Tag Archives: anthropic principle

Fine-tuning fallacies

In Fiddling with “fine-tuning” I discussed the way theologians and philosophers of religion have used claims of fine-tuning of the cosmological constant erroneously. That they have taken the fact that the value of the measured cosmological constant is 120 orders of magnitude different to the value of vacuum energy used to explain it. This has been described as the “worst calculation in physics history.” But never mind, these apologists have just utilised the huge mistake to claim that the cosmological constant is fine-tuned to 1 part in 10120! So there god must be responsible.

This is what happens when you use scientific knowledge opportunistically. Like a drunk uses a lamppost – more for support than illumination. Because the problem with the theological approach is that there is no interest in understanding the world around us – just in using science to support any argument they can drag up to “prove” the existence of their particular god.

Mind you, some non-theists also find the fine tuning concept beguiling. And they can also uncritically accept some of the fine-tuning claims that circulate. The idea that many of the physical and cosmological constants in our universe are extremely delicately balanced to values necessary for life to exist. The so-called anthropic principle.

So, Victor Stenger’s new book The Fallacy of Fine-Tuning: Why the Universe Is Not Designed for Us will be very useful for anyone attempting to check out these arguments by actually considering the science. He describes the physical and cosmological background to the constants, or parameters as he prefers to call them, usually used in fine-tuning arguments. And then he considers, one by one, just how valid – or invalid – the fine-tuning arguments are.

Here I will just deal with two “fine-tuned” constants – the “Hoyle resonance” for carbon nuclei and the “nuclear efficiency.” I think they illustrate two common mistakes made in estimating the degree of fine-tuning.

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Fine tuning argument

More and more I hear the apparent “fine-tuning” of the universe being given as an argument to “prove” existence of a god. This goes along the lines that there are a number of critical physical constants underlying the nature of our universe. If either of these had even slightly different values our universe would be very different. Stars and galaxies would not form. Carbon would not be manufactured in the stars and hence life would not occur.

Proponents of this “proof” argue that the chance of our universe having physical constants with these values is impossibly small. Therefore there must have been a divine intelligence to ensure our universe has physical constants with the measured values.

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