I’ve just finished with Time Reborn. I wasn’t expecting to be converted to Smolin’s proposition that time is real rather than constructed. I enjoyed the book, and he provided a solid foundational understanding of the conventional scientific perspective (circa 2013, when the book was published).
I understand that Smolin is a professional physicist with a PhD and his grasp of the fundamentals is solid, and I am a peripheral scientist at best. I fully grant that I may be on the left of the Dunning-Kruger curve and making rookie mistakes.
The biggest contention I have is that he insists that everything needs to have a reason, citing Leibnitz. His argument is based on the question of why is our universe so perfectly structured, that it would be improbable to have happened purely by chance.
Whilst I agree that everything has a cause, reasons are an artifice imposed by humans. In practice, where reasons don’t exist, we make them up. This is how we get false theories and gods. Smolin does discuss false theories of the past and attempts to claim that the prevailing theories occupy this space whilst his theory should replace it.
Any universe created without the ability to sustain life would not have us asking why it did not support life.
My reaction is that it just is. Whether Roger Penrose is correct in saying that the universe is continually recreated and destroyed, rinse and repeat, the reason the universe is constructed in such an (improbably) ordered fashion that can sustain life is that there is no reason. Any universe created without the ability to sustain life would not have us asking why it did not support life. It does. We are here to question, and so we do. End of story.
We can make up all sorts of stories, whether through science, religion, or some other origin myth. None of them is provable. As Smolin notes, this is a one-time event. If it is destroyed, so are we and our memories. If life is sustainable in a future—or even parallel—configuration, we’re sent back to start where we can fabricate new stories.
Perhaps in another universe, it will be configured so differently that some other sort of life is created, perhaps this life will not be DNA-based and be anaerobic? Who knows?
It seems that he has an interest in reserving a place for human agency, which has little room for movement in current scientific models. His model provides this room. Moreover, he further thinks that even in current models, human agency should be injected into the models. I suppose he is not familiar with Keynes’ animal spirits.
For some reason, he decided to devote the final chapter to the hard problem of consciousness. This was a particularly hot topic around that time, so he didn’t want to miss the boat. The long and the short of it, he didn’t think the qualia-consciousness answer would be found through physics—though he reserved that there was a non-zero probability that it could be. He posits this as an existential, experiential challenge, and science is not designed to address such affairs.