Steven Weinberg: Mechanic

“Considering the pervasive importance of quantum mechanics in modern physics, it is odd how rarely one hears of efforts to test quantum mechanics experimentally with high precision.…The trouble is that it is very difficult to find any logically consistent generalization of quantum mechanics. One obvious target for generalization is the linearity of quantum mechanics, but if we arbitrarily add nonlinear terms to the Schrodinger equation, how do we know that the theory we obtain will have a sensible physical interpretation? At least in part, it is the dearth of generalized versions of quantum mechanics that has made it so hard to plan experimental tests of quantum mechanics.”

Steven Weinberg

"Testing Quantum Mechanics" http://www.sciencedirect.com/science/article/pii/0003491689902765, Annals of Physics (1989)

Effort , Parting

“… I found that I was unable to explain the foundations of quantum mechanics in a way that I found entirely satisfactory.”

Steven Weinberg

The Problems of Quantum Mechanics: Steven Weinberg https://www.youtube.com/watch?v=mBninatwq6k (July 17, 2018) YouTube video at 3:58 of 45:42

Way

“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

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

Motivation

“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

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

Idea , Science , Success , Departure

“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

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

Effort , Life , Success , Search

“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

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)

Sense , Thinking , Books , Making love

“My own conclusion is that today there is no interpretation of quantum mechanics that does not have serious flaws. This view is not universally shared. Indeed, many physicists are satisfied with their own interpretation of quantum mechanics. But different physicists are satisfied with different interpretations. In my view, we ought to take seriously the possibility of finding some more satisfactory other theory, to which quantum mechanics is only a good approximation.”

Steven Weinberg

Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 3: General Principles of Quantum Mechanics

Universe