How physicists lost touch with reality
September 4th,2010 by William
The day I reached the summit of Mauna Kea – Hawaii's highest and most sacred mountain – the sun had just set. But even the dying sun seemed capable of setting alight everything that stretched before us.
The bank of clouds spread out below the summit looked as if fires raged beneath them. The bottom layers of high, storm-driven cirrus clouds burned bright. Between these two layers were the domes of the Keck I and Keck II – twin 10-metre-class telescopes – silhouetted against a sky replete with yellows, oranges, and reds.
The Keck telescopes are helping us understand one of the biggest mysteries in physics and cosmology today: why is the universe being blown apart? Astronomers discovered in the late Nineties – to considerable astonishment, even alarm – that the expansion of the universe is accelerating, and not slowing down as many had predicted. It's as if some mysterious energy is creating a repulsive force to counter gravity. Clueless as to the exact nature of this force, cosmologists call it dark energy. More important, it seems to constitute nearly three-quarters of the total matter and energy in the universe.
Dark energy is the latest and most daunting puzzle to confront cosmologists, adding to another mystery that has haunted them for decades: dark matter. Nearly 90 per cent of the mass of galaxies seems to be made of matter that is unknown and unseen. We know it must be there, for without its gravitational pull the galaxies would have disintegrated. Cosmologists in particular and physicists in general, are now faced with the stark reality that roughly 96 per cent of the universe cannot be explained with the theories at hand. All our efforts to understand the material world have illuminated only a tiny fraction of the cosmos.
And there are other mysteries. What is the origin of mass? What happened to the anti matter that should have been produced along with matter during the big bang? After almost a century of success at explaining our world using the twin pillars of modern physics – quantum mechanics and Einstein's general theory of relativity – physicists have reached a plateau.
The way forward will involve reconciling quantum mechanics with general relativity into a theory of quantum gravity. In situations where the two domains collide – where overwhelming gravity meets microscopic volumes, such as in black holes or in a big bang – the theories don't work well together. In fact, they fail miserably. One of the most ambitious attempts to bring them together is string theory, an edifice of incredible mathematical complexity. Its most ardent proponents hope that it will lead us not just to quantum gravity but to a theory of everything, allowing us to describe every aspect of the universe with a few simple equations.
But the theory's hoped-for denouement is nowhere in sight. Far from explaining our universe, string theory seems to predict the existence of 10 to the power of 500 universes or more. Crucially, the theory is so far from being verified experimentally that it has become the poster child of what is wrong with physics today. Theory has lost touch with experiments – and, so, with reality.
drive from www.independent.co.uk
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Copyright © Martin Rowson 2010
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