The book A Fortunate Universe: Life in a Finely Tuned Cosmos
(Cambridge University Press, 2016, Fig.1), by Geraint F. Lewis and Luke A. Barnes, is one of the most recent and comprehensive books on the fine tuning of the physical laws of our universe. Last month, I reviewed the first six chapters of the book in which they summarized current thinking on the subject. In this article, I’ll review the final two chapters. These chapters give Lewis and Barnes’s views on the various responses to fine tuning they have encountered from people who have read their book or heard them speak. They also lay out their own personal interpretations of fine tuning.
The first six chapters of the book explained how the fine tuning of physics is seen in the masses, electrical charges, and spins of elementary particles; the four elementary forces; the number and type of dimensions in our universe; the geometry of space-time; and the various symmetries and constants associated with physical laws. We also touched upon quantum mechanics, wave-particle duality, coupling constants, radioactivity, the Big Bang, inflation, nucleosynthesis, and more. We now turn to what people think about fine tuning.
Chapter 7: A Dozen (or so) Reactions to Fine Tuning
Here are several common responses the authors have encountered to fine tuning.