&pg=PA18 <br class="br">Dreams of a Final Theory (1992; 2nd edition 1994)

“The development of quantum mechanics in the 1920s was the greatest advance in physical science since the work of Isaac Newton. It was not easy; the ideas of quantum mechanics present a profound departure from ordinary human intuition. Quantum mechanics has won acceptance through its success. It is essential to modern atomic, molecular, nuclear, and elementary particle physics, and to a great deal of chemistry and condensed matter physics as well.”

Steven Weinberg (1933) American theoretical physicist

Preface
Lectures on Quantum Mechanics (2012, 2nd ed. 2015)

“The principles of quantum mechanics are so contrary to ordinary intuition that they can best be motivated by taking a look at their prehistory.”

Steven Weinberg (1933) American theoretical physicist

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 1: Historical Introduction

“Perhaps the most important immediate consequence of Planck’s work was to provide long-sought values for atomic constants.”

Steven Weinberg (1933) American theoretical physicist

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 1: Historical Introduction

“Planck’s quantization assumption applied to the matter that emits and absorbs radiation, not to radiation itself. As George Gamow later remarked, Planck thought that radiation was like butter; butter itself comes in any quantity, but it can be bought and sold only in multiples of one quarter pound. It was Albert Einstein (1879–1955) who in 1905 proposed that the energy of radiation of frequency ν was itself an integer multiple of hν.”

Steven Weinberg (1933) American theoretical physicist

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 1: Historical Introduction

“In this derivation Bohr had relied on the old idea of classical radiation theory, that the frequencies of spectral lines should agree with the frequency of the electron’s orbital motion, but he had assumed this only for the largest orbits, with large n. The light frequencies he calculated for transitions between lower states, such as n=2 → n=1, did not at all agree with the orbital frequency of the initial or final state. So Bohr’s work represented another large step away from classical physics.”

Steven Weinberg (1933) American theoretical physicist

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 1: Historical Introduction

“Heisenberg’s starting point was the philosophical judgment, that a physical theory should not concern itself with things like electron orbits in atoms that can never be observed. This is a risky assumption, but in this case it served Heisenberg well.”

Steven Weinberg (1933) American theoretical physicist

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 1: Historical Introduction

“One of the things that excited me so much about quantum chromodynamics after the work of Gross and Wilczek and Politzer was that it seemed to provide a rational explanation for what had always been mysterious to me — the fact that there were symmetries, like parity conservation, charge conjugation invariance, and strangeness conservation, that were very good symmetries of the strong and electromagnetic interactions — as far as we knew exact — and yet were not respected by the weak interactions. Why should nature have … symmetries that are symmetries of part of nature but not other parts of nature?”

Steven Weinberg (1933) American theoretical physicist

"Reminiscences of the Standard Model" - Special Colloquium by Steven Weinberg https://www.youtube.com/watch?v=mX2R8-nJhLQ, 17 October 2017, YouTube video at 1:02:17 of 1:39:24

“Finally, learn something about the history of science, or at a minimum the history of your own branch of science. The least important reason for this is that the history may actually be of some use to you in your own scientific work.”

Steven Weinberg Scientist: Four golden lessons

Scientist: Four golden lessons (2003)

“It doesn't work to build half an accelerator. The particles need to go all the way around.”

Steven Weinberg (1933) American theoretical physicist

On The Shoulders of Giants - "The Future of Science" by Steven Weinberg, World Science Festival, YouTube, 2015 https://www.youtube.com/watch?v=5GrjjCVk6cA

“Symmetry is not enough by itself. In electromagnetism, for example, if you write down all the symmetries we know, such as Lorentz invariance and gauge invariance, you don’t get a unique theory that predicts the magnetic moment of the electron. The only way to do that is to add the principle of renormalisability – which dictates a high degree of simplicity in the theory and excludes these additional terms that would have changed the magnetic moment of the electron from the value Schwinger calculated in 1948.”

Steven Weinberg (1933) American theoretical physicist

as quoted in an interview by Matthew Chalmers: [Model physicist, CERN Courier, 13 October 2017, http://cerncourier.com/cws/article/cern/70138]

“If there is no point in the universe that we discover by the methods of science, there is a point that we can give the universe by the way we live, by loving each other, by discovering things about nature, by creating works of art. And that—in a way, although we are not the stars in a cosmic drama, if the only drama we're starring in is one that we are making up as we go along, it is not entirely ignoble that faced with this unloving, impersonal universe we make a little island of warmth and love and science and art for ourselves. That's not an entirely despicable role for us to play.”

Steven Weinberg (1933) American theoretical physicist

Quoted in Frankenberry The Faith of Scientists: In Their Own Words (2008), p. 336

“I managed to get a quick PhD — though when I got it I knew almost nothing about physics. But I did learn one big thing: that no one knows everything, and you don't have to.”

Steven Weinberg Scientist: Four golden lessons

Scientist: Four golden lessons (2003)

“If you have bought one of those T-shirts with Maxwell's equations on the front, you may have to worry about its going out of style, but not about its becoming false. We will go on teaching Maxwellian electrodynamics as long as there are scientists.”

Steven Weinberg (1933) American theoretical physicist

"The Revolution That Didn't Happen" in The New York Review of Books (1998) http://www.nybooks.com/articles/735

“In trying to get votes for the Superconducting Super Collider, I was very much involved in lobbying members of Congress, testifying to them, bothering them, and I never heard any of them talk about postmodernism or social constructivism. You have to be very learned to be that wrong.”

Steven Weinberg (1933) American theoretical physicist

"Night Thoughts of a Quantum Physicist" (February 1995); republished in Facing Up: Science And Its Cultural Adversaries (2001)

“Either by God you mean something definite or you don't mean something definite. If by God you mean a personality who is concerned about human beings, who did all this out of love for human beings, who watches us and who intervenes, then I would have to say in the first place how do you know, what makes you think so? And in the second place, is that really an explanation? If that's true, what explains that? Why is there such a God? It isn't the end of the chain of whys, it just is another step, and you have to take the step beyond that.”

Steven Weinberg (1933) American theoretical physicist

Steven Weinberg, PBS interview, 1998 http://www.pbs.org/faithandreason/transcript/wein-frame.html

“It seems that scientists are often attracted to beautiful theories in the way that insects are attracted to flowers — not by logical deduction, but by something like a sense of smell.”

Steven Weinberg (1933) American theoretical physicist

Physics Today (November 2005) page 35