The Fine-Tuning of Our Universe

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Some cosmologists use anthropic reasoning to explain the fine-tuning of our universe. The idea is that there are a number of different parameters and constants that seem to have values that permit intelligent life to exist, obviously. But also to be said, that had the value been very different, no observers would have existed. And nevertheless, all observers would find themselves in the universe that was fine-tuned.

Human civilization is only a few thousand years old (depending on how we count). So if civilization will ultimately last for millions of years, it could be considered surprising that we’ve found ourselves so early in history. Should we therefore predict that human civilization will probably disappear within a few thousand years? This “Doomsday Argument” shares a family resemblance to ideas used by many professional cosmologists to judge whether a model of the universe is natural or not. Philosopher Nick Bostrom is the world’s expert on these kinds of anthropic arguments. We talk through them, leading to the biggest doozy of them all: the idea that our perceived reality might be a computer simulation being run by enormously more powerful beings.

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Nick Bostrom received his Ph.D. in philosophy from the London School of Economics. He also has bachelor’s degrees in philosophy, mathematics, logic, and artificial intelligence from the University of Gothenburg, an M.A. in philosophy and physics from the University of Stockholm, and an M.Sc. in computational neuroscience from King’s College London. He is currently a Professor of Applied Ethics at the University of Oxford, Director of the Oxford Future of Humanity Institute, and Director of the Oxford Martin Programme on the Impacts of Future Technology. He is the author of Anthropic Bias: Selection Effects in Science and Philosophy and Superintelligence: Paths, Dangers, Strategies.

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