Skip to main content

Why String Theory? - Joseph Conlon ****

If, like me, you've tended to think of string theory as a way that applied mathematicians and theoretical physicists can have endless fun without ever contributing anything practical to our understanding of the universe, Joseph Conlon's is a useful book to remind us that string theory isn't quite so unlikely and useless as it can seem.

I must admit I've been strongly influenced by anti-string theory books such as Not Even Wrong and The Trouble with Physics. After reading Why String Theory? I have a more balanced view (if still being pretty doubtful of the theory's value). One thing that Conlon does, which I've never never seen elsewhere, is give a detailed description of it how the theory came into being, including the original, 26-dimensional approach that was an attempt to deal with the strong interaction. When this was trumped by quantum chromodynamics, it was almost as if the string theorists were so enamoured with their theory, which has some mathematically beautiful aspects, and a tendency to suddenly fit quite well with other mathematical constructs in physics, that they seem to have a spent a lot of time thinking 'Okay, what can we do with it?' And apart from the possibility of quantum gravity, it's remarkable in how many places it seems to have offered some use, despite its infamous lack of testable predictions to whittle down the vast numbers of potential solutions.

I won't say that this is an ideal popular science title. Like Not Even Wrong, it constantly throws out material that you just have to take the writer's word for being meaningful. It's not that there's heavy maths - there are pretty well no equations - but there's an awful lot you have to take on trust, or glaze slightly as meaningless (to the reader) terms are thrown at you. This isn't helped by a style that sometimes reminds me of a elderly schoolmaster (I was amazed that the author is considerably younger than me) with examples like referring to a person's bottom as a 'derrière' (something my grandma might have done) and throwing in 'crossing the Rubicon of physics' occurring within 2 lines of each other. I'm surprised their weren't Latin tags. Elsewhere we get 'I will, for now, let sobriety be the better part of speculation and be silent whereof I cannot speak...' Note that this is while calling pre-Big Bang ideas 'bad speculation' because they're not based on observation - unlike string theory?

There's also a touch of iffy history of science (we are told that Gell-Mann named the quark after a word in Finnegans Wake, for instance, where it was only the spelling that came from there), and the author rather sneakily compares string theory to astronomy as being 'pursued for the value of intrinsic understanding' rather than anything so grubby as commerce - but doesn't note that at least we know that what astronomers (as opposed to cosmologists) study exists. (Not to mention Conlon being unnecessarily sniffy about practical applications.)

However, I do still recommend this book for everyone who wants to get an up-to-date picture of the state of string theory with a lot of background, and is prepared to take the rather heavy approach, lacking much of an attempt to explain things in words most of us can understand. If, like me, you've tended to the anti-camp, this title (sadly, priced more like a textbook than a popular science title) is a very valuable antidote.

Review by Brian Clegg


Post a Comment

Popular posts from this blog

Astrophysics for People in a Hurry – Neil deGrasse Tyson *****

When I reviewed James Binney’s Astrophysics: A Very Short Introduction earlier this year, I observed that the very word ‘astrophysics’ in a book’s title is liable to deter many readers from buying it. As a former astrophysicist myself, I’ve never really understood why it’s considered such a scary word, but that’s the way it is. So I was pleasantly surprised to learn, from Wikipedia, that this new book by Neil deGrasse Tyson ‘topped The New York Times non-fiction bestseller list for four weeks in the middle of 2017’.

Like James Binney, Tyson is a professional astrophysicist with a string of research papers to his name – but he’s also one of America’s top science popularisers, and that’s the hat he’s wearing in this book. While Binney addresses an already-physics-literate audience, Tyson sets his sights on a much wider readership. It’s actually very brave – and honest – of him to give physics such prominent billing; the book could easily have been given a more reader-friendly title such …

Once upon and Algorithm - Martin Erwig ***

I've been itching to start reading this book for some time, as the premise was so intriguing - to inform the reader about computer science and algorithms using stories as analogies to understand the process.

This is exactly what Martin Erwig does, starting (as the cover suggests) with Hansel and Gretel, and then bringing in Sherlock Holmes (and particularly The Hound of the Baskervilles), Indiana Jones, the song 'Over the Rainbow' (more on that in a moment), Groundhog Day, Back to the Future and Harry Potter.

The idea is to show how some aspect of the story - in the case of Hansel and Gretel, laying a trail of stones/breadcrumbs, then attempting to follow them home - can be seen as a kind of algorithm or computation and gradually adding in computing standards, such as searching, queues and lists, loops, recursion and more.

This really would have been a brilliant book if Erwig had got himself a co-author who knew how to write for the public, but sadly the style is mostly heavy…

Cosmology for the Curious - Delia Perlov and Alex Vilenkin ***

In the recently published The Little Book of Black Holes we saw what I thought was pretty much impossible - a good, next level, general audience science title, spanning the gap between a typical popular science book and an introductory textbook, but very much in the style of popular science. Cosmology for the Curious does something similar, but coming from the other direction. This is an introductory textbook, intended for first year physics students, with familiar textbook features like questions to answer at the end of each chapter. Yet by incorporating some history and context, plus taking a more relaxed style in the writing, it's certainly more approachable than a typical textbook.

The first main section, The Big Bang and the Observable Universe not only covers basic big bang cosmology but fills in the basics of special and general relativity, Hubble's law, dark matter, dark energy and more. We then move onto the more speculative (this is cosmology, after all) aspects, brin…