'Time is an illusion. Lunchtime doubly so,” said Ford Prefect in Douglas Adams’s The Hitchhiker’s Guide to the Galaxy. For the past century, mainstream physics has agreed with him. To most of us, it seems obvious that the world is moving steadily forward through time, from a known past, through an active present, into a mysterious future. But, as Einstein said, “physicists believe the separation between past, present, and future is only an illusion, although a convincing one”.
“Mainstream physics basically eliminates time as a fundamental aspect of nature,” explains Prof Lee Smolin, a physicist at the Perimeter Institute for Theoretical Physics, in Ontario, Canada. “It does that in various ways, but the most common is the so-called 'block universe’ picture, which is derived from general relativity.”
Under this system, what is actually real is not our passage through time, but the whole of reality at once. “Imagine taking a movie of your life,” says Prof Smolin, “and laying out the frames on a table, and saying: that is your life. There is no now, there is no change.”
He thinks that it is high time – so to speak – this view was overturned. In his new book Time Reborn, he makes the case that time is a fundamental reality of the universe, and that without it, too many of the big questions of physics are left unanswerable.
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