Multiverse mania seems to have been dying down recently, with this only the third entry in that category here so far this year, after 10 in 2018, 13 in 2017, 10 in 2016, 17 in 2015, 18 in 2014, 12 in 2013, 9 in 2012, 15 in 2011. Bringing up the rear (hopefully…) is The Number of the Heavens, Tom Siegfried’s new book out today from Harvard University Press.
Siegfried is about the worst of the many journalists covering fundamental physics that I’ve run into over the years (only real competition is K.C. Cole). For some of his efforts as a journalist over the years, see here, here, here, here, here, and here. It’s not surprising that his multiverse book is an atrocious piece of propaganda.
It’s basically a compendium of arguments for string theory and the multiverse, with a bit of extra history tacked on. You get to read long sections of all the usual pro-string landscape and multiverse arguments from the usual suspects: Carroll, Deutsch, Guth, Greene, Linde, Polchinski, Rees, Susskind, Tegmark, and Weinberg. There’s the usual chapter on the MWI, ending with the acknowledgement that this has nothing at all to do with what the rest of the book is about. There’s a chapter about the glories of supersymmetry, brane-world scenarios, nothing about negative results from the LHC.
The way Siegfried handles criticism of string theory, etc. is very simple: pretend it doesn’t exist. As far as I can tell, there’s nothing anywhere in the book that even acknowledges that there’s another side to this story: for instance, no Baggott, Hossenfelder, Smolin, Penrose, or any reference to any book at all critical of string theory or multiverse hype. While there’s zero criticism of string theory, there are, as far as I can tell, just two appearances of multiverse critics:
- On pages 223-8, remarks by Burt Richter at a panel discussion in 2006 get two paragraphs, followed by four pages of arguments from Linde, Susskind, Polchinski and Carroll explaining why he’s wrong. The prominent multiverse critic David Gross makes a brief appearance in these pages, with no mention of the fact that he is a multiverse critic.
- Pages 262-9 are labeled a section on “Multiverse Deniers”, but there’s only one multiverse denialist quoted, George Ellis, with the only source given for his arguments this paper. In these pages short excerpts of his arguments are interleaved with long explanations from the author (as well as Weinberg, Wilczek, Carroll, Donoghue and Rees) about why Ellis is wrong.
Th one thing I can’t figure out about this book is how it got to be published by a reputable university press. My understanding has always been that university presses have some commitment to ensuring scholarly excellence in what they publish, for instance by having a manuscript about a controversy reviewed by experts from both sides. That obviously can’t have happened in this case, so I must be mistaken about how places like Harvard University Press now operate.