Hal wrote (addressing the anthropic principle): >...Tegmark writes about > this at http://www.hep.upenn.edu/~max/toe.html. He shows a chart of > two physical constants and how if they had departed from their observed > values by even a tiny percentage, life would be impossible. >... > So why is this? Why does it turn out that our form of life (or perhaps, > any form of life) can exist for only a tiny range of variation?
Hal put his finger on the right view: "our form of life" - exactly the opposite of what is ubiquitously said. 'These' parameters resulted in an existence in the format how WE are, while any other set of parameters might have results in OTHER formats, unknown, even unrecognized by us (maybe unobservable by our sensors/logic). So I reverse the anthropic principle into: "our form of life required exactly the parameters we found in our observations". Hal's parenthesis includes the big 'if' I wrote as a possible unobservability by us. A major question, of course, is the identification of 'life', for which biologists and philosophers/psychologists have different formulations from Hal's: >...Self-aware subsystems...< which sounds good to begin with, but may go into volumes if examined in detail. I try to cut off my identifications from a fundamentally human way of viewing/acting, leaving open totally different 'main' systems for such subsystem. Including (human-style?) self-awareness. The "responses" discovered in our physical and chemical mechanisms are very numerous, I don't know why it would be impossible to have a (more complex, or just different) system where such response-mechanisms include as well the domains which WE assign to the 'intelligent mind'? (Please, do not try to put this into OUR societal, even biological circumstances. It is not a 'just changed' "us"). Best regards John Mikes ----- Original Message ----- From: "Hal Finney" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, January 09, 2004 6:24 PM Subject: Peculiarities of our universe > There are a couple of peculiarities of our universe which it would be > nice if the All-Universe Hypothesis (AUH) could explain, or at least > shed light on them. > > One is the apparent paucity of life and intelligence in our universe. > This was first expressed as the Fermi Paradox, i.e., where are the aliens? > As our understanding of technological possibility has grown the problem > has become even more acute. It seems likely that our descendants > will engage in tremendous cosmic engineering projects in order to take > control of the very wasteful natural processes occuring throughout space. > We don't see any evidence of that. Similarly, proposals for von Neumann > self reproducing machines that could spread throughout the cosmos at a > large fraction of the speed of light appear to be almost within reach > via nanotechnology. Again, we don't see anything like that. > > So why is it that we live in a universe that has almost no observers? > Wouldn't it be more likely on anthropic grounds to live in a universe > that had a vast number of observers? > > The second peculiarity is the seemingly narrow range of physical laws > which could allow for our form of life to exist. Tegmark writes about > this at http://www.hep.upenn.edu/~max/toe.html. He shows a chart of > two physical constants and how if they had departed from their observed > values by even a tiny percentage, life would be impossible. In the > full paper linked from there he offers many more examples of physical > paramters which are fine-tuned for life. > > So why is this? Why does it turn out that our form of life (or perhaps, > any form of life) can exist for only a tiny range of variation? > Why didn't it turn out that you could change many parameters a great > deal and still have life form? > > I don't see anything a priori in the AUH that would have led to this > prediction. Now, it may just be one of those things that "happens to > happen", a fundamental mathematical property like the distribution of > primes or the absence of odd perfect numbers. Self-aware subsystems > just mathematically turn out to only be possible in a very tiny region > of parameter space. > > Now, you might be able to make the argument that "tiny" is not well > defined, that there is no natural length scale for judging parameter > ranges. Tegmark could as easily have zoomed in on the appropriate region > of his graph and shown a huge, enormous area where parameters could be > moved around and life would still work. > > However I think there is a more natural way to put the question, which is, > what fraction of computer programs would lead to simulated universes that > include observers? And here, if we follow Tegmark's ideas, the answer > appears to be that it is a very small fraction. (Of course, you still > need to use your own judgement to decide whether that is "tiny" or not.) > > In a way, then, these two questions are both related, and perhaps the > same. They both ask, why so few observers? One question looks around the > interior of our universe, and the other looks at the set of all universes. > In each case, it seems that intelligent life is terribly uncommon. > > Hal Finney