"In science, you've got to go against what the elders are saying"

The string theorist Brian Greene has grown from maths prodigy to physics iconoclast. Now he hopes to

As a child, Brian Greene interpreted the story of Icarus differently to most people. "In my naivety, I thought that it was a story about a boy who was bucking authority, not doing what his father said and yet he was paying the ultimate price," he says. "As I got older and became a scientist, it seemed more off-base, because in order to have great breakthroughs in science, you've got to go against what the elders are saying."

Greene has spent his career as a physics professor doing exactly that, exploring the wild frontiers of superstring theory: an unproven, untested and possibly untestable outcrop of theoretical physics. It's an attempt to resolve a conundrum: that we have working explanations of the universe on a grand scale (Einstein's general relativity) and the subatomic scale (quantum mechanics) but no one can reconcile the two. String theory tries to provide a "theory of everything" by suggesting that all matter is, at its smallest level, made of one-dimensional, vibrating loops, whose oscillation patterns determine their mass and "flavour".

For more than a decade, this 48-year-old vegan has been its most compelling advocate. As he wrote in 1999, "String theory has the potential to show that all of the wondrous happenings in the universe -- from the frantic dance of subatomic quarks to the stately waltz of orbiting binary stars; from the primordial fireball of the big bang to the majestic swirl of heavenly galaxies -- are reflections of one, grand physical principle, one master equation."

Greene now lives in upstate New York but he was born in what was, in 1963, a rough district of Manhattan. His father, Alan, a high-school drop-out who became a professional musician and composer, spotted his son's precocious mathematical ability when he was just five and set him to work multiplying 30-digit numbers on huge sheets of construction paper. When that began to pall, he asked the young Brian to calculate the number of inches between the earth and the Andromeda galaxy. "That is a very straightforward calculation," he tells me now, sitting in the tea room of a London hotel, "because people know how far away it is in light years. Then you need to convert light years into miles, miles into feet and feet into inches."

His mother has always been less impressed by what he does. "My mom says: 'Why aren't you a doctor?' and I'm like, 'I am a doctor!' and she's all, 'No, I mean a real doctor.' She reads my books but she says they give her a headache."

His run-down school ran out of things to teach him when he was 11, so one of the staff sent him knocking on the doors of the graduate students at Columbia University, bearing a note: "Take this kid on, he's hungry to learn." Thankfully, one of them did. "For no money," he points out. "Because we didn't have any money. He just did this for the love of learning."

Time travel

It is fitting that Greene is now a professor at Columbia and co-director of its Institute for Strings, Cosmology and Astroparticle Physics. Every few years, he gives what he calls a "report from the trenches" of cutting-edge theoretical physics. In 1999, he wrote an introduction to the subject, The Elegant Universe, followed in 2004 by a book on space-time and the nature of reality. This year, it's parallel universes.

His latest book, The Hidden Reality, suggests that our universe could be one of many, "like slices of bread in a cosmic loaf" or "one expanding bubble in a grand, cosmic bubble bath". He explains the idea of a literal "fabric" of space-time by telling me that a spinning black hole exerts a drag on the space around it, "like a pebble in a vat of molasses -- as the pebble spins, the molasses spins with it". His relaxed, metaphorical prose style has got him into trouble before. One reviewer complained that he "indulge[d] in a pandering sort of lyricism", but of greater concern to Greene were those who read his clear explanations and then turned up at his graduate class expecting to understand the content. One man spent ten years in his basement trying to take his first book's ideas to the next level. "He wrote how his wife almost left him because he wouldn't come out of the basement," Greene tells me. "It was heartbreaking."

Asked to name his scientific hero, he picks Albert Einstein, along with Edward Witten, a Princeton physicist. At the start of the 20th century, Einstein overturned the principles of physics by rejecting Isaac Newton's theory of gravity because it conflicted with his discovery that nothing travels faster than the speed of light. "So many of us," Greene says, "revere [Einstein] but it needs to be said -- because I've seen it reported in an odd way -- that we don't revere Einstein like some gurus of New Age cults may be revered, or some religious leaders. We are constantly critical of everyone's contributions, even Witten's. We look at a given paper, we bang it around, knock it, try to break it."

The same goes for string theory, which could turn out to be completely wrong. "It's a highly speculative subject but I don't shrink from that," he says. "If you ask me: 'Do I believe in string theory?' The answer is: no, I don't. I don't believe anything until it is experimentally proven [and] observationally confirmed."

How would he feel if it turned out to be a blind alley? His answer is surprising. "I would be thrilled." He explains: "I don't mean that in an off-handed way. My emotional investment is in finding truth. If string theory is wrong, I'd like to have known that yesterday. But if we can show it today or tomorrow, fantastic . . . It would allow us to focus our attention on approaches that have a better chance of revealing truth."

This isn't a discipline for the faint-hearted. When Greene was studying for his PhD at Oxford in the 1980s, he was tackling one of the fundamental ideas required to make the maths of string theory work: that there are more than three spatial dimensions. "Our eyes only see the big dimensions but beyond those there are others that escape detection because they are so small," he says. "Yet the exact shape of the extra dimensions has a profound effect on things that we can see, like what the electron weighs, its mass, the strength of gravity."

When he began his doctoral research, there were five possible shapes, one of which he ruled out by mathematical analysis. "The problem was, when I turned back to the list of shapes to look at the second, the list had grown. It was 100. Then 1,000, then 10,000. Ten thousand is still potentially doable -- it would keep an army of graduate students busy for a while -- but, nowadays, it has reached ten to the power of 500, which is an unimaginably huge number; the number of the particles in the observable universe is about ten to the power of 80."

Faced with this abundance, some physicists have decided to abandon the search, while others (including Greene) are trying to find equations to narrow down the field. A third group has a more radical proposal. "Those physicists have said we should take seriously the failure to pick out one shape from the many, because maybe that's telling us there is no unique shape. Maybe the maths is telling us that there are many universes and in each universe one of those shapes is in the limelight."

Mind the gap

Physicists can be an iconoclastic bunch but is there not a danger that their conviction gives fuel to the climate sceptics and creationists who say that science is a belief system, too? "Science is a self-correcting discipline that can, in subsequent generations, show that previous ideas were not correct," Greene counters. "When it comes to climate change . . . [and] the preponderance of data is pointing in a given direction, your confidence needs to rise proportionate to that. The data is very convincing."

He also has trenchant views about religious belief. "My view is that science only has something to say about a very particular notion of God, which goes by the name of 'god of the gaps'. If science hasn't given an explanation for some phenomenon, you could step back and say, 'Oh, that's God.' Then, when science does explain that phenomenon -- as it eventually does -- God gets squeezed out. I think the appropriate response for a physicist is: 'I do not find the concept of God very interesting, because I cannot test it.'"

Before I leave, I raise the idea of the "infinite multiverse", where every possible outcome of an event spins off a different universe. Dropped your piece of toast, buttered side down? There's now a universe where the opposite happened and you didn't have to scrape the fluff off your breakfast. It's one way of dealing with the fact that although a given outcome might have 30 per cent probability, and another might have 70 per cent, nowhere in the laws of physics is there a reason why one happens and not the other.

Doesn't that render the idea of free will redundant? "Yes," he says baldly. "We do not see free will in the equations: you and I are just particles governed by particular laws. Every individual, faced with five choices, would make all five -- one per universe. And all of the choices would be as real as the others." Don't we deserve credit for picking the choice that keeps us in this universe? Greene shakes his head. "Not really, because you are following one trajectory of choices. It is not as though there was a place in the mathematics where your free will dictated that particular set of choices. You are knocked around by the laws of physics, just like all your copies in the other universes."

I look at the preppy professor sitting opposite me drinking a cup of chai and wonder if there is a Brian Greene in another universe who was turned away by every grad student he asked for help. "And joined some gang and just been a street thug?" he says, smiling. "It is possible."

Brian Greene's "The Hidden Reality" is published by Allen Lane (£25)

Helen Lewis-Hasteley is an assistant editor of the New Statesman

Helen Lewis is deputy editor of the New Statesman. She has presented BBC Radio 4’s Week in Westminster and is a regular panellist on BBC1’s Sunday Politics.

This article first appeared in the 06 June 2011 issue of the New Statesman, Are we all doomed?

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Peculiar Ground by Lucy Hughes-Hallett asks how we shape history and how much is beyond our control

In Wychwood, a great house in Oxfordshire, the wealthy build walls around themselves to keep out ugliness, poverty, political change. Or at least they try to. 

The great cutting heads of the Crossrail tunnel-boring machines were engines of the future drilling into the past. The whole railway project entailed a crawl back into history as archaeologists worked hand in hand with engineers, preserving – as far as possible – the ancient treasures they discovered along the way. One of the most striking finds, relics of which are now on display at the Museum of London Docklands, was a batch of skeletons, unearthed near Liverpool Street Station, in which the bacteria responsible for the Great Plague of 1665 were identified for the first time. Past and present are never truly separable.

Lucy Hughes-Hallett’s ambitious first novel ends in 1665 in the aftermath of that plague, and it, too, dances between past and present, history and modernity. Like those skeletons buried for centuries beneath Bishopsgate, it is rooted in the ground. The eponymous “peculiar ground” is Wychwood, a great house in Oxfordshire, a place where the wealthy can build walls around themselves to keep out ugliness, poverty, political change. Or at least that is what they believe they can do; it doesn’t spoil the intricacies of this novel to say that, in the end, they will not succeed.

It is a timely idea. No doubt Hughes-Hallett was working on her novel long before a certain presidential candidate announced that he would build a great wall, but this present-day undiplomatic reality can never be far from the reader’s mind, and nor will the questions of Britain’s connection to or breakage with our European neighbours. Hughes-Hallett’s last book, a biography of Gabriele d’Annunzio, “the John the Baptist of fascism”, won a slew of awards when it was published four years ago and demonstrated the author’s skill in weaving together the forces of culture and politics.

Peculiar Ground does not confine itself to a single wall. Like Tom Stoppard’s classic play Arcadia, it sets up a communication between centuries in the grounds at Wychwood. In the 17th century, John Norris is a landscape-maker, transforming natural countryside into artifice on behalf of the Earl of Woldingham, who has returned home from the depredations of the English Civil War. In the 20th century a new cast of characters inhabits Wychwood, but there are powerful resonances of the past in this place, not least because those who look after the estate – foresters, gardeners, overseers – appear to be essentially the same people. It is a kind of manifestation of what has been called the Stone Tape theory, after a 1972 television play by Nigel Kneale in which places carry an ineradicable echo of their history, causing ghostly lives to manifest themselves through the years.

But the new story in Peculiar Ground broadens, heading over to Germany as it is divided between East and West in 1961, and again as that division falls away in 1989. Characters’ lives cannot be divorced from their historical context. The English breakage of the civil war echoes through Europe’s fractures during the Cold War. The novel asks how much human actors shape history and how much is beyond their control.

At times these larger questions can overwhelm the narrative. As the book progresses we dance between a succession of many voices, and there are moments when their individual stories are less compelling than the political or historical situations that surround them. But perhaps that is the point. Nell, the daughter of the land agent who manages Wychwood in the 20th century, grows up to work in prison reform and ­observes those who live in confinement. “An enclosed community is toxic,” she says. “It festers. It stagnates. The wrong people thrive there. The sort of people who actually like being walled in.”

The inhabitants of this peculiar ground cannot see what is coming. The novel’s modern chapters end before the 21st century, but the future is foreshadowed in the person of Selim Malik, who finds himself hiding out at Wychwood in 1989 after he becomes involved in the publication of an unnamed author’s notorious book. “The story you’re all so worked up about is over,” he says to a journalist writing about the supposed end of the Cold War. “The story I’m part of is the one you need to think about.”

A little heavy handed, maybe – but we know Selim is right. No doubt, however, Wychwood will endure. The landscape of this novel – its grounds and waters and walls – is magically and movingly evoked, and remains in the imagination long after the reader passes beyond its gates. 

Erica Wagner’s “Chief Engineer: the Man Who Built the Brooklyn Bridge” is published by Bloomsbury

Erica Wagner is a New Statesman contributing writer and a judge of the 2014 Man Booker Prize. A former literary editor of the Times, her books include Ariel's Gift: Ted Hughes, Sylvia Plath and the Story of “Birthday Letters” and Seizure.

This article first appeared in the 25 May 2017 issue of the New Statesman, Why Islamic State targets Britain

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