Astrophysicist Robert Matthews offers a synopsis of Lee Smolin’s 2013 book, Time Reborn, arguing that time really exists:
Formed from the collapse of giant stars, black holes are notorious for having gravitational fields so strong not even light can escape them. Exactly what happens inside them isn’t known for sure, but there are hints from quantum theory that the centre of black holes may be the birth-places of whole new universes, each with different laws of physics.
Smolin points out that if this is correct, then a kind of cosmic version of Darwinian natural selection could apply, in which the most common universes will be those most suitable for producing black holes. And this, he says, can be put to the test in our Universe. After countless aeons of cosmic evolution, our Universe should by now be ruled by laws of physics well-suited to producing black holes. According to Smolin, astrophysicists can check to see if this is actually true – and to date the evidence suggests it is.
The most striking evidence, though, may be our own existence. Black holes are formed from the death of huge stars in supernova explosions. Intriguingly, these are the very same stars that produce the carbon, oxygen and other elements required for life. If there were no giant stars, there would be no universe-spawning black holes and no evolving laws of physics – and no us, either.
Smolin is thus suggesting that our very existence may be evidence for cosmic evolution. And since evolution can only happen over time, that in turn suggests time is real. It’s an astonishing line of argument for the reality of time – and one that doesn’t convince everyone. “I find these ideas very speculative – to say the least,” says theorist Prof Claus Kiefer of the University of Cologne in Germany. He doubts even the starting point for Smolin’s argument for the reality of time: “There is no evidence whatsoever that new universes are born inside black holes.”
Evidence? The whole concept went out with the idea of a universe. The multiverse dispenses with evidence.
In fairness, it’s not easy to get all the science kitsch (Darwinism, multiverse, black hole woo) together in just one theory; gotta give Smolin credit for that.
See also: The Science Fictions series at your fingertips (cosmology) for how and why evidence no longer matters.
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