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Politics : PRESIDENT GEORGE W. BUSH -- Ignore unavailable to you. Want to Upgrade?


To: J_F_Shepard who wrote (213431)12/30/2001 5:32:35 PM
From: gao seng  Read Replies (1) | Respond to of 769670
 
It is irrational not to believe in a divine creator.

Book IV - Chapter X
John Locke
Of our Knowledge of the Existence of a God
ilt.columbia.edu.
1. We are capable of knowing certainly that there is a God. Though God has given us no innate ideas of himself; though he has stamped no original characters on our minds, wherein we may read his being; yet having furnished us with those faculties our minds are endowed with, he hath not left himself without witness: since we have sense, perception, and reason, and cannot want a clear proof of him, as long as we carry ourselves about us. Nor can we justly complain of our ignorance in this great point; since he has so plentifully provided us with the means to discover and know him; so far as is necessary to the end of our being, and the great concernment of our happiness. But, though this be the most obvious truth that reason discovers, and though its evidence be (if I mistake not) equal to mathematical certainty: yet it requires thought and attention; and the mind must apply itself to a regular deduction of it from some part of our intuitive knowledge, or else we shall be as uncertain and ignorant of this as of other propositions, which are in themselves capable of clear demonstration. To show, therefore, that we are capable of knowing, i.e. being certain that there is a God, and how we may come by this certainty, I think we need go no further than ourselves, and that undoubted knowledge we have of our own existence.

2. For man knows that he himself exists. I think it is beyond question, that man has a clear idea of his own being; he knows certainly he exists, and that he is something. He that can doubt whether he be anything or no, I speak not to; no more than I would argue with pure nothing, or endeavour to convince nonentity that it were something. If any one pretends to be so sceptical as to deny his own existence, (for really to doubt of it is manifestly impossible,) let him for me enjoy his beloved happiness of being nothing, until hunger or some other pain convince him of the contrary. This, then, I think I may take for a truth, which every one's certain knowledge assures him of, beyond the liberty of doubting, viz. that he is something that actually exists.

3 He knows also that nothing cannot produce a being; therefore something must have existed from eternity. In the next place, man knows, by an intuitive certainty, that bare nothing can no more produce any real being, than it can be equal to two right angles. If a man knows not that nonentity, or the absence of all being, cannot be equal to two right angles, it is impossible he should know any demonstration in Euclid. If, therefore, we know there is some real being, and that nonentity cannot produce any real being, it is an evident demonstration, that from eternity there has been something; since what was not from eternity had a beginning; and what had a beginning must be produced by something else.

4. And that eternal Being must be most powerful. Next, it is evident, that what had its being and beginning from another, must also have all that which is in and belongs to its being from another too. All the powers it has must be owing to and received from the same source. This eternal source, then, of all being must also be the source and original of all power; and so this eternal Being must be also the most powerful.

5. And most knowing. Again, a man finds in himself perception and knowledge. We have then got one step further; and we are certain now that there is not only some being, but some knowing, intelligent being in the world. There was a time, then, when there was no knowing being, and when knowledge began to be; or else there has been also a knowing being from eternity. If it be said, there was a time when no being had any knowledge, when that eternal being was void of all understanding; I reply, that then it was impossible there should ever have been any knowledge: it being as impossible that things wholly void of knowledge, and operating blindly, and without any perception, should produce a knowing being, as it is impossible that a triangle should make itself three angles bigger than two right ones. For it is as repugnant to the idea of senseless matter, that it should put into itself sense, perception, and knowledge, as it is repugnant to the idea of a triangle, that it should put into itself greater angles than two right ones.

6. And therefore God. Thus, from the consideration of ourselves, and what we infallibly find in our own constitutions, our reason leads us to the knowledge of this certain and evident truth,- That there is an eternal, most powerful, and most knowing Being; which whether any one will please to call God, it matters not. The thing is evident; and from this idea duly considered, will easily be deduced all those other attributes, which we ought to ascribe to this eternal Being. If, nevertheless, any one should be found so senselessly arrogant, as to suppose man alone knowing and wise, but yet the product of mere ignorance and chance; and that all the rest of the universe acted only by that blind haphazard; I shall leave with him that very rational and emphatical rebuke of Tully (I. ii. De Leg.), to be considered at his leisure: "What can be more sillily arrogant and misbecoming, than for a man to think that he has a mind and understanding in him, but yet in all the universe beside there is no such thing? Or that those things, which with the utmost stretch of his reason he can scarce comprehend, should be moved and managed without any reason at all?" Quid est enim verius, quam neminem esse oportere tam stulte arrogantem, ut in se mentem et rationem putet inesse, in caelo mundoque non putet? Aut ea quae vix summa ingenii ratione comprehendat, nulla ratione moveri putet?

From what has been said, it is plain to me we have a more certain knowledge of the existence of a God, than of anything our senses have not immediately discovered to us. Nay, I presume I may say, that we more certainly know that there is a God, than that there is anything else without us. When I say we know, I mean there is such a knowledge within our reach which we cannot miss, if we will but apply our minds to that, as we do to several other inquiries.

7. Our idea of a most perfect Being, not the sole proof of a God. How far the idea of a most perfect being, which a man may frame in his mind, does or does not prove the existence of a God, I will not here examine. For in the different make of men's tempers and application of their thoughts, some arguments prevail more on one, and some on another, for the confirmation of the same truth. But yet, I think, this I may say, that it is an ill way of establishing this truth, and silencing atheists, to lay the whole stress of so important a point as this upon that sole foundation: and take some men's having that idea of God in their minds, (for it is evident some men have none, and some worse than none, and the most very different,) for the only proof of a Deity; and out of an over fondness of that darling invention, cashier, or at least endeavour to invalidate all other arguments; and forbid us to hearken to those proofs, as being weak or fallacious, which our own existence, and the sensible parts of the universe offer so clearly and cogently to our thoughts, that I deem it impossible for a considering man to withstand them. For I judge it as certain and clear a truth as can anywhere be delivered, that "the invisible things of God are clearly seen from the creation of the world, being understood by the things that are made, even his eternal power and Godhead." Though our own being furnishes us, as I have shown, with an evident and incontestable proof of a Deity; and I believe nobody can avoid the cogency of it, who will but as carefully attend to it, as to any other demonstration of so many parts: yet this being so fundamental a truth, and of that consequence, that all religion and genuine morality depend thereon, I doubt not but I shall be forgiven by my reader if I go over some parts of this argument again, and enlarge a little more upon them.

8. Recapitulation- something from eternity. There is no truth more evident than that something must be from eternity. I never yet heard of any one so unreasonable, or that could suppose so manifest a contradiction, as a time wherein there was perfectly nothing. This being of all absurdities the greatest, to imagine that pure nothing, the perfect negation and absence of all beings, should ever produce any real existence.

It being, then, unavoidable for all rational creatures to conclude, that something has existed from eternity; let us next see what kind of thing that must be.

9. Two sorts of beings, cogitative and incogitative. There are but two sorts of beings in the world that man knows or conceives.

First, such as are purely material, without sense, perception, or thought, as the clippings of our beards, and parings of our nails.

Secondly, sensible, thinking, perceiving beings, such as we find ourselves to be. Which, if you please, we will hereafter call cogitative and incogitative beings; which to our present purpose, if for nothing else, are perhaps better terms than material and immaterial.

10. Incogitative being cannot produce a cogitative being. If, then, there must be something eternal, let us see what sort of being it must be. And to that it is very obvious to reason, that it must necessarily be a cogitative being. For it is as impossible to conceive that ever bare incogitative matter should produce a thinking intelligent being, as that nothing should of itself produce matter. Let us suppose any parcel of matter eternal, great or small, we shall find it, in itself, able to produce nothing. For example: let us suppose the matter of the next pebble we meet with eternal, closely united, and the parts firmly at rest together; if there were no other being in the world, must it not eternally remain so, a dead inactive lump? Is it possible to conceive it can add motion to itself, being purely matter, or produce anything? Matter, then, by its own strength, cannot produce in itself so much as motion: the motion it has must also be from eternity, or else be produced, and added to matter by some other being more powerful than matter; matter, as is evident, having not power to produce motion in itself. But let us suppose motion eternal too: yet matter, incogitative matter and motion, whatever changes it might produce of figure and bulk, could never produce thought: knowledge will still be as far beyond the power of motion and matter to produce, as matter is beyond the power of nothing or nonentity to produce. And I appeal to every one's own thoughts, whether he cannot as easily conceive matter produced by nothing, as thought to be produced by pure matter, when, before, there was no such thing as thought or an intelligent being existing? Divide matter into as many parts as you will, (which we are apt to imagine a sort of spiritualizing, or making a thinking thing of it,) vary the figure and motion of it as much as you please- a globe, cube, cone, prism, cylinder, &c., whose diameters are but 100,000th part of a gry, will operate no otherwise upon other bodies of proportionable bulk, than those of an inch or foot diameter; and you may as rationally expect to produce sense, thought, and knowledge, by putting together, in a certain figure and motion, gross particles of matter, as by those that are the very minutest that do anywhere exist. They knock, impel, and resist one another, just as the greater do; and that is all they can do. So that, if we will suppose nothing first or eternal, matter can never begin to be: if we suppose bare matter without motion, eternal, motion can never begin to be: if we suppose only matter and motion first, or eternal, thought can never begin to be. For it is impossible to conceive that matter, either with or without motion, could have, originally, in and from itself, sense, perception, and knowledge; as is evident from hence, that then sense, perception, and knowledge, must be a property eternally inseparable from matter and every particle of it. Not to add, that, though our general or specific conception of matter makes us speak of it as one thing, yet really all matter is not one individual thing, neither is there any such thing existing as one material being, or one single body that we know or can conceive. And therefore, if matter were the eternal first cogitative being, there would not be one eternal, infinite, cogitative being, but an infinite number of eternal, finite, cogitative beings, independent one of another, of limited force, and distinct thoughts, which could never produce that order, harmony, and beauty which are to be found in nature. Since, therefore, whatsoever is the first eternal being must necessarily be cogitative; and whatsoever is first of all things must necessarily contain in it, and actually have, at least, all the perfections that can ever after exist; nor can it ever give to another any perfection that it hath not either actually in itself, or, at least, in a higher degree; it necessarily follows, that the first eternal being cannot be matter.

11. Therefore, there has been an eternal cogitative Being. If, therefore, it be evident, that something necessarily must exist from eternity, it is also as evident, that that something must necessarily be a cogitative being: for it is as impossible that incogitative matter should produce a cogitative being, as that nothing, or the negation of all being, should produce a positive being or matter.

12. The attributes of the eternal cogitative Being. Though this discovery of the necessary existence of an eternal Mind does sufficiently lead us into the knowledge of God; since it will hence follow, that all other knowing beings that have a beginning must depend on him, and have no other ways of knowledge or extent of power than what he gives them; and therefore, if he made those, he made also the less excellent pieces of this universe,- all inanimate beings, whereby his omniscience, power, and providence will be established, and all his other attributes necessarily follow: yet, to clear up this a little further, we will see what doubts can be raised against it.

13. Whether the eternal Mind may he also material or no. First, Perhaps it will be said, that, though it be as clear as demonstration can make it, that there must be an eternal Being, and that Being must also be knowing: yet it does not follow but that thinking Being may also be material. Let it be so, it equally still follows that there is a God. For if there be an eternal, omniscient, omnipotent Being, it is certain that there is a God, whether you imagine that Being to be material or no. But herein, I suppose, lies the danger and deceit of that supposition:- there being no way to avoid the demonstration, that there is an eternal knowing Being, men, devoted to matter, would willingly have it granted, that this knowing Being is material; and then, letting slide out of their minds, or the discourse, the demonstration whereby an eternal knowing Being was proved necessarily to exist, would argue all to be matter, and so deny a God, that is, an eternal cogitative Being: whereby they are so far from establishing, that they destroy their own hypothesis. For, if there can be, in their opinion, eternal matter, without any eternal cogitative Being, they manifestly separate matter and thinking, and suppose no necessary connexion of the one with the other, and so establish the necessity of an eternal Spirit, but not of matter; since it has been proved already, that an eternal cogitative Being is unavoidably to be granted. Now, if thinking and matter may be separated, the eternal existence of matter will not follow from the eternal existence of a cogitative Being, and they suppose it to no purpose.

14. Not material: first, because each particle of matter is not cogitative. But now let us see how they can satisfy themselves, or others, that this eternal thinking Being is material.

I. I would ask them, whether they imagine that all matter, every particle of matter, thinks? This, I suppose, they will scarce say; since then there would be as many eternal thinking beings as there are particles of matter, and so an infinity of gods. And yet, if they will not allow matter as matter, that is, every particle of matter, to be as well cogitative as extended, they will have as hard a task to make out to their own reasons a cogitative being out of incogitative particles, as an extended being out of unextended parts, if I may so speak.

15. II. Secondly, because one particle alone of matter cannot be cogitative. If all matter does not think, I next ask, Whether it be only one atom that does so? This has as many absurdities as the other; for then this atom of matter must be alone eternal or not. If this alone be eternal, then this alone, by its powerful thought or will, made all the rest of matter. And so we have the creation of matter by a powerful thought, which is that the materialists stick at; for if they suppose one single thinking atom to have produced all the rest of matter, they cannot ascribe that pre-eminency to it upon any other account than that of its thinking, the only supposed difference. But allow it to be by some other way which is above our conception, it must still be creation; and these men must give up their great maxim, Ex nihilo nil fit. If it be said, that all the rest of matter is equally eternal as that thinking atom, it will be to say anything at pleasure, though ever so absurd. For to suppose all matter eternal, and yet one small particle in knowledge and power infinitely above all the rest, is without any the least appearance of reason to frame an hypothesis. Every particle of matter, as matter, is capable of all the same figures and motions of any other; and I challenge any one, in his thoughts, to add anything else to one above another.

16. III. Thirdly, because a system of incogitative matter cannot be cogitative. If then neither one peculiar atom alone can be this eternal thinking being; nor all matter, as matter, i.e. every particle of matter, can be it; it only remains, that it is some certain system of matter, duly put together, that is this thinking eternal Being. This is that which, I imagine, is that notion which men are aptest to have of God; who would have him a material being, as most readily suggested to them by the ordinary conceit they have of themselves and other men, which they take to be material thinking beings. But this imagination, however more natural, is no less absurd than the other: for to suppose the eternal thinking Being to be nothing else but a composition of particles of matter, each whereof is incogitative, is to ascribe all the wisdom and knowledge of that eternal Being only to the juxta-position of parts; than which nothing can be more absurd. For unthinking particles of matter, however put together, can have nothing thereby added to them, but a new relation of position, which it is impossible should give thought and knowledge to them.

17. And that whether this corporeal system is in motion or at rest. But further: this corporeal system either has all its parts at rest, or it is a certain motion of the parts wherein its thinking consists. If it be perfectly at rest, it is but one lump, and so can have no privileges above one atom.

If it be the motion of its parts on which its thinking depends, all the thoughts there must be unavoidably accidental and limited; since all the particles that by motion cause thought, being each of them in itself without any thought, cannot regulate its own motions, much less be regulated by the thought of the whole; since that thought is not the cause of motion, (for then it must be antecedent to it, and so without it,) but the consequence of it; whereby freedom, power, choice, and all rational and wise thinking or acting, will be quite taken away: so that such a thinking being will be no better nor wiser than pure blind matter; since to resolve all into the accidental unguided motions of blind matter, or into thought depending on unguided motions of blind matter, is the same thing: not to mention the narrowness of such thoughts and knowledge that must depend on the motion of such parts. But there needs no enumeration of any more absurdities and impossibilities in this hypothesis (however full of them it be) than that before mentioned; since, let this thinking system be all or a part of the matter of the universe, it is impossible that any one particle should either know its own, or the motion of any other particle, or the whole know the motion of every particle; and so regulate its own thoughts or motions, or indeed have any thought resulting from such motion.

18. Matter not co-eternal with an eternal Mind. Secondly, Others would have Matter to be eternal, notwithstanding that they allow an eternal, cogitative, immaterial Being. This, though it take not away the being of a God, yet, since it denies one and the first great piece of his workmanship, the creation, let us consider it a little. Matter must be allowed eternal: Why? because you cannot conceive how it can be made out of nothing: why do you not also think yourself eternal? You will answer, perhaps, Because, about twenty or forty years since, you began to be. But if I ask you, what that you is, which began then to be, you can scarce tell me. The matter whereof you are made began not then to be: for if it did, then it is not eternal: but it began to be put together in such a fashion and frame as makes up your body; but yet that frame of particles is not you, it makes not that thinking thing you are; (for I have now to do with one who allows an eternal, immaterial, thinking Being, but would have unthinking Matter eternal too;) therefore, when did that thinking thing begin to be? If it did never begin to be, then have you always been a thinking thing from eternity; the absurdity whereof I need not confute, till I meet with one who is so void of understanding as to own it. If, therefore, you can allow a thinking thing to be made out of nothing, (as all things that are not eternal must be,) why also can you not allow it possible for a material being to be made out of nothing by an equal power, but that you have the experience of the one in view, and not of the other? Though, when well considered, creation of a spirit will be found to require no less power than the creation of matter. Nay, possibly, if we would emancipate ourselves from vulgar notions, and raise our thoughts, as far as they would reach, to a closer contemplation of things, we might be able to aim at some dim and seeming conception how matter might at first be made, and begin to exist, by the power of that eternal first Being: but to give beginning and being to a spirit would be found a more inconceivable effect of omnipotent power. But this being what would perhaps lead us too far from the notions on which the philosophy now in the world is built, it would not be pardonable to deviate so far from them; or to inquire, so far as grammar itself would authorize, if the common settled opinion opposes it: especially in this place, where the received doctrine serves well enough to our present purpose, and leaves this past doubt, that the creation or beginning of any one SUBSTANCE out of nothing being once admitted, the creation of all other but the CREATOR himself, may, with the same ease, be supposed.

19. Objection: "Creation out of nothing." But you will say, Is it not impossible to admit of the making anything out of nothing, since we cannot possibly conceive it? I answer, No. Because it is not reasonable to deny the power of an infinite being, because we cannot comprehend its operations. We do not deny other effects upon this ground, because we cannot possibly conceive the manner of their production. We cannot conceive how anything but impulse of body can move body; and yet that is not a reason sufficient to make us deny it possible, against the constant experience we have of it in ourselves, in all our voluntary motions; which are produced in us only by the free action or thought of our own minds, and are not, nor can be, the effects of the impulse or determination of the motion of blind matter in or upon our own bodies; for then it could not be in our power or choice to alter it. For example: my right hand writes, whilst my left hand is still: What causes rest in one, and motion in the other? Nothing but my will,- a thought of my mind; my thought only changing, the right hand rests, and the left hand moves. This is matter of fact, which cannot be denied: explain this and make it intelligible, and then the next step will be to understand creation. For the giving a new determination to the motion of the animal spirits (which some make use of to explain voluntary motion) clears not the difficulty one jot. To alter the determination of motion, being in this case no easier nor less, than to give motion itself: since the new determination given to the animal spirits must be either immediately by thought, or by some other body put in their way by thought which was not in their way before, and so must owe its motion to thought: either of which leaves voluntary motion as unintelligible as it was before. In the meantime, it is an overvaluing ourselves to reduce all to the narrow measure of our capacities, and to conclude all things impossible to be done, whose manner of doing exceeds our comprehension. This is to make our comprehension infinite, or God finite, when what He can do is limited to what we can conceive of it. If you do not understand the operations of your own finite mind, that thinking thing within you, do not deem it strange that you cannot comprehend the operations of that eternal infinite Mind, who made and governs all things, and whom the heaven of heavens cannot contain.



To: J_F_Shepard who wrote (213431)12/30/2001 5:38:33 PM
From: gao seng  Read Replies (1) | Respond to of 769670
 
beta.physicsweb.org
The Anthropic Principle makes a comeback! I like the "refined" version...
Message 16808735
Life, the cosmos and everything
Physics in Action: October 2001

Cosmologists who study the link between life in the universe and the values of the physical constants were once viewed with suspicion by other scientists. But a recent high-profile conference at Cambridge showed that the subject is fast becoming academically respectable.

Stars in the making

The notion that certain features of the universe, such as the values of the physical constants, may be constrained by the requirement that intelligent observers can arise was first mooted nearly 40 years ago. This "anthropic principle" has been a focus of controversy (even intense antipathy in some quarters) ever since. However, judging by a conference that took place in Cambridge at the end of August, the notion seems to be attracting the interest of an increasing number of eminent physicists. The meeting ­ the first in a series supported in part by the Templeton Foundation ­ took place at the Cambridge home of Martin Rees, one of the foremost advocates of the anthropic principle. Future meetings will address the biological and philosophical aspects of the subject.

What is the anthropic principle?

There are various versions of the anthropic principle. The "weak" version accepts the laws of nature and the values of the physical constants as given and claims that the existence of life then imposes a selection effect on where and when we observe the universe. For example, the current age of the universe cannot be less than the nuclear-burning time of a massive star ­ otherwise there would not have been enough time for the chemical elements that are essential for life to have been generated by stellar nucleosynthesis. On the other hand, the universe cannot be much older than this because the stars would have all burned out. This means that life can only exist when the universe has roughly its observed age. This is a logical consequence of our existence and is relatively uncontroversial.

The "strong" version of the anthropic principle suggests that the presence of observers imposes constraints on the physical constants themselves. In other words, life could only arise if the constants were close to their observed values. Some people might infer from this the existence of a creator who tailor-made the universe for our benefit. However, cosmologists have recently realized that processes in the early universe may naturally have generated an ensemble of universes, each having different values of the constants. We live in one of the universes that is conducive to life. Even though invoking multiple universes is highly speculative, this makes the strong anthropic principle much more palatable from a physical point of view since it just becomes an aspect of the weak version.

In order to argue that the universe is fine-tuned for the emergence of observers, one must specify who qualifies for this description, and not everybody agrees on this. Brandon Carter, who first coined the term "anthropic principle" in 1974, introduced the meeting by emphasizing that the concept can be refined in various ways according to whether one includes every conceivable observer (including ants and extraterrestrials) or just Homo sapiens. He proposed a "refined" anthropic principle, in which the observer is "weighted" according to the amount of information processed. It is not clear, however, that consciousness is the key feature of the anthropic constraints. Other speakers stressed that many of the fine-tunings are just associated with the development of complexity.

Evidence for the anthropic principle

As Virginia Trimble emphasized, the prerequisites for getting out of bed in the morning are many and varied! In particular, the existence of life (or at least our particular form of it) requires the formation of a hierarchy of structures ­ planets, stars and galaxies ­ and, as successive speakers pointed out, each of these seems to require rather special conditions.

Carl Murray focused on planet formation. The discovery of several dozen extra-solar planetary systems in recent years suggests that our solar system is far from unique, although he did emphasize that merely having planets is not enough for life to occur since the Earth seems to have been fortunate in various other ways. For example, it is known that the Moon has played an important role as a climate regulator. If the Moon were much smaller, the spin axis of the Earth would change chaotically ­ leading to catastrophic weather variations that could exclude the emergence of life. Another fortunate aspect of our solar system is that the outer planets seem to have played an important role in the formation of the inner ones.

Our presence on Earth might be regarded as an example of the weak anthropic principle. Rather more controversial are the anthropic conditions that seem to be associated with stars. I discussed in my talk how these involve constraints between the dimensionless "coupling constants" that describe the strengths of the fundamental interactions ­ in particular the electric fine-structure constant a = e2/h-bar c ~ 1/137, the gravitational fine-structure constant aG = Gmp2/h-bar c = 5 x 10­39, and also the weak fine-structure constant aW = gmec2/h-bar3 x 10­10, where G is the gravitational constant, g is the Fermi constant, mp is the mass of a proton, h-bar is the Planck constant divided by 2 pi, c is the speed of light and me is the mass of an electron.

It seems that aG must be roughly a20 for both "convective" and "radiative" stars to exist (prerequisites for planets and supernovae, respectively) and roughly aW4 for neutrinos to eject the envelope of a star in a supernova explosion (necessary for the dissemination of heavy elements). These "coincidences" might be regarded as examples of the strong anthropic principle.

Several contributors highlighted an even more striking example associated with stars. This involves the strong interaction and concerns the generation of carbon (another prerequisite for our form of life) in the helium-burning phase of red giant stars. This occurs via a reaction in which two alpha particles unite to form a beryllium nucleus that then combines with another alpha particle to form carbon. However, as the late Fred Hoyle (see Sir Fred Hoyle 1915 - 2001 and page 11 of this issue, print version) first pointed out, the beryllium would decay before interacting with another alpha particle were it not for the existence of a remarkably finely tuned resonance in this interaction. This fact is sometimes presented as an anthropic prediction but, as Trimble intriguingly pointed out, there may have been evidence for this resonance in the data even before Hoyle suggested that it be sought in the laboratory.

Heinz Oberhummer, who has studied this resonance in more detail, reported some beautiful work showing how the amount of oxygen and carbon produced in red giant stars varies with the strength and range of the nucleon interactions. His work indicates that the nuclear interaction must be tuned to at least 0.5% if one is to produce both these elements to the extent required for life.

Cosmological anthropic constraints

The anthropic constraints associated with the formation of galaxies involve various cosmological parameters, such as the density of the matter in the universe, the amplitude of the initial density fluctuations, the photon-to-baryon ratio and the cosmological constant (an extra term Einstein introduced into his field equations for cosmological reasons and which may cause the universe to accelerate). Some of these parameters might be determined by processes in the early universe rather than being prescribed freely as part of the initial conditions. However, as Martin Rees discussed, even small deviations from the observed values of such parameters would exclude the formation of structures like galaxies and their subsequent fragmentation into stars.

Host with the most

An interesting twist on these arguments was provided by Anthony Aguirre, who described anthropic constraints on so-called cold cosmological models, in which the initial ratio of photons to baryons (i.e. ordinary matter like protons and neutrons) is much smaller than currently observed. He pointed out that such models could provide life-supporting conditions with very different values of the cosmological parameters and coupling constants to those found in our universe. Both Rees and Aguirre stressed the importance of calculating the probability distribution for such parameters across the different universes because this is the only way of testing the multiple universe or "multiverse" proposal. For example, if the distribution for the amplitude of the density fluctuations fell off too slowly, we would be surprised to be in a universe with a value as small as is observed.

Fundamental constants

In assessing the anthropic principle, a key issue is whether some fundamental theory will eventually determine all the constants uniquely or whether some of them are contingent on initial conditions or accidental features of symmetry breaking. In the first case there is no room for the anthropic principle and the anthropic fine-tunings must just be regarded as coincidental. In the second case, there may be room for anthropic arguments.

One first has to decide which physical constants should be regarded as fundamental. Unification theories predict relationships between some of the constants, so one is certainly not free to vary all of them. Craig Hogan identified the coupling constants associated with the four interactions and some basic mass-scales (e.g. the masses of the electron and the up and down quarks) as fundamental. Although features of biology are not sensitive to the values of these constants, the existence of stable atoms and an interesting range of chemical elements certainly are. For example, even small changes in the quark and electron masses would make the proton, deuteron or hydrogen atom unstable.

The particle physicists at the meeting expressed various views on how likely such tunings are to result from some fundamental theory. As John Donoghue emphasized, "fine-tuning" arises in various different contexts in particle physics ­ why, for example, are the cosmological constant and strong charge­parity (CP) violation so small? ­ even though most of these may have no anthropic significance. However, some of them do and he particularly stressed anthropic constraints on the "vacuum expectation value" of the Higgs field, which determines the masses of all the ordinary particles.

At least some physical parameters would appear to be contingent. For example, Frank Wilczek, who first posited the existence of a light particle called the "axion" in order to explain the lack of CP violation in strong interactions, pointed out that the density of these particles would now be much larger than the baryonic density unless an angle associated with the initial conditions of the axion field were tiny. Such a large axion density would be incompatible with the formation of galaxies ­ and so is anthropically disallowed. The only reasonable explanation for axions and baryons having comparable densities is to invoke an early "inflationary" phase for the universe, in which it expands exponentially fast due to the effect of a cosmological constant. The axion angle would then have different values in different places and we would necessarily live in a region where this angle was very small.

Most physicists would probably prefer the constants to be determined by more conventional physics. So how likely could that be? The current favourite candidate for a fundamental theory is the string model. This posits that space­time is either 10-dimensional (superstring theory) or 11-dimensional (M-theory), with four-dimensional physics emerging from the compactification of the extra dimensions. Unlike the Standard Model of particle physics, which does not incorporate gravity and contains several dozen free parameters, M-theory may predict all the fundamental constants uniquely. This point was emphasized by Malcolm Perry. The only input would then be the string scale (related to the size of the 11th dimension). However, the situation is probably not as clear-cut as this since M-theory only predicts that the number of vacuum states should be discrete; the constants may be uniquely determined within each one but could be different across the states themselves. The crucial issue is whether the number of vacuum states is sufficiently large and their spacing sufficiently small to allow some room for anthropic constraints. This issue remains unresolved.

A new twist arises if the (so-called) constants vary in time even in our universe. This is expected in many unification theories since the constants should be related to the size of the compact internal dimensions, which would be expected to change during at least part of the universe's history. This theme was taken further by John Barrow. He is part of a team that recently claimed to have found positive evidence for a variation in a of about seven parts in a million by studying absorption lines in several hundred galaxies (see When constants are not constant by Chris Carilli). His attempts to model this effect suggest that a should remain constant during both the early "radiation-dominated" phase of the universe and the late "curvature-dominated" or "cosmological-constant-dominated" phases. However, a can vary over the intermediate matter-dominated phase, which would make it difficult to satisfy the anthropic constraints on a for an extended period if the curvature or cosmological constant were too close to zero.

Quantum cosmology

One reason why many cosmologists now take the anthropic principle seriously is that the "many worlds" interpretation of quantum mechanics seems to be the only sensible context in which to discuss "quantum cosmology" ­ the branch of physics that tries to describe what happened near the big bang. As emphasized by Jim Hartle, quantum theory allows many mutually incompatible histories. However, it only makes sense to consider the initial conditions that led to the classical behaviour that we observe today. (With complete ignorance of the initial conditions, the quantum fluctuations could be arbitrarily large and the emergence of a classical world would not be possible.) Within this restriction, quantum cosmology allows many different worlds or "branches", all with different values of the constants, and this validates the strong anthropic principle.

Nevertheless, the cosmologists present had widely different views on how the different worlds might arise. Andrei Linde and Alex Vilenkin invoked "eternal" inflation, in which the universe is eternally self-reproducing. This version of inflation predicts that there may be an infinite number of exponentially large domains ­ all with different laws of low-energy physics and different coupling constants. Indeed, Linde regarded inflation as the only plausible basis for anthropic arguments. Vilenkin argued that there is a well motivated prescription within the eternal-inflation scenario for calculating probability distributions for the various constants, showing that the distributions should be weighted by the volume of the universe in which each set of values pertains.

Brief history of time

On the other hand, Stephen Hawking objected to the eternal-inflation model on the grounds that it extends to the infinite past and thus violates his "no boundary" proposal for the origin of the universe. This proposal requires that the universe start at a finite time and it avoids the initial singularity by requiring time to become imaginary there (i.e. time is multiplied by (­1)1/2 so that the metric starts off Euclidean rather than Lorentzian). Hawking uses the path-integral approach to calculate the probability of a particular history but only sums over those histories that lead to observers.

Neil Turok elaborated on this theme, showing that there are so-called instantons that represent classical solutions of the Euclidean equations that possess a continuation to real Lorentzian space­time. Although the path integral favours inflationary periods shorter than required, anthropic selection can salvage this since one only considers histories containing observers. This permits either open or closed universes but he argued that Hawking's favoured (closed) solution is unstable.

More radical physics?

The final day of the conference focused on more radical deviations from standard physics as well as some philosophical issues. Richard Gott presented another version of the many-worlds principle, speculating how the existence of closed timelike curves in general relativity could allow the universe to create itself. Max Tegmark discussed anthropic constraints on the dimensionality of space and time: three spatial dimensions are required for the stability of planetary orbits and more than one time dimension would destroy causality. He also raised the issue of whether it is sufficient to consider universes with different values of the coupling constants, or whether one should also contemplate universes with different physical laws or even different mathematical foundations. This might be the only way to explain anthropic coincidences if the physical constants within a given set of laws turn out to be uniquely specified.

Bill Stoeger discussed the legitimacy of anthropic arguments. He argued that the weak anthropic principle is a logical necessity ­ but that the strong version only makes sense if variations in the initial conditions of the universe or the values of the constants or the laws of nature allow some scope for anthropic selection. The multiverse proposal may accommodate this possibility, but how legitimate is it, he argued, to invoke the existence of other universes for which there may never be any direct evidence?

Lee Smolin stressed that it is only justifiable if one has a theory that independently predicts the existence of these universes, and that such a theory, to be scientific, must be falsifiable. He argued that most of the universes should have properties like our own and that this need not be equivalent to requiring the existence of observers.

Smolin's own approach invoked a form of natural selection. He argued that the formation of black holes might generate new universes in which the constants are slightly mutated. In this way, after many generations, the parameter distribution will peak around those values for which black-hole formation is maximized. This proposal involves very speculative physics, since we have no understanding of how the baby universes are born. However, it has the virtue of being testable since one can calculate how many black holes would form if the parameters were different.

A few speakers touched on the issue of consciousness. This is a topic usually eschewed by physicists, but Don Page emphasized that physics is primarily concerned with observations and these are, at root, conscious perceptions. He argued that a particular observer's experience should be a random sample of all conscious experiences and discussed how one might derive the probability measure for this sample. Ultimately this must depend on unknown laws connecting consciousness with physics. Linde also proposed that consciousness might play a crucial role in the world, speculating that it might exist (like space­time) even without matter.

Such considerations may go beyond the domain of legitimate science. But perhaps the main message of the meeting was that developments in modern physics may require one to extend one's view of what constitutes legitimate science anyway. The anthropic principle may not yet have attained complete scientific respectability, but it can no longer be dismissed as nothing more than mere metaphysics.

"Anthropic arguments in fundamental physics and cosmology" was held in Cambridge from 30 August ­1 September.

Author
Bernard Carr is in the Astronomy Unit, School of Mathematical Sciences, Queen Mary, University of London, UK.



To: J_F_Shepard who wrote (213431)12/30/2001 5:48:54 PM
From: greenspirit  Read Replies (1) | Respond to of 769670
 
JF, for me, the point of view expressed in this article sums it up very well.

Article...Forms of Design and the Nature of God
doesgodexist.org

There are many kinds of scientific evidence for the existence of God. One of the most diverse kinds of evidence is the evidence that comes from design which is seen in numerous areas of scientific endeavor. It is the contention of this journal that chance is an invalid mechanism to explain the complexities seen in the creation, and throughout the thirty years that we have been involved in this work we have given literally hundreds of examples.

It is important to understand that when a person looks at evidence of design in the creation, there are three forms that the evidence falls into--or three kinds of arguments that are being made. In this article we would like to review these three forms of design.

Intuitive Design

Intuitive design is a form of design that simply asks if what we are examining can realistically be explained on a chance basis. For most of us observing the birth of a new baby will convince us that chance is a difficult explanation to accept. Looking at that perfect new human form which has been produced in less than 10 months is incredible. When we study the migratory processes of monarch butterflies, Arctic terns, or countless other creatures that travel incredible distances using a variety of navigational tools we see complexity that defies a chance explanation. The operation of the human body is a process that is so complex that mankind is still left with massive numbers of mysteries that are unsolved. The human brain is a computer-like device that we still have microscopic knowledge of, and human behavior and its connection to the brain and to our genetic makeup is an area of study that changes daily.

Evolutionists have attempted to formulate models to suggest how some of these things could in fact develop by chance. Their models are clever and can sound convincing, especially when couched in language that makes it sound as though the model was observed happening instead of being proposed as a possibility. When you realize that there are a large number of events that would have had to have taken place at the same time and in the same place, the probability of that actually happening becomes significantly lower. That realization has led to the anthropic arguments discussed later in the article.

Creative Design

Nature is full of beauty. Many times this incredible beauty has no survival value or strength value at all, and in fact may be a liability to the individual. An example of this is the Fibonacci spiral seen over and over in the creation. This spiral has a very specific shape and is controlled by a mathematical precision that has prompted literally hundreds of scientific and mathematical papers over the years. There is even a Fibonacci Quarterly and a society that explores and promotes the applications of the Fibonacci sequence and its applications. The Fibonacci spiral is seen in a bewildering number of applications in nature. Examples include the curving arms of galaxies, the curl of a water wave, the curve of water going down the drain, the curl of the teeth of everything from a groundhog to a grizzly bear, the curl of the beaks of most birds, the curl of a spider web, a finger print, the tubers of hundreds of plant species, the curl of the flowers of a sunflower or magnolia, the curl of the cochlea of the inner ear, the proboscis of many insects, and the curve of subatomic particles.

As you read through this very abbreviated list, there are several things that should jump out at you. First of all the Fibonacci spiral is not confined to one area of the physical world. It is seen in physics, chemistry, ornithology, entomology, anatomy, and so forth. Most of these things do not offer a survival value or strength. The shape of the curves of your finger print or the way water goes down the drain is not a matter of strength, and even if it were there is no special advantage strength-wise to the spiral. The fact that this common shape appears across diverse members of the plant and animal kingdom makes it difficult to propose an evolutionary advantage or to offer something that natural selection can operate on.

Every person reading this article has an area of creativity that you have expertise in. Some of you can look at a painting and know instantly who the artist was that created it. Some of you can listen to two bars of a musical piece and know instantly who the performer is or perhaps who composed the piece. Some of you can look at a piece of architecture and recognize who the architect was, who created it, or you may recognize a particular make or style of furniture, or house construction. We all know in some area or another what the intelligence was that designed and produced the thing we like.

Creative design in the natural world is almost identical. A creative mind created the beautiful, graceful sweeping lines of the Fibonacci spiral. The beautiful color that occurs in animals who are color blind themselves speaks of an aesthetic appreciation of the color that is shown. The incredible artistic forms seen everywhere in the creation that offer no special strength or camouflage speak of a creative architectural force. One can not say "Nature prefers beauty," one can only, "God prefers beauty."

Mathematical Design --
The Anthropic Principle

When we discussed intuitive design we pointed out that in the natural world there are large numbers of variables which all have to be "right" for a given event or entity to exist. In order for a planet to exist which can support any kind of life, a wide range of physical conditions have to exist. These conditions come from a wide range of unrelated causes--to have the right temperatures, one must be in the right kind of star system, the right distance from that star, be rotating at a certain rate, have the right gaseous combination, and be free of large energy heat sources or sinks. To have the right chemical basis for life one must be in the right type of galaxy, be in the right place in the galaxy, be in the right type of star group, have the right type and size of planet, and be free of a variety of damaging environmental variables. To have the right type of atmosphere a similar set of conditions exist. In fact every parameter essential to life has a large number of controlling agents to cause it, sustain it, and protect it. In the past fifty years science has vastly expanded its understandings of how many variables there are, and how vital each of those variables is. Even the physical variables that allow atoms and molecules to exist have been discovered to be far more in number and in effect than was previously thought.

The huge number of variables that have been discovered to exist pose a major problem for those who wish to believe that chance is the cause of all we see. The problem lies in the nature of probability. When you flip a coin, the odds of getting a "heads" is one in two or 50/50. If you flip a coin twice and want to get a "heads" each time, the probability is 1/2 x 1/2, or 1/4. That means if you flipped the coins twice, four times in a row, you would get back-to-back heads only once. If you wanted to get "heads" three times in a row, it would be 1/2 x 1/2 x 1/2 or one chance out of eight tries. The total probability is calculated by multiplying the individual probabilities that make up the total. To get a "heads" ten times in a row, the odds would be one in 1,024.

When we start considering highly complex things like life, atomic structure, chemical processes, or galactic events, the individual odds are not nice and simple like one out of two. Not only are the numbers not as simple, but there are far more variables involved. When scientists do these kinds of calculations they end up with probabilities that are so astronomical that chance becomes a clearly untenable explanation. Numbers like 1 in 10160 are common (that would be one chance out of 1 with 160 zeros after it). This kind of a number exceeds the number of possible stars in the cosmos, or even the number of possible baryons (building blocks of an atom). One cannot argue that given a certain amount of time, the event has to occur; but the event is unlikely to occur in any amount of possible time. On top of that, the event is only one step in a long line of steps to get to a desired final objective.

Chance is an invalid mechanism to explain the complexities seen in all parts of the cosmos. If there is an intelligence who used purpose and design to accomplish the creation then the odds no longer are relevant. A tornado will not go through an aircraft assembly factory and produce a 747, but human intelligence and creativity will.

Not only do the three forms of design in the cosmos demonstrate to us that we are the product of design, purpose, and intelligence, but the same design defines the properties of God. Power, intelligence, creativity, consistency, adaptability, and an incredible love and concern for man are all displayed. The lessons we can learn by studying God's design and planning are many and can draw us to our creator and His design for our own lives .