By Magis Contributor Robert Kurland, PhD
(This topic is presented as #4, rather than that on multiverses, since the presence of multiverses is often invoked as a partial explanation of the anthropic coincidences.)
The presence of organic life in the universe (namely us) requires a series of unlikely happenings and values for physical laws and their constants. This “fine-tuning” (as it's been called) has been likened to a room full of 10,000 dials, each of which has to be set to a precise setting in order to achieve action; 10,000 monkeys are let into the room and each adjusts a dial and, lo, action occurs. The set of coincidences was termed “The Anthropic Principle” by Brandon Carter in 1973, when he introduced it in a conference to oppose the “Copernican Principle”, that man has no special place in the universe.
The Anthropic Principle has been discussed extensively in books and articles. Fr. Spitzer has an excellent summary in “New Proofs for the Existence of God”. There is a concise summary by Robert Koons on his philosophy lectures website:http://www.leaderu.com/offices/koons/docs/lec11.html, giving various interpretations, with arguments for and against each. A good collection of articles with different (and opposing views) of the Anthropic Principle is given in God and Design (ed. Neil Manson). There are many versions of the Anthropic Principle ranging from the Weak Anthropic Principle, WAP, which tautologically observes that if the universe weren't fit for us to be here we would wouldn't be discussing the principle, through the Strong Anthropic Principle, SAP, that the universe has been fine-tuned for intelligent life (us), on up to the Completely Ridiculous Anthropic Principle (by Martin Gardner—you complete the acronym).
In assessing the improbable nature of the anthropic coincidences, some authors assign a specific probability to the value of some particular physical constant. Such assignment is not always justified, because probability considerations are ill defined, in the usual sense of evidential probability. For example, theoretical calculations have shown that if the strong nuclear force were 2 % higher or 2 % lower, then the elements as we know them would not have been formed. This does not mean that the probability of having the strong nuclear force at an anthropic value is 4%. In order to give a probability for this range, the population distribution of the parameters for the strong nuclear force would have to be known. Moreover, there is a difficulty in using probability in an after-the-fact, rather than a predictive sense. The way to use probabilities in assessing the anthropic coincidences is via Bayesian probability techniques, with well-defined prior assumptions, and to use the resulting Bayesian probability as a measure of belief.
Ellis, in his presentation of the anthropic coincidences, focuses on the special nature of physical laws that allow for the presence of life, rather than on their improbability:
“One of the most profound issues in cosmology is the Anthropic question...why does the Universe has the very special nature required in order that life can exist? The point is that a great deal of “fine tuning” is required in order that life be possible. There are many relationships embedded in physical laws that are not explained by physics, but are required for life to be possible; in particular various fundamental constants are highly constrained in their values if life as we know it is to exist...What requires explanation is why the laws of physics are such as to allow this complex functionality (life) to work. ...We can conceive of universes where the laws of physics (and so of chemistry) were different than in ours. Almost any change in these laws will prevent life as we know it from functioning.”
Ellis posits as a first requirement for the laws of physics “the kind of regularities that can underlie the existence of life”; laws that are not based on symmetry and variational principles are unlikely to produce the kind of complexity that would be required for life. He also sets up general conditions that allow for organic life and cosmological boundary/initial conditions. In this respect he cites the following as necessary:
- “Quantization that stabilizes matter and allows chemistry to exist through the Pauli exclusion principle;
- The number D of large spatial dimensions must be just 3 for complexity to exist.
- The seeds in the early universe for fluctuations (quantum fluctuations) that will later grow into galaxies must be of the right size that structures form without collapsing into black holes...
- The size of the universe and its age must be large enough...we need a sufficiently old universe for second generation stars to come into existence and then for planets to have a stable life for long enough that evolution could lead to the emergence of intelligent life. Thus the universe must be at about 15 billion years old for life to exist.
- There must be non-interference with local systems. The concept of locality is fundamental, allowing local systems to function effectively independently of the detailed structure of the rest of the Universe. We need the universe and the galaxies in it to be largely empty, and gravitational waves and tidal forces to be weak enough, so that local systems can function in a largely isolated way.
- The existence of the arrow of time, and of laws like the second law of thermodynamics, are probably necessary for evolution and for consciousness. This depends on boundary conditions at the beginning and end of the Universe.
- Presumably the emergence of a classical era out of a quantum state is required. The very early universe would be a domain where quantum physics would dominate leading to complete uncertainty and an inability to predict the consequence of any initial situation; we need this to evolve to a state where classical physics leads to the [roperties of regularity and predictability that allow order to emerge.
- The fact that the night sky is dark...is a consequence of the expansion of the universe together with the photon (light particle) to baryon (mass particle) ratio. This feature is a necessary condition for the existence of life: the biosphere on Earth functions by disposing of waste energy to the heat sink of the dark night sky. Thus one way of explaining why the sky is observed to be dark at night is that if this were not so, we would not be here to observe it.
- Physical conditions on planets must be a in a quasi-equilibrium state for long enough to allow the delicate balances that enable our existence, through the very slow process of evolution, to be fulfilled.”
There are a number of other constraints, limited values for forces—gravity, electromagnetic, weak nuclear, strong nuclear—and fundamental constants, including that for particle masses and number of particles that are needed for life to evolve. In summary, Ellis puts the Anthropic Principle as the following:
“Life is possible because both the laws of physics and the boundary conditions for the universe have a very special nature. only particular laws of physics, and particular initial conditions in the Universe, allow the existence of intelligent life of the kind we know. No evolutionary process whatever is possible for any kind of life if these laws and conditions do not have this restricted form.”
The philosophic/metaphysical context for these Anthropic conditions that Ellis sets forth will be given in the final post for this summary. It should be noted that one interpretation of the anthropic coincidences is the theory that infinitely many universes with potentially different physical laws and constants exist and so it is not unlikely that in all these one universe with appropriate conditions for life would be present. The analogy is like that of having a lottery ticket with the numbers 1 1 1 1 1 be the winner. That combination of numbers looks improbable, but since there are a whole host of numbers from 00000 to 99999, it is no less probable than any other number.