Here are excerpts from a new book review and movie review I’ve written recently for Inside Science News Service. I have a few additional thoughts about Sean Carroll’s book, below this excerpt.
Sean Carroll’s ‘Big Picture’ Tours Physics And Philosophy
In a new book, Sean Carroll brings together physics and philosophy while advocating for “poetic naturalism.”
Quantum physics, cosmology, existentialist philosophy and morality may seem like disparate subjects. But Sean Carroll, a theoretical physicist at Caltech, ties them all together into a cohesive and comprehensive worldview he calls “poetic naturalism.” He lays out his views while trying to find meaning in a vast and chaotic universe in his newly published book, “The Big Picture” (Dutton, Penguin Random House Inc.).
Having written two previous popular physics books as well as being active on Twitter and his blog, Carroll takes an interest in communicating complex scientific discoveries. In his new book, he describes some of the fundamental ideas in modern physics with a philosophical lens, while exploring life’s biggest mysteries: the origin of the universe and the meaning of life itself. At the same time, with references to Wile E. Coyote, Captain Kirk and “Bill and Ted’s Excellent Adventure,” he avoids an overly serious tone.
In recent years, prominent scientists like Neil deGrasse Tyson, Bill Nye and Stephen Hawking have downplayed the importance of philosophy or even denigrated it. Carroll is not among this crowd.
“There are a lot of scientists and science promoters who have said not entirely complimentary things about philosophy, but that misses the point about what it’s for,” Carroll said in an interview. “The purpose of philosophy is not to be the handmaiden of science.”
Though his Ph.D. is in physics, Carroll has a strong interest in philosophy as well, and minored in it in college. He sees philosophy as a method for interpreting science and for a deeper understanding of physical phenomena. He uses philosophical concepts such as causality, determinism and mind-body dualism to explore everything from the tiniest subatomic particles to the accelerating expansion of the universe — as well as the role humans play somewhere in between.
For Carroll, naturalism means that there’s one world, the natural world, it obeys the laws of nature, and you can discover it using science. To this he adds that “there are many ways of talking about the world,” stories that people can tell to make sense and meaning of the world and their place in it. He even address issues of free will, consciousness, ethics, and life after death…
…The situation becomes murkier when Carroll discusses quantum mechanics, the interpretation of which has continually generated debates among physicists and philosophers since Max Planck and Albert Einstein discovered light “quanta” in the early 20th century. Physicists interpret quantum systems with probabilities: for example, for a hydrogen atom, the electron doesn’t have a particular position or momentum, but if someone measures them, it has probabilities of being observed in particular states.
Carroll supports the controversial “many-worlds interpretation” in which every quantum possibility is literally a separate world (or universe). We happen to live in one of them, and we have no way of seeing or even confirming the existence of the many unobservable parallel universes. This interpretation seems to conflict with his claim of endorsing a “sparse ontology,” which would mean accepting only a few fundamental concepts for describing the natural world.
“What I took Carroll to be promoting was a kind of ‘verificationism’: what is true is what can be measured,” said Elise Crull, philosopher of science at the City College of New York. “But what counts as ‘measurable,’ and how we distinguish theoretical from observational statements, are complex issues.” This is why, she argues, philosophers considered the view problematic and abandoned it long ago…
[For more, check out the entire story in Inside Science, published on 19 May 2016. Thanks to Chris Gorski and Emily DeMarco for editing assistance.]
I think Carroll’s book does a great job of tying together so many disparate concepts, and I commend his efforts to communicate philosophical ideas. It’s important to encourage people to think and talk about “what it all means.” However, I think Carroll comes across as a little overconfident sometimes, as if he has all the answers. (But he’s more modest at other times.) Furthermore, he’s clearly more of an expert on the physics than the philosophy. His philosophical views don’t seem very nuanced or even self-consistent, and his book lacked a discussion of some important questions. (Exactly what are “laws” of nature and what do they tell us about how things actually behave? How do we assess the simplicity or predictive or explanatory power of a scientific theory?) He also missed some influential philosophers and physicists who have studied “scientific realism” in the context of cosmology and quantum physics for decades.