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Is the fine-tuning of physical constants evidence for design?

Omar Ragab Fellow
· 4 replies
Physics & cosmologyAnalytic#design-argument#fine-tuning
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Physicists say that if some constants of nature, like the strength of gravity or the cosmological constant, were even slightly different, no stars, chemistry or life could exist. Some philosophers and theologians say this is strong evidence of a designer.

Others respond with the anthropic principle: of course we find ourselves in a universe compatible with our existence. Others appeal to a multiverse.

I find the probabilistic arguments hard to evaluate. Is fine-tuning evidence for design, and if not, why not?

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4 answers

  1. Emeka Anyaoha

    Fellow

    Fine-tuning is real as a feature of our current theories; physicists don't dispute it. What's disputed is whether we know the "probability" of the constants having their values. We have only one universe, and no theory telling us what values were possible. Without that, the probabilities are hard to define.

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  2. Tomasz Szewczak

    Fellow

    There's also the "inverse gambler's fallacy" objection to multiverse responses, pressed by Ian Hacking: observing a fine-tuned universe doesn't make it more probable that there are many others, just as seeing double sixes doesn't make it more likely the dice have been thrown many times before.

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  3. Pieter van Dijkhuizen

    Fellow

    The anthropic answer has always seemed to me a bit like the firing squad case: fifty marksmen all miss you. "Of course you observe that you survived" is true but you'd still want an explanation.

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    1. Omar Ragab

      Fellow

      Pieter, that's John Leslie's example, I think. It's the one that keeps me taking the argument seriously.