The Goldilocks Enigma
- Paul Davies has discussed fine-tuning at length, and in his book The Goldilocks Enigma (2006) he summarises the current state of the debate in detail. He concludes by enumerating the alternative responses:
- A - The absurd universe - It just happens to be that way.
- B - The unique universe - There is a deep underlying unity in physics which necessitates the universe being this way. Some 'Theory of Everything' will explain why the various features of the Universe must have exactly the values that we see.
- C - The multiverse - Multiple Universes exist which have all possible combinations of characteristics, and we naturally find ourselves within the one that supports our existence.
- D - Intelligent Design - An intelligent Creator designed the Universe specifically to support complexity and the emergence of Intelligence.
- E - The life principle - There is an underlying principle that constrains the universe to evolve towards life and mind.
- F - The self-explaining universe - A closed explanatory or causal loop: 'perhaps only universes with a capacity for consciousness can exist'.
- G - The fake universe - We are living in a virtual reality simulation.
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