"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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Would the BBC's Nazi drama SS-GB have felt half so resonant a year ago?

This alternate history is freighted with meaning now we're facing the wurst-case scenario. 

Would SS-GB have felt half so resonant a year ago? Though the clever-after-the-fact Nostradamus types out there might disagree, I can’t believe that it would. When it comes to the Second World War, after all, the present has helpfully stepped in where memory is just beginning to leave off. The EU, in the process of fragmenting, is now more than ever powerless to act in the matter of rogue states, even among its own membership. In case you hadn’t noticed, Hungary, for instance, is already operating as a kind of proto-fascist state, led by Viktor Orbán, a man whom Jean-Claude Juncker, the president of the European Commission, jokingly likes to call “the dictator” – and where it goes, doubtless others will soon follow.

The series (Sundays, 9pm), adapted from Len Deighton’s novel, is set in 1941 in a Britain under Nazi occupation; Winston Churchill has been executed and the resistance is struggling to hold on to its last strongholds in the countryside. Sam Riley plays Douglas Archer, a detective at Scotland Yard, now under the control of the SS, and a character who appears in almost every scene. Riley has, for an actor, a somewhat unexpressive face, beautiful but unreadable. Here, however, his downturned mouth and impassive cheekbones are perfect: Archer, after all, operates (by which I mean, barely operates) in a world in which no one wants to give their true feelings away, whether to their landlady, their lover, or their boss, newly arrived from Himmler’s office and as Protestant as all hell (he hasn’t used the word “degenerate” yet, but he will, he will).

Archer is, of course, an ambiguous figure, neither (at present) a member of the resistance nor (we gather) a fully committed collaborator. He is – or so he tells himself – merely doing his job, biding his time until those braver or more foolhardy do something to restore the old order. Widowed, he has a small boy to bring up. Yet how long he can inhabit this dubious middle ground remains to be seen. Oskar Huth (Lars Eidinger), the new boss, is keen to finish off the resistance; the resistance, in turn, is determined to persuade Archer to join its cause.

It’s hard to find fault with the series; for the next month, I am going to look forward to Sunday nights mightily. I would, I suppose, have hoped for a slightly more charismatic actress than Kate Bosworth to play Barbara Barga, the American journalist who may or may not be involved with the British resistance. But everything else seems pretty perfect to me. London looks suitably dirty and its inhabitants’ meals suitably exiguous. Happiness is an extra egg for tea, smoking is practically a profession, and
the likes of Archer wear thick, white vests.

Swastikas adorn everything from the Palace of Westminster to Trafalgar Square, Buckingham Palace is half ruined, a memorial to what the Germans regard as Churchill’s folly, and the CGI is good enough for the sight of all these things to induce your heart to ache briefly. Nazi brutality is depicted here as almost quotidian – and doubtless it once was to some. Huth’s determination to have four new telephone lines installed in his office within the hour is at one end of this horrible ordinariness. At the other is the box in which Archer’s mutinous secretary Sylvia (Maeve Dermody) furiously stubs out her fag, full to the brim with yellow stars.

When I first heard about The Kettering Incident (Tuesdays, 12.20am; repeated Wednesdays, 10pm) I thought someone must have found out about that thing that happened one time I was driving north on the M1 with a more-than-usually terrible hangover. Turns out it’s a new Australian drama, which comes to us on Sky Atlantic. Anna (Elizabeth Debicki), a doctor working in London, pitches up back in Tasmania many years after her teenage friend Gillian disappeared into its Kettering forest, having seen a load of mysterious bright lights. Was Gillian abducted by aliens or was she, as some local people believe, murdered by Anna? To be honest, she could be working as a roadie for Kylie, for all I care. This ponderous, derivative show is what happens when a writer sacrifices character on the altar of plot. The more the plot thickens, the more jaw-achingly tedious it becomes.

Rachel Cooke trained as a reporter on The Sunday Times. She is now a writer at The Observer. In the 2006 British Press Awards, she was named Interviewer of the Year.

This article first appeared in the 24 February 2017 issue of the New Statesman, The world after Brexit