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304 pages, Hardcover
Published June 14, 2022
‘—Higgs suddenly remarked that it had “ruined my life”. To know nature through mathematics, to see your theory confirmed, to win the plaudits of your peers and join the exclusive club of Nobel laureates: how could all this equate with ruin? To be sure I had not misunderstood, I asked again the next time we spoke. He explained: “My relatively peaceful existence was ending. I don’t enjoy this sort of publicity. My style is to work in isolation, and occasionally have a bright idea.’
‘All that we know so far is that according to quantum mechanics, when a hot gas of Higgs bosons cools, it condenses to form the universal Higgs field. We do not know how this condensation of bosons happens, or what the nature of the field actually is—does it have structure of its own, forming a dynamic medium whose innards are yet to be revealed, or is it made of featureless bosons fused together like molecules of water, merging first into drops and eventually into entire oceans? For now, all we know is its effect: this field acts on the fundamental particles, giving them mass, enabling atoms to form, stars to shine, and ultimately life to occur.’
‘Whereas the photon, the agent of the electromagnetic force, has no mass, the key feature of its analogue for the weak force—the W boson—is that it is massive. This matters for us because the weak force controls the first stage of the solar fusion cycle, in which protons transmute through a series of processes to form helium, liberating the energy that has spawned life on Earth. The weak force is so feeble that if you were a proton in the sun at its birth, today—five billion years later—there would still be only a 50:50 chance that you had undergone fusion. If the W had no mass at all, like the photon, the “weak” force at work in the sun would instead have been as powerful as the electromagnetic force. The transmutation of hydrogen into helium, which is the key process in driving the sun’s fusion engine, would have happened much faster than in reality, and the sun would have expired very quickly. Thus, the fact that intelligent life has managed to evolve is, not least, because the sun has lasted for billions of years, which in turn is because the W has mass. Our existence is consequential on the Higgs field.’
‘Mathematics contains a logical scheme with explicit rules, such that a mathematical theorem once proved is good forever. Fresh axioms might produce extensions of the theorem, or reveal assumptions that when correctly accounted for lead to new implications. Higgs loved the machinery of mathematics—its algebraic codes, the differential geometries of shapes and maps, the strange symbols of integration and differential calculus. Some find joy in manipulating the equations, much as for some the technical performance of Vladimir Horowitz at the piano keyboard is a wonder in its own right; for Higgs, however, the music was the delight, the ability of mathematics to reveal the beauty hidden in nature. That is what crystallised his decision to become a theoretical physicist.’
‘—his interest in the subject had come mainly from his own reading, including Max Born’s classic text, Atomic Physics, which included information about Dirac’s achievements. It had also become clear to him that he would not become an engineer—because of his lack of practical skills; instead, he would become a physicist.—that same lack of practical skills, which made him incompetent in the laboratory, would prevent him from becoming an experimental physicist. Instead, theoretical physics would become his domain.’
‘After about 150 million years, clouds of gas formed the first stars, the engines that forge the nuclei of heavier elements, such as carbon, oxygen, and iron. About five billion years ago, a whole smorgasbord of elements of the periodic table had been fused, and these formed the huge sphere that became planet Earth. The sun is powered by transmutation of its hydrogen fuel into helium ash, this taking place slowly because of the feebleness of the weak force, which itself is a consequence of the Higgs field. Massless photons, meanwhile, stream across space, warming the Earth. Thanks to these products of electroweak symmetry breaking, the sun has burned long enough that evolution has organised collections of atoms into self-aware human forms, capable of knowing nature.’
‘Confirmation of the Higgs boson has emphasised that hidden symmetry—the child of spontaneous symmetry breaking where stability trumps symmetry—is very wide ranging and a key ingredient to describing the natural world. Superconductivity stimulated awareness of the phenomenon in the first place, and when it was taken over to the physics of fundamental particles, it turned out to be key to the whole edifice of the Standard Model. Or almost all of it, for there is no known fundamental reason why mirror symmetry is overturned in the weak interaction: why is nature left-handed?’
‘—Higgs boson has brought us to the end of the beginning, not to the beginning of the end. What dark matter is made of, whether there are further “dark Higgs bosons” to be found, and how the Higgs field is formed are questions for the future.’