Steven Weinberg teaches at the University of Texas, Austin. He has been awarded the Nobel Prize in Physics and the National Medal of Science. His latest book is To Explain the World: The Discovery of Modern Science. His essay in this issue is based on the fourth annual Patrusky Lecture of the Council for the Advancement of Science Writing, delivered in San Antonio in October 2016. (January 2017)
The development of quantum mechanics in the first decades of the twentieth century came as a shock to many physicists. Today, despite the great successes of quantum mechanics, arguments continue about its meaning, and its future.
It was the Cambridge historian Herbert Butterfield who described and condemned what he called “the Whig interpretation of history.” In a book with that title, the young Butterfield in 1931 declared that “the study of the past with one eye, so to speak, upon the present is the source of …
In the past fifty years two large branches of physical science have each made a historic transition. I recall both cosmology and elementary particle physics in the early 1960s as cacophonies of competing conjectures. By now in each case we have a widely accepted theory, known as a “standard model.”
Here is the Romney strategy: since you don’t like what you’ve got, vote for what you haven’t got. Whatever it is you haven’t got, it is better than what you’ve got. That was supposed to be enough to secure election after what we’ve got—Obama’s apparent economic failure. But the Romney campaign is taking what-you-haven’t-got-ism to new heights of what-you-mustn’t-know-ism.
The following is part of an introduction to James Baggott’s new book Higgs: The Invention and Discovery of the “God Particle,” which will be published in August by Oxford University Press. Baggott wrote his book anticipating the recent announcement of the discovery at CERN near Geneva—with some corroboration from Fermilab—of …
By the 1980s we had a good comprehensive theory of all observed elementary particles and the forces (other than gravitation) that they exert on one another. One of the essential elements of this theory is a symmetry, like a family relationship, between two of these forces, the electromagnetic force and the weak nuclear force. Electromagnetism is responsible for light; the weak nuclear force allows particles inside atomic nuclei to change their identity through processes of radioactive decay. The symmetry between the two forces brings them together in a single “electroweak” structure. The general features of the electroweak theory have been well tested; their validity is not what has been at stake in the recent experiments at CERN and Fermilab, and would not be seriously in doubt even if no Higgs particle had been discovered.
But one of the consequences of the electroweak symmetry is that, if nothing new is added to the theory, all elementary particles, including electrons and quarks, would be massless, which of course they are not. So, something has to be added to the electroweak theory, some new kind of matter or field, not yet observed in nature or in our laboratories. The search for the Higgs particle has been a search for the answer to the question: What is this new stuff we need?