- Fine-tuned Universe
The fine-tuned Universe is the idea that the conditions that allow
lifein the Universecan only occur when certain universal physical constants lie within a very narrow range, so that if any of several fundamental constants were only slightly different the universe would be unlikely to be conducive to the establishment and development of matter, astronomical structures, elemental diversity, or life as it is presently understood. cite web |url=http://www.talkorigins.org/indexcc/CI/CI301.html |title=CI301: The Anthropic Principle |accessdate=2007-10-31 |author=Mark Isaak (ed.) |date=2005 |work=Index to Creationist Claims |publisher= TalkOrigins Archive]
arguments relating to the fine-tuned universe concept involve the anthropic principle, which states that any valid theory of the universe must be consistent with our existence as human beings at this particular time and place in the universe. In other words, even if the actual probability of our universe that supports intelligent life may be very low, the conditional probabilityof supporting intelligent life, given our existence in it, is 1. Even if there could be other universes, less "fine-tuned" and so devoid of life, there would be no one there to observe them.
The premise of the fine-tuned universe assertion is that a small change in several of the approximately 26
dimensionless fundamental physical constants would make the universe radically different: if, for example, the strong nuclear force were 2% stronger than it is (i.e. if the coupling constantrepresenting its strength were 2% larger), diprotons would be stable and hydrogen would fuse into them instead of deuteriumand helium. This would drastically alter the physics of stars, and presumably prevent the universe from developing life as it is currently observed on the earth. However, many of the 26 constants describe the properties of the unstable strange, charmed, bottom and top quarksand mu and tau leptonswhich seem to play little part in the universe or the structure of matter.
Larry Abbott wrote: "the small value of the cosmological constant is telling us that a remarkably precise and totally unexpected relation exists among all the parameters of the Standard Model of particle physics, the bare cosmological constant and unknown physics." [Larry Abbott, "The Mystery of the Cosmological Constant," Scientific American, vol. 3, no. 1 (1991): 78; quoted in Michael A Corey, "The God Hypothesis: Discovering Divine Design in Our Goldilocks Universe" Rowman and Littlefield, 2001. [http://books.google.com/books?id=-4lMfNGivg0C&pg=PA84&lpg=PA84&vq=remarkably&dq=fine-tuned-universe+remarkably-precise&sig=vrfl2W1u2Eivpeh7k54uSNBdp4Q online] ] Victor Stenger has suggested that the fine-tuned universe concept can be interpreted as a "claim of evidence for divine cosmic plan": "As the argument goes, the chance that any initially random set of constants would correspond to the set of values that we find in our universe is very small and the universe is exceedingly unlikely to be the result of mindless chance. Rather, an intelligent, purposeful Creator must have arranged the constants to support life". Stenger in that paper is critical of the claims of the fine-tuning advocates and provides his own explanations highlighting the flaws in those claims and concludes that "The universe is not fine-tuned for humanity. Humanity is fine-tuned to the universe". [http://www.colorado.edu/philosophy/vstenger/Cosmo/FineTune.pdf#search=%22Fine%20tuned%20universe%22 Is The Universe Fine-Tuned For Us?] Victor J. Stenger, University of Colorado.]
As modern cosmology developed, various hypotheses have been proposed. One is an
oscillatory universeor a multiversewhere physical constants are postulated to resolve themselves to randomvalues in different iterations of reality. Therefore separate parts of reality would have wildly different characteristics. In such scenarios the issue of fine-tuning does not arise at all, as only those "universes" with constants hospitable to life (such as what we observe) would develop life capable of asking the question.
There are fine tuning arguments that are naturalistic, [L. Susskind, "The cosmic landscape: string theory and the illusion of intelligent design". (Little, Brown, 2005).] however, the assertion that the universe was designed to be fine-tuned is largely put forward by advocates of
intelligent designand other forms of creationism. This apparent fine-tuning of the universe is citedWilliam Lane Craig, "The Teleological Argument and the Anthropic Principle," [http://www.leaderu.com/offices/billcraig/docs/teleo.html] ] by William Lane Craigas an evidence for the existence of Godor some form of intelligence capable of manipulating (or designing) the basic physicsthat governs the universe. Craig argues, however, "that the postulate of a divine Designer does not settle for us the religious question." Alvin Plantingaargues that "random chance", applied to a single and sole universe, only raises the question as to why this universe could be so "lucky" as to have precise conditions that support life at least at some place (the Earth) and time (within millions of years of the present). [Alvin Plantinga, Books & Culture, March/April 2007 Issue [http://www.christianitytoday.com/bc/2007/002/1.21.html] ]
Based upon the
Anthropic principle, physicist Robert H. Dickeproposed the "Dicke coincidence" argument that the structure (age, physical constants, etc) of the universe as seen by living observers is not random, but is constrained by biological factors that require it to be roughly a "golden age". [cite journal | authorlink = Robert Dicke |author = Dicke, R. H. | journal = Nature | title = Dirac's Cosmology and Mach's Principle | volume = 192 | pages = 440–441| year = 1961 | doi = 10.1038/192440a0]
Critics argue that the fine-tuned universe assertion and the anthropic principle are essentially tautologies. [See, e.g., [http://www.nature.com/nature/journal/v443/n7108/full/443145a.html Our place in the Multiverse] Joseph Silk. Nature, Volume 443 Number 7108, September 14 2006.] The fine-tuned universe argument has also been criticized as an
argument by lack of imaginationbecause it assumes no other forms of life, based upon alternative biochemistry, are possible. In addition, critics argue that humans are adapted to the universe through the process of evolution, rather than the universe being adapted to humans. They also see it as an example of the logical flaw of hubrisor anthropocentrismin its assertion that humans are the purpose of the universe. ["See, e.g.," Gerald Feinberg and Robert Shapiro, "A Puddlian Fable" in Huchingson, "Religion and the Natural Sciences" (1993), pp. 220-221]
Nature of the constants
scienceas practiced since René Descartesis reductionist, meaning that it attempts to discover the most fundamental objects and rules governing the observable behavior of the universe. In descriptions of the physical universe, fundamental rules take the form of laws (usually equations relating physical quantities and properties) involving physical constants, while the fundamental objects are elementary particles with constant mass, charge, and other physical properties. This reductionism is a pragmaticapproach that obtains results and is not a philosophicalposition on ontology. The nature of these constants is a much debated topic in physicsand metaphysics(see string theory).
Meaning of "universe"
Both popular and professional research articles in cosmology often use the term "
universe" to refer to the observable universe. The reason for this usage is that only observable phenomena are scientifically relevant. Since unobservable phenomena have no perceptible effects, physicists argue that they "causally do not exist". Since unobservable parts of the universe cannot be measured, hypotheses about them are not testable, and thus inappropriate for a scientific theory.
All the arguments that refer to the
observable universewould not necessarily apply to the unobservable parts of reality sometimes called "other universes", if such there be. Although our observable universe has the parameters necessary for carbon based life, other parts of a larger multiverse may be sterile, or may have physical parameters conducive to different types of life or other, possibly self-aware, systems.
Disputes on the existence of fine-tuning
There are many cases where the known physical constants are argued to suggest fine tuning. However, the validity of these examples is sometimes questioned on the grounds that such reasoning is subjective
anthropomorphismapplied to natural physical constants. For example, Victor Stengerwrites that "...The fine-tuning argument and other recent intelligent designarguments are modern versions of God-of-the-gaps reasoning, where a God is deemed necessary whenever science has not fully explained some phenomenon.". Victor Stenger furthers his critical view that "...a wide variation of constants of physics leads to universes that are long-lived enough for life to evolve, although human life need not exist in such universes".
Fine-tuning, Stenger argues, comes with caveats. The fact that a universe with different physical constants might be inhospitable to life as we know it does not necessarily mean that it is inhospitable to any form of life. Currently, there is no way of determining if a universe allows for life or not. Further, most of this universe, especially the interstellar vacuum, appears to be devoid of life; other physical constants may exist that allow a much greater density of life than in this universe.
Stenger suggests that there could be exotic life with “different configurations of laws and constants of physics” [http://www.colorado.edu/philosophy/vstenger/Cosmo/anthro_skintel.html] . Life could perhaps have developed based on different chemicals. Life could be based on silicon or other carbon-like
chemical elements, though carbonseems better suited.
He has also written:
If it is accepted that the universe is fine-tuned, there are a number of naturalistic explanations that attempt to account for it.
The Multiverse hypothesis assumes the existence of many universes with different physical constants, some of which are hospitable to intelligent life. See The multiverse and the anthropic principle. Because we are intelligent beings, we are by definition in a hospitable one. This approach has led to considerable research into the
anthropic principleand has been of particular interest to particle physicists because theories of everything do apparently generate large numbers of universes in which the physical constants vary widely. As of yet, there is no evidence for the existence of a multiverse, but some versions of the theory do make predictions which some researchers studying M-theoryand gravity leaks hope to see some evidence of soon."Parallel Worlds",2005, Michio Kaku, pp. 220-221] The existence of additional universes in a multiverse, other than the observable universe, is not falsifiable, thus some are reluctant to call the multiverse idea a "scientific" idea. UNC-Chapel Hill professor Laura Mersini-Houghton claims that the WMAP cold spot may provide testable empirical evidence for a parallel universe.
Variants on this approach include the notions of
Cosmological natural selection, the Ekpyroticuniverse, and the Bubble universe theory.
Bubble universe theory
The bubble universe model by physicist
Andrei Linde, postulates that our universeis one of many that grew from a multiverseconsisting of vacuumthat had not yet decayed to its ground state.
quote|According to this scenario, by means of a random quantum fluctuation the universe "tunneled" from pure vacuum ("nothing") to what is called a false vacuum, a region of space that contains no matter or radiation but is not quite "nothing." The space inside this bubble of false vacuum was curved, or warped. A small amount of energy was contained in that curvature, somewhat like the energy stored in a strung bow. This ostensible violation of energy conservation is allowed by the Heisenberg uncertainty principle for sufficiently small time intervals.
The bubble then inflated exponentially and the universe grew by many orders of magnitude in a tiny fraction of a second. (For a not-too-technical discussion, see Stenger 1990). As the bubble expanded, its curvature energy was converted into matter and radiation, inflation stopped, and the more linear big bang expansion we now experience commenced. The universe cooled and its structure spontaneously froze out, as formless water vapor freezes into snowflakes whose unique patterns arise from a combination of symmetry and randomness.|
Victor J. Stenger|The Anthropic Coincidences [http://www.colorado.edu/philosophy/vstenger/Cosmo/anthro_skintel.html The Anthropic Coincidences] ]
In standard inflation, inflationary expansion occurred while the universe was in a
false vacuumstate, halting when the universe decayed to a true vacuum state. The "bubble universe" model proposes that different parts of this inflationary universe (termed a Multiverse) decayed at different times, with decaying regions corresponding to universes not in causal contact with each other. It further supposes that each bubble universe may have different physical constants.
The Universe may have been designed by an alien or by aliens. This would solve the problem of how a designer or design team capable of fine-tuning the Universe could come to exist. Leading
cosmologist, Alan Guthbelieves humans will in time be able to generate new universes. By implication previous intelligent entities may have generated our universe.
This idea leads to the possibility that the extraterrestrial designer/designers are themselves the product of an evolutionary process in their own universe, which must therefore itself be able to sustain life. For instance,
Richard Dawkinswrites:Dawkins maintains that an alien designer or designers are more plausible than a supernatural designer or designers because there is a known mechanism to produce them. He calls it the “crane” of Natural selection.
Simulation hypothesispromoted by Nick Bostromand others have suggests that our universe may be a computer simulation by aliens.
The Biocosm hypothesis and the
Meduso-anthropic principleboth suggest that natural selectionhas made the universe biophilic. The universe enables intelligence because intelligent entities later create new biophilic universes. This is different from the suggestion above that aliens from a universe which is less finely tuned than ours made our universe finely tuned.
Counterarguments to Naturalistic Hypotheses
Critics of the multiverse-related explanations argue that there is no evidence that other universes exist, or that these universes necessarily exhaust all possible physical properties as the anthropic principle requires. Against the specific Bubble universe Hypothesis described above, Craig argues "Inflationary models not only face the problems of how to get the inflation started, how to get it to end without excess turbulence, and how to get it to allow galaxy formation, but more importantly they themselves require an extraordinary amount of fine-tuning prior to inflation, so that the appearance of design is not eluded".
theistic evolution, some individual scientists, theologians, and philosophers as well as certain religious groups have seized on the idea that providence or creation are responsible for fine-tuning. Intelligent design theories are not necessarily falsifiable, and thus some are reluctant to call intelligent design theories a "scientific" idea.Variants on this approach include:
Intelligent designargue that certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection. The fine-tuned universe argument is a central premise or presented as a given in many of the published works of prominent Intelligent Design proponents, such as William A. Dembskiand Michael Behe.
Other religious creation views
Most religions have some kind of account of the creation of the universe, although they generally differ in detail from the ones listed above. Some of these may be fully compatible with known scientific facts (notwithstanding their use of metaphysical ideas which are beyond the domain of science). For example scientist-theologians such as
John Polkinghorneemphasise the implications of "Anthropic Fine-Tuning" within an orthodox Christian framework whilst fully accepting the scientific findings about Evolution and the age of the Universe. This is also the position of the Roman Catholic Churchand of most Anglicantheologians, of whom Alister McGrathis probably the most prolific in this area. [ see eg his 3-volume "Scientific Theology" and his shorter book "The Science of God"] The Jewish physicist Gerald Schroederargues that the apparent discrepancy between the "days" in Genesis and the billions of years in a scientific understanding are due to the differences in frames of reference. Many other religious creation views are either incompatible with, or indifferent to, scientific understandings. Other scientists with similar views are physicist Freeman Dysonand astronomer Owen Gingerich.
Counter argument to religious views
The "argument from imperfection" suggests that if the universe were designed to be fine-tuned for life, it should be the best one possible and that evidence suggests that it is not. [Avitel Pilpel, SKEPTIC, November 2007 Issue, p.18] In fact, most of the universe is highly hostile to life.
An implication of intelligent design may be that the designer is benevolent and, as such, the constants and structures of the universe are "life-friendly". However such intelligent designer may conceivably be malevolent. quote|(…) it is reasonable to conclude that God does not exist, since God is omnipotent, omniscient and perfectly good and thereby would not permit any gratuitous natural evil. But since gratuitous natural evils are precisely what we would expect if a malevolent spirit created the universe (…). If any spirit created the universe, it is malevolent, not benevolent.
Quentin Smith|The Anthropic Coincidences, Evil and the Disconfirmation of Theism [ [http://www.infidels.org/library/modern/quentin_smith/anthropic.html The Anthropic Coincidences, Evil and the Disconfirmation of Theism] ]
A Bayesian probabilistic discussion by mathematician Michael Ikeda and astronomer
William H. Jefferysin 2006 argues that the traditional reasoning about intelligent design from the presence of fine-tuning does not properly condition on the existence of life and is also based on an incorrect reversal of conditional probabilities. [ [http://quasar.as.utexas.edu/anthropic.html Jefferys The Anthropic Principle Does Not Support Supernaturalism] , Michael Ikeda, Bill Jefferys] They argue that it is an example of the prosecutor's fallacy, which in this form erroneously claims that if fine-tuning is rare in naturalistic universes, then a fine-tuned universe is unlikely to be naturalistic.
The philosopher of science
Elliott Sobermakes a similar argument (2004). Richard Swinburnereaches the opposite conclusion using Bayesian probability(Swinburne 1990).
In fiction and popular culture
Stephen Baxterhas written several novels and short stories in which the setting is an alternative universe with different physical laws. The most obvious example is "Raft" in which the force of gravity is a billion times stronger than in our universe. The novel, "" of the "Manifold" sequence includes the interesting concept that the universe itself is not perfectly tuned for life to exist and is still in the process of evolution itself. The climax of the book involves the destruction of the universe so that a new version, better suited to life, may replace it.
Robert J. Sawyerdiscusses the fine-tuned universe novel at length in his Hugo Award-nominated novel "Calculating God" (2000), which features an alien race that has developed a grand unified theory that includes these conclusions (presented in dialog): quote|"First, that this universe is not flat, but rather that it is "closed": it did indeed start with a big bang and will expand for billions of years more -- but it will eventually collapse back down to a singularity in a big crunch.
"Second, that this current cycle of creation follows no more than "eight" previous big-bang/big-crunch oscillations -- we are not one in an infinitely long string of universes but, rather, are one of the very few that have ever existed."
"And the third provision of the grand unified theory is this: "no" parallel universes exist simultaneously with ours or any of the previous or subsequent ones, save virtually identical universes with exactly the same physical constants that split briefly from the current one then almost immediately reintegrate with it, thus accounting for certain quantum phenomenons.
"The math to prove all the foregoing is admittedly abstruse, although, ironically, the Wreeds intuitively came to an identical model. But the theory of everything made numerous predictions that have subsequently been confirmed experimentally; it has withstood "every" test it has been put to. And when we found that we could not retreat into the notion that this universe is one of a vast number, the argument for intelligent design became central to Forhilnor thought. Since this is one of a maximum of just nine universes that have ever existed, for it to have these highly improbable design parameters implies they were indeed chosen by an intelligence." [ [http://www.sfwriter.com/excg.htm Robert J. Sawyer, "Calculating God", Tor Books, New York 2000] ]
Sawyer also explores the fine-tuned universe argument in his short story "The Abdication of Pope Mary III," first published in "Nature: International Weekly Journal of Science", July 6, 2000.
Sphere Buildersof created the Delphic Expansein an attempt to alter the physical laws of our universe to match those of their own parallel universe. Their form of life was not compatible with the current physical laws of our universe (as evidenced by their quickly decaying bodies), and thus needed to make said changes in order to conquer and live in our universe.
Neal Stephensondiscussed the issue of fine-tuning in the conclusion to his essay In The Beginning Was The Command Line, speculating on what might happen if an all-powerful entity had access to a computer program that could generate universes with any desired set of properties.cquote|The demiurge sits at his teletype, pounding out one command line after another, specifying the values of fundamental constants of physics: :universe -G 6.672e-11 -e 1.602e-19 -h 6.626e-34 -protonmass 1.673e-27.... and when he's finished typing out the command line, his right pinky hesitates above the ENTER key for an aeon or two, wondering what's going to happen; then down it comes--and the WHACK you hear is another Big Bang. [ [http://www.cryptonomicon.com/beginning.html In The Beginning Was The Command Line] ]
John D. Barrowand Frank J. Tipler, 1986. "The Anthropic Cosmological Principle". Oxford Univ. Press. ISBN 0-19-282147-4
John D. Barrow, 2003. "The Constants of Nature", Pantheon Books, ISBN 0-375-42221-8
Nick Bostrom, 2002. "Anthropic Bias: Observation Selection Effects in Science and Philosophy", Routledge, New York, ISBN 0-415-93858-9
Paul Davies, 1982. "The Accidental Universe", Cambridge University Press, ISBN 0-521-24212-6
Michael Ikedaand William H. Jefferys, "The Anthropic Principle Does Not Support Supernaturalism," in "The Improbability of God," Michael Martin and Ricki Monnier, Editors, pp. 150-166. Amherst, N.Y.: Prometheus Press. ISBN 1-59102-381-5
Simon Conway Morris, 2003. "Life's Solution: Inevitable Humans in a Lonely Universe". Cambridge Univ. Press.
Martin Rees, 1999. "Just Six Numbers", HarperCollins Publishers, ISBN 0-465-03672-4
Elliott Sober, 2004. "The Design Argument", in The Blackwell Guide to the Philosophy of Religion, W. E. Mann, Editor. Blackwell Publishing, ISBN 0-631-22129-8
Richard Swinburne, 1990. "Argument from the fine-tuning of the universe", in Physical cosmology and philosophy, J. Leslie, Editor. Collier Macmillan: New York. pp. 154-73.
*Ward, P. D., and Brownlee, D., 2000. "Rare Earth: Why Complex Life is Uncommon in the Universe". Springer Verlag.
* [http://www.infidels.org/library/modern/quentin_smith/anthropic.html The Anthropic Coincidences, Evil and the Disconfirmation of Theism ]
* [http://www.bbc.co.uk/science/horizon/2001/parallelunitrans.shtml Parallel Universes,BBC Two 9.00pm Thursday 14 February 2002]
Origin of life
Rare Earth hypothesis
Ultimate fate of the universe
The Parable of the Solar System Model
* [http://home.messiah.edu/~rcollins/ft.htm Robin Collins's Fine-Tuning Website]
* [http://www.colorado.edu/philosophy/vstenger/Cosmo/anthro.skinq.html Does the Cosmos Show Evidence of Purpose?]
* [http://www.infidels.org/library/modern/theism/design.html#fine Fine-Tuning Argument links to online references] , at the Secular Web
* [http://academic.udayton.edu/WilliamRichards/Intro%20essays/Collins,%20Fine-tuning.htm Cosmological fine-tuning] , by Robin Collins
* [http://www.reasons.org/resources/apologetics/design.shtml?main Design and the Anthropic Principle] by Hugh Ross
* [http://quasar.as.utexas.edu/anthropic.html The Anthropic Principle Does Not Support Supernaturalism] by Michael Ikeda and Bill Jefferys
* [http://www.firstthings.com/ftissues/ft0106/articles/barr.html Overview of the Cosmological Intelligent Design argument] Stephen M. Barr. July 2001. First Things, the Journal of Religion, Culture, and Public Life.
* [http://philosophy.wisc.edu/sober/design%20argument%2011%202004.pdf The Design Argument] by Elliott Sober "(Adobe PDF format)"
* [http://www.templeton.org/biochem-finetuning/purpose.html Home page of Templeton Foundation project on fine-tuning]
* [http://bayesrules.net/papers/ockham.pdf Sharpening Ockham's razor on a Bayesian strop] by William H. Jefferys and James O. Berger "(Adobe PDF format)"
* [http://www.talkorigins.org/indexcc/CI/CI301.html The cosmos is fine-tuned to permit human life] at the talk.origins index to creationist claims.
* [http://www.colorado.edu/philosophy/vstenger/Cosmo/FineTune.pdf Is the Universe fine-tuned for us?] "(Adobe PDF format)"
* [http://www.berkeley.edu/news/media/releases/2005/06/17_townes.shtml Interview] with
Charles Townesdiscussing science and religion.
* [http://doesgodexist.com/Charts/EvidenceForDesignInTheUniverse.html Evidence For Design In The Universe]
* [http://www.geraldschroeder.com/tuning.html Gerald Schroeder's Fine-turned universe page]
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