Symmetry or fine-tuning?
by Ruth Bancewicz & Francesca Day
Why is there so much symmetry in nature? I shared some examples in an earlier post, and questioned whether there was a link between these and the ‘fine-tuning’ of the universe. I asked Francesca Day, a PhD student at the University of Oxford, if she could investigate. Francesca’s own work is on the astrophysical signatures of dark radiation, and here she explains why she thinks symmetry might lead to a more wonderful explanation of the universe than the mystery of fine-tuning:
Many argue that if the laws of physics had been just slightly different, life – or at least life as we know it – would not have been possible in the universe. The fundamental laws and parameters of physics seem to have conspired so as to make the formation of life possible. To many it seems as if science is pointing to a designer of the universe who set all these parameters just right for us – as if science is pointing the way to God.
Some scientists invoke a version of the “anthropic principle” to explain fine-tuning. The idea is that there are many universes (or many different patches of our universe) with different values of the fundamental parameters. It is not surprising that we live in the universe or patch with parameters that allow life. However, this argument is pretty speculative and, some would say, something of a cop out.
So where might fine-tuning come from? Why do the laws of physics seem just right for life? Has God carefully crafted and adjusted them to allow our evolution? Is God like a piano tuner, meticulously tightening the strings of the universe until everything is just so? Or did God make a piano that could never be out of tune? Does the apparent fine-tuning in the laws of physics emerge from deeper, more fundamental laws? I, along with many other physicists, think it might do, and that those deeper laws might be symmetries.
Over the past 100 years, symmetry has emerged as the principle that underpins the physical universe. For example…
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