The Infinity Puzzle – Frank Close ****

This is a really important popular science book if you are interested in physics, because it covers some of the important bits of modern physics that most of us science writers are too afraid to write about. Starting with renormalization in QED, the technique used to get rid of the unwanted infinities that plagued the early versions of the theory and moving on to the weak force, the massive W and Z bosons, the Higgs business and the development of the concept of quarks and some aspects of the theory covering the strong force that holds them in place, it contains a string of revelations that I have never seen covered to any degree in a popular text elsewhere.

Take that renormalization business. I have seen (and written) plenty of passing references to this, but never seen a good explanation of what the problem with infinities was really about, or how the renormalization was achieved and justified. Frank Close does this. Similarly I hadn’t realised that Murray Gell-Mann, the man behind the ‘quark’ name, originally took a similar view to quarks as Planck did to quanta – a mathematical trick to get the right answer that didn’t reflect anything real in terms of the particles involved.

For at least the first half of the book I was determined to give it five stars, despite itself. The content was sufficiently important and infrequently covered to require this. That ‘despite itself’ is because this is no light read – it makes the infamously frequently unfinished Brief History of Time seem a piece of cake. I think the reason for this is that the concepts here are more alien to the reader than those typically met in traditional ‘hard’ topics like relativity or quantum theory. Close does define a term like gauge invariance before using it, but then keeps using it for chapter after chapter. The trouble is, to the author this is an everyday concept, but to the reader the words are practically meaningless (unlike, say space and time in relativity), so a couple of pages on from the definition we’ve forgotten what it means and get horribly lost. These aspects (spontaneous symmetry breaking is another example) would have benefited hugely from a more detailed explanation and then use of more approachable terms along the way rather than what can be a highly opaque jargon.

I could forgive the author this though. After all his writing style is fine and there is all that interesting content. But there were a couple of things that dragged the book down a little for me. The first was a tendency to skip over bits of science, leaving them mysterious. For example, at one point we are told that a process can be split into five categories: scalar, pseudo-scalar, tensor, vector and axial. Of these only vector and scalar are defined (there are brief definitions in the end notes, but nothing in the main text), so when we are told that the weak force was classified as V-A, we have no clue what this means as we don’t know what axial means, or the significance of the minus sign. This is Rutherfordian stamp collecting, giving us labels without understanding the meaning.

Worse though, and the dominant part of the second half of the book, was that there was just far too much dissecting exactly who contributed exactly what little component to the theory, and who got the Nobel prize for what, and who didn’t get it, despite deserving it. Frankly, this is too much of an insider’s idea of what’s important. We don’t really care. I wish this had been omitted, leaving room for more handholding on the theory.

The trouble is, there were far too many people involved to get any successful human interest going in the story. Nobel prizes of themselves don’t make people interesting. I have two scientific heroes in the last 100 years – Richard Feynman and Fred Hoyle. (Obviously I’m in awe of the work of many others – Einstein, say – but this misses the point.) In that same period there must have been getting on for 300 Nobel prize winners in physics alone. I’m interested in their work, but I can’t get too excited about them as people. Those who criticise popular science for being too driven by the stories of a few individuals when so many have contributed miss the point. You can only have so many heroes.

Overall this remain a really important book if you want to get to grips with modern particle physics and quantum field theory. It fills in lots of gaps that other books gloss over. But it would be remiss of me not to also point out my concerns.

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Review by Brian Clegg

Neutrino – Frank Close *****

At first sight you could easily overlook this book. It’s small and succumbs to that easiest mistakes when dealing with something with a passing involvement with space of having a black cover, which almost inevitably makes a book look dull. It doesn’t cover one of the big topics of the day. Why bother? Because it’s a little cracker.

An awful lot of popular science passes across my desk, and it’s very rare that the vast majority of the content is new and fresh, but that’s the case here. Neutrinos are quantum particles that exist in vast quantities – many billions pass through your body from the Sun every second – yet they are so unlikely to interact with matter that the vast majority pass through the Earth as if it isn’t there. Once it became apparent that neutrinos ought to exist, the challenge was there to find some way of detecting them. But what a challenge.

Frank Close presents the tale of the hunt for the neutrino, and it’s a fascinating story. Apart from anything else, it’s a great example of what real science is like, with researchers in one country not aware of developments elsewhere, and huge pieces of equipment built on the erroneous assumption that protons decayed often enough to be detected then being redeployed as neutrino detectors. I particularly loved the way a scientist got an experiment past a laboratory director by playing on the director’s dislike of astrophysicists, telling him this was a chance to prove them wrong.

This really is physics in the raw – with the added benefit that we are dealing here with the weirdest detectors ever imagined. What would Galileo or Newton have made of telescopes consisting of tonnes of cleaning fluid in a cavern a mile underground? Or detectors that depend on spotting the afterglow of faster-than-light particles, again buried far beneath the Earth?

This is by no means a complete story. There is still plenty to learn about neutrinos, because even with the latest detectors, scientists are only spotting a handful a day. Yet an immense amount has been learned, both about neutrinos themselves and what they tell us about the mechanisms of stars. There is something very satisfying about someone apparently getting a theory wrong by a factor of two, only to be proved correct after 30 years study showed that neutrinos behave in a stranger fashion than anyone ever imagined.

If I’m going to be picky, there’s a ‘reprise’ section at the end that was too long to be a recap and seemed more a filler than anything – but I loved this little book and would highly recommend it to anyone with an interest in physics or astronomy.

 

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Review by Brian Clegg

Nothing: a very short introduction – Frank Close ***

I came to this book for the title. Like “Zero”, “Symmetry”, or “Shapes”, “Nothing” is one of those concepts that seems to offer an intriguing cross-cutting view of science. A few pages into the book, I thought it would deliver on the promise of the title page. But after a couple of chapters I realised that this is a book about Something, not Nothing. A few chapters later it dawned on me that the Something was actually Basic Ideas in Modern Physics. Basic Ideas in Modern Physics is an interesting topic, but not nearly as novel and mind-bending as Nothing.

It’s not Frank Close’s fault that modern physics is preoccupied with nothing-related issues: what happened at the beginning of the universe, when something turned into nothing; how the very smallest particles (or waves) behave; the geometry of space and time. And if you would like to trot through the basics of fields, waves, special and general relativity, quantum theory, the Big Bang, and the structure of the atom, then this book is just what it says on the packet: a stimulating way into new subjects. But somehow I expected more from Nothing.

What is in the book for those who have already trotted through the basics with other science writers? Some old friends reappear – the falling muon to illustrate special relativity, the pencil-on-its-point to describe symmetry breaking. But Close also takes some new angles on the old topics. In general relativity, objects tend to take the shortest route between two points. Close compares this to the tradition of “shortest path” thinking in other fields, like optics. He notes how Einstein’s equations for special relativity are the same, mathematically, as those in Lorentz’s theory of the ether. And he has a good eye for historical details. It’s one thing to say how one might lay out a theory of special relativity. But how did Einstein himself do it, using what he knew at the time? Close has the question – if not the answer – at his fingertips.

But Close’s angles are sometimes too oblique. In explaining special relativity he starts out with the common-sense notion of simultaneity, and explains how it is defeated if we assume light is constant. He then jumps to the conclusion that objects must get longer, and clocks run slower, for observers of a moving object. It’s not clear how he made the jump. We see that Lorentz’s equations are the same as Einstein’s, but it’s not clear why they are the same. His chapter on the quantum vacuum is interesting, with some striking examples of experiments that cast light on the “infinite sea” of the vacuum. But the chapter has about three different arguments for different kinds of “infinite sea”, and it is not obvious how they link up.

Perhaps it was the small font or pocket-sized format, but I found it hard to get a proper grip on this book. It is a compact brainstorm. Close asks lots of questions, but it’s not clear when each one is answered. His no-fuss prose fits a lot in, but sometimes it’s too compressed. He throws out ideas – the anthropic principle, “emergence”, multiple worlds – that look promising but fall out of sight of the reader. By turns stimulating and frustrating, Nothing leaves you wanting to find out more about Basic Ideas in Modern Physics. Which is, after all, better than finding out about nothing.

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Review by Michael Bycroft

Frank Close – Four Way Interview

Frank Close is a theoretical high energy particle physicist at Oxford University. He has given a wide range of public lectures, including the Royal Institution Christmas Lectures in 1993, and has written a number of popular science books. His latest book is Antimatter.

Why Science?

If this means why am I a scientist, it is because I am curious – about how the universe works, why things are as they are, where did it all come from? All young children are curious about the world – they have to learn what is safe and what is not. Then they ask questions: why this, what’s that, until adults get tired and tell them to stop asking so many. Some of us never stop asking. I am still astonished at the beautiful way nature operates; if we had been given the task of making a universe, who would have thought of atoms, and the different elements made from the same electrons but just put together in different ways? Who would have thought of the quantum, or relativity, or a host of other things, none of which the ancient Greeks or even Isaac Newton knew? What else is going on that we don’t know but 200 years from now, if the human race survives, will be in the textbooks for future generations? Wouldn’t you also like to know?

Why this book?

I was on Melvyn Bragg’s radio show In Our Time in 2007 in a programme about antimatter. Afterwards I received lots of emails asking about antimatter and bombs. This led me to Dan Brown’s book Angels and Demons which is fiction, but likes to be presented as if fact. There are certainly two correct facts in it: there is a laboratory called CERN and the scientists there have made antimatter. But as to making bombs, or solving the world’s energy problems – as Brown hints antimatter might be able to do – those are utter fiction. So when I learned that his book was being turned into a movie, I decided to write a book about what antimatter really is, the amazing things that it can do (it can save lives for example) and explain why it cannot do the things that Brown claims in his book. I doubt that this will stop people believing that antimatter is really demonic, or that the director of CERN has a mach 5 aircraft (if only!), but I hope that at least the real wonder of antimatter and science comes across. My final sentence says it all. Having shown the wonders that antimatter has done for science in reality I conclude with
“With such inspirations in fact, who needs fiction?”

What’s next?

I am writing about neutrinos – the ghost particle of the cosmos. It’s turning into the story of Ray Davis, who spent 40 years trying to look into the centre of the sun by detecting neutrinos. Thankfully for him he lived long enough to pick up his Nobel Prize at age 87. Not everyone was so lucky. There’s Bruno Pontecorvo who disappeared behind the Iron Curtain and did not survive long enough to see his great ideas verified by Davis; there’s John Bahcall who worked with Davis for four decades but was not included on the Nobel Prize, and several others – some lucky, others not. Longevity has been an asset in the neutrino business.

What’s exciting you at the moment?

The fact that my younger daughter has just announced that she is pregnant and has seen her child, my first grandchild, courtesy of an ultrasound scan. So we can see an image of an 11 week old living being with arms. Isn’t science marvellous?

Antimatter – Frank Close ****

I like this little book. Regular readers of my reviews will know that ‘little’ isn’t an insult – there’s nothing worse than a bloated, over-inflated popular science book. This one delivers the goods on the subject without resorting to endless padding. The subject in question is antimatter, which Frank Close covers with just enough context – particular the US Air Force’s interest in antimatter weapons, and Dan Brown’s awful antimatter-based thriller Angels and Demons – to keep the reader interested.

It’s a bit of a Brief History of Time kind of book. Before Dr Close gets all excited and waits for the royalties to come crashing in, I don’t really mean that I expect it to have the same kind of popularity of ABHoT, but rather it has the same tendency to plunge into just a bit too much depth and not necessarily to explain the science in a way that comes across well to the uninitiated. Having said that, there is some good writing here explaining why antimatter is so important and how the Big Bang could have result in mostly matter.

Even if you know a bit about antimatter, there are some surprises. And what’s lovely is the way the book really thinks about the practicalities of antimatter. You can’t store antiatoms, for instance, because they aren’t charged, so you can’t keep them in an electromagnetic container away from matter. But you can’t have billions of positrons or antiprotons in the same place either, because they repel each other. I wasn’t clear why you can’t use an anti-plasma – I wish that had been covered.

The presentation is just a touch dry – this is very obviously a book written by an academic who is trying hard to be populist but not quite making it – which is why it only gets four stars rather than five. And I don’t think he does any favours by suggesting that many people seriously think the Tunguska fireball was antimatter. But it’s a really interesting book that stretches the brain and that is packed with glowing little antimatter nuggets.

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Review by Brian Clegg

The Void – Frank Close ***

It’s tempting to wonder why anyone would want to write a book about nothing. It would, I presume, be a short book. This is certainly a slim volume, but packs plenty in, because ‘the void’ is a more subtle and complex concept than mere nothingness. Even so, as an author, this is a title that smacks to me of ‘edge hunting’. Any popular science book needs a special something to hang the book on, whether it’s a person, an event or some special aspect of the science itself. It’s easy to imagine Frank Close having a eureka moment when he hit on the void as that special edge for his book, though as we will see, it’s one of those subjects that sounds great as an initial idea, but is hard to provide with much substance.

As a topic, the void isn’t quite as empty as it seems – at the quantum level, a vacuum is anything but empty – but there really isn’t enough in it to support a whole book, and in practice, though there are bits about vacuum and the void, this is really a book about the development of quantum theory, including the evolution of ideas about the nature of matter and light, using the idea of the void as a hook.

Sadly, it doesn’t work awfully well. Frank Close does not provide enough detail to allow the history of science in the book to be anything other than fleeting, nor does it make it possible to really explain the physics, with too much jargon for a true popular science book. Strangest of all, this is a book that seems to sit solidly in the ‘light is a wave’ historical camp. Although Close makes a passing mention of photons, nearly all the book operates on the assumption not that light has wave-like behaviour, but that it truly is a wave, presumably because Close feels this is easier for the non-technical reader to deal with. This is an unhelpful image, especially when getting into quantum theory – it’s almost as if quantum electrodynamics, describing light’s interaction with matter, and all of Feynman’s work showing how all the wave-like properties could be explained using photons, had never happened. I know we often still speak as if light were a wave for convenience, but a book operating at this level should leave the reader with a less classical view.

Overall a book that failed to satisfy, in part because what seemed like a very interesting hook proved, ironically, to have very little to it.

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Review by Brian Clegg