from: The NY Sun, September 27, 2006
Six Numbers in Search of a Theory
BY MICHAEL SHERMER
As the public spokesperson for the Skeptics Society and Skeptic magazine, I participate in a series of collegiate debates around the country with theologians and intelligent design advocates on the existence (or lack thereof) of a deity or intelligent designer, which may or may not be one and the same. In my opinion, the single best argument my debate opponents have is the apparently fine-tuned characteristics of nature. Indeed, they quote no less a personage than Sir Martin Rees, Britain's Astronomer Royal, who argues in his 2000 book, "Just Six Numbers," that "our emergence from a simple Big Bang was sensitive to six ‘cosmic numbers.' Had these numbers not been ‘well tuned,' the gradual unfolding of layer upon layer of complexity would have been quenched." These six numbers are:
Change these relationships, and stars, planets, and life could not exist. Thus, this is not just the best of all possible worlds, it is the only possible world.
One answer to this argument comes from string theory, which holds that the fundamental constituents of matter are vibrating strings of extremely small scale, perhaps even at the unimaginably small Planck length, or 10-35 meters. According to one model of string theory, there could be 10500 possible universes, all with different self-consistent laws and constants. That's a 1 followed by 500 zeroes possible universes (12 zeroes is a trillion!). Also, through string theory there may be an underlying principle behind all the fine-tune equations and relationships that will be forthcoming when the grand unified theory of physics is discovered. In a unified theory there will not be six mysterious numbers, there will just be one.
For many years now I have invoked string theory as my authority from whence this unification may come. I may now have to look for another source. According to two new books, there is much to be skeptical about in string theory.
In "Not Even Wrong" (Basic Books, 291 pages, $26.95), the Columbia University mathematician Peter Woit invokes Wolfgang Pauli's famous critique of a paper: "This isn't right. It's not even wrong." String theory, Mr. Woit argues, is not only based on nontestable hypotheses, it depends far too much on the aesthetic nature of its mathematics and the eminence of its proponents. In science, if an idea is not falsifiable, it is not that it is wrong; it is that we cannot determine if it is wrong, and thus it is not even wrong. In an engaging, albeit challenging, narrative, Mr. Woit recounts the history of string theory, concluding: "Since 1973, the field has failed to make significant progress, and in many ways has been the victim of its own success."
Mr. Woit is not alone. No less a physics god than the late Caltech Nobel physicist Richard Feynman cautioned, "Now I know that other old men have been very foolish to say this is nonsense. I am going to be very foolish, because I do feel strongly that this is nonsense! I can't help it, even though I know the danger in such a point of view. So perhaps I could entertain future historians by saying I think all this superstring stuff is crazy and is in the wrong direction." More succinctly, Feynman quipped: "String theorists don't make predictions, they make excuses." What did he mean by this stinging rebuke?
That was in 1987. According to Mr. Woit, not much has changed since. Echoing Feynman, Mr. Woit concludes: "The fundamental reason that superstring theory makes no predictions is that it isn't really a theory, but rather a set of reasons for hoping that a theory exists."
If anyone would be sympathetic to the struggles of bringing to fruition a revolutionary idea like string theory it would be Lee Smolin, the Yale University and Pennsylvania State University physicist who went on to co-found the innovative Perimeter Institute of Theoretical Physics, located in Quebec and "dedicated to extending theories of space, time and matter." In "The Trouble with Physics" (Houghton Mifflin, 392 pages, $26), Mr. Smolin argues that string theory has unjustly used up a disproportionate amount of time, resources, money, and young physicists, which, at this point, could be put to better use on other topics that have a better chance of bearing experimental fruit. "String theory now has such a dominant position in the academy that it is practically career suicide for young theoretical physicists not to join the field."
The failure of string theory "is not so much a particular theory but a style of doing science that was well suited to the problems we faced in the middle part of the twentieth century but is ill suited to the kinds of fundamental problems we face now." According to Mr. Smolin, there are five such fundamental problems for which we need a new style of science to solve:
"These five problems represent the boundaries to present knowledge. They are what keep theoretical physicists up at night. … Any theory that claims to be a fundamental theory of nature must answer each one of them." String theory, says Mr. Smolin, has failed to do so.
Yet, for Mr. Smolin, the deeper problem is not string theory per se; it is in the social structure of science itself. In a penultimate chapter on "how science really works," Mr. Smolin sings the praises of thinking outside of the box, including and especially the staid and delimiting box of academia. The system is set up to create scientists who are risk-averse, and granting tenure doesn't help: "Too much job security, too much power, and too little accountability for older people. Too little job security, too little power, and too much accountability for younger people in the prime of their creative, risk-taking years."
Mr. Smolin concludes that we must do two things: "We must recognize and fight the symptoms of groupthink, and we must open the doors to a wide range of independent thinkers, being sure to make room for the peculiar characters needed to make a revolution." How can you spot one of these young revolutionaries? Easy. Find someone already doing science this way, or "find at least one accomplished person in the candidate's field who is deeply excited about what the candidate is trying to do," and, just to be sure, "find at least one professor who thinks the candidate is a terrible scientist and bound to fail."
This brings to mind the first of Arthur C. Clarke's famous three laws: "When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong."
But is he not even wrong?