S cientists are slowly waking up to an inconvenient truth — the universe looks suspiciously like a fix. The issue concerns the very laws of nature themselves. For 40 years, physicists and cosmologists have been quietly collecting examples of all too convenient “coincidences” and

special features in the underlying laws of the universe that seem to be necessary in order for life, and hence conscious beings, to exist. Change any one of them and the consequences would be lethal. Fred Hoyle, the distinguished cosmologist, once said it was as if “a super-intellect has monkeyed with physics”.

To see the problem, imagine playing God with the cosmos. Before you is a designer machine that lets you tinker with the basics of physics. Twiddle this knob and you make all electrons a bit lighter, twiddle that one and you make gravity a bit stronger, and so on. It happens that you need to set thirty something knobs to fully describe the world about us. The crucial point is that some of those metaphorical knobs must be tuned very precisely, or the universe would be sterile.

Example: neutrons are just a tad heavier than protons. If it were the other way around, atoms couldn’t exist, because all the protons in the universe would have decayed into neutrons shortly after the big bang. No protons, then no atomic nucleuses and no

atoms. No atoms, no chemistry, no life. Like Baby Bear’s porridge in the story of Goldilocks, the universe seems to be just right for life. So what’s going on?

The intelligent design movement has inevitably seized on the Goldilocks enigma as evidence of divine providence, prompting a scientific backlash and boosting the recent spate of God-bashing bestsellers. Fuelling the controversy is an unanswered question lurking at the very heart of science - the origin of the laws of physics. Where do they come from? Why do they have the form that they do? Traditionally, scientists have treated the laws of physics as simply “given”, elegant mathematical relationships that were somehow imprinted on the universe at its birth, and fixed thereafter. Inquiry into the origin and nature of the laws was not regarded as a proper part of science.

But the embarrassment of the Goldilocks enigma has prompted a rethink. The Cambridge cosmologist Martin Rees, president of The Royal Society, suggests the laws of physics aren’t absolute and universal but more akin to local bylaws, varying from place to place on a mega-cosmic scale. A God’s-eye view would show our universe as merely a single representative amid a vast assemblage of universes, each with its own bylaws. Rees calls this system “the multiverse”, and it is an increasingly popular idea among cosmologists.

I think this entire line of reasoning is now outdated and simplistic. We will never

fully explain the world by appealing to something outside it that must simply be accepted on faith, be it an unexplained God or an unexplained set of mathematical laws. Can we do better? Yes, but only by relinquishing the traditional idea of physical laws as fixed, perfect relationships. I propose instead that the laws are more like computer software: programmes being run on the great cosmic computer. They emerge with the universe at the big bang and are inherent in it, not stamped on it from without like a maker’s mark.

Man-made computers are limited in their performance by finite processing speed and memory. So, too, the cosmic computer is limited in power by its age and the finite

speed of light. Seth Lloyd, an engineer at Massachusetts Institute of Technology,

has calculated how many bits of information the observable universe has processed

since the big bang. The answer is one followed by 122 zeros. Crucially, however, the limit was smaller in the past because the universe was younger. Just after the big bang, when

the basic properties of the universe were being forged, its information capacity was so restricted that the consequences would have been profound.

Here’s why. If a law is a truly exact mathematical relationship, it requires infinite information to specify it. In my opinion, however, no law can apply to a level of precision finer than all the information in the universe can express. Infinitely precise laws are an extreme idealisation with no shred of real world justification. In the first split second of cosmic existence, the laws must therefore have been seriously fuzzy. Then, as the information content of the universe climbed, the laws focused and homed in on the life-encouraging form we observe today. But the flaws in the laws left enough wiggle room for the universe to engineer its own bio-friendliness.

Thus, three centuries after Newton, symmetry is restored: the laws explain the universe even as the universe explains the laws. If there is an ultimate meaning to existence, as I believe is the case, the answer is to be found within nature, not beyond it. The universe might indeed be a fix, but if so, it has fixed itself. — The Guardian