Fine-tuned universe

Source: Wikipedia, the free encyclopedia.

Part of a series on
Physical cosmology
Early universe
Backgrounds
Expansion · Future
Components · Structure
Components
Structure
Experiments
Scientists
Subject history
Part of a series on
Intelligent design
Clockwork
Watchmaker analogy
Concepts
Movement
Campaigns
Authors
Organisations
Reactions
Creationism

The characterization of the

dimensionless physical constants.[5]

History

In 1913, the chemist Lawrence Joseph Henderson wrote The Fitness of the Environment, one of the first books to explore fine tuning in the universe. Henderson discusses the importance of water and the environment to living things, pointing out that life as it exists on Earth depends entirely on Earth's very specific environmental conditions, especially the prevalence and properties of water.[6]

In 1961, physicist Robert H. Dicke claimed that certain forces in physics, such as gravity and electromagnetism, must be perfectly fine-tuned for life to exist in the universe.[7][8] Fred Hoyle also argued for a fine-tuned universe in his 1983 book The Intelligent Universe.[9] Hoyle wrote: "The list of anthropic properties, apparent accidents of a non-biological nature without which carbon-based and hence human life could not exist, is large and impressive."[10]

Belief in the fine-tuned universe led to the expectation that the Large Hadron Collider would produce evidence of physics beyond the Standard Model, such as supersymmetry,[11] but by 2012 it had not produced evidence for supersymmetry at the energy scales it was able to probe.[12]

Motivation

Physicist

biogenesis occurs frequently."[14] Among scientists who find the evidence persuasive, a variety of natural explanations have been proposed, such as the existence of multiple universes introducing a survivorship bias under the anthropic principle.[5]

The premise of the fine-tuned universe assertion is that a small change in several of the physical constants would make the universe radically different. Stephen Hawking observed: "The laws of science, as we know them at present, contain many fundamental numbers, like the size of the electric charge of the electron and the ratio of the masses of the proton and the electron. ... The remarkable fact is that the values of these numbers seem to have been very finely adjusted to make possible the development of life."[4]

For example, if the strong nuclear force were 2% stronger than it is (i.e. if the

fuse into them instead of deuterium and helium.[15] This would drastically alter the physics of stars, and presumably preclude the existence of life similar to what we observe on Earth. The diproton's existence would short-circuit the slow fusion of hydrogen into deuterium. Hydrogen would fuse so easily that it is likely that all the universe's hydrogen would be consumed in the first few minutes after the Big Bang.[15] This "diproton argument" is disputed by other physicists, who calculate that as long as the increase in strength is less than 50%, stellar fusion could occur despite the existence of stable diprotons.[16]

The precise formulation of the idea is made difficult by the fact that it is not yet known how many independent physical constants there are. The

standard model of particle physics has 25 freely adjustable parameters and general relativity has one more, the cosmological constant, which is known to be nonzero but profoundly small in value. Because physicists have not developed an empirically successful theory of quantum gravity, there is no known way to combine quantum mechanics, on which the standard model depends, and general relativity.[17]

Without knowledge of this more complete theory suspected to underlie the standard model, it is impossible to definitively count the number of truly independent physical constants. In some candidate theories, the number of independent physical constants may be as small as one. For example, the cosmological constant may be a fundamental constant but attempts have also been made to calculate it from other constants, and according to the author of one such calculation, "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."[17]

Examples

Martin Rees formulates the fine-tuning of the universe in terms of the following six dimensionless physical constants.[1][18]

  • N, the ratio of the electromagnetic force to the gravitational force between a pair of protons, is approximately 1036. According to Rees, if it were significantly smaller, only a small and short-lived universe could exist.[18] If it were large enough, they would repel them so violently that larger atoms would never be generated.
  • Epsilon (ε), a measure of the nuclear efficiency of
    strong nuclear force.[19] If ε were 0.006, a proton could not bond to a neutron, and only hydrogen could exist, and complex chemistry would be impossible. According to Rees, if it were above 0.008, no hydrogen would exist, as all the hydrogen would have been fused shortly after the Big Bang. Other physicists disagree, calculating that substantial hydrogen remains as long as the strong force coupling constant increases by less than about 50%.[16][18]
  • Omega (Ω), commonly known as the
    density parameter, is the relative importance of gravity and expansion energy in the universe. It is the ratio of the mass density of the universe to the "critical density" and is approximately 1. If gravity were too strong compared with dark energy and the initial cosmic expansion rate, the universe would have collapsed before life could have evolved. If gravity were too weak, no stars would have formed.[18][20]
  • Lambda (Λ), commonly known as the cosmological constant, describes the ratio of the density of dark energy to the critical energy density of the universe, given certain reasonable assumptions such as that dark energy density is a constant. In terms of Planck units, and as a natural dimensionless value, Λ is on the order of -3·10−122.[21] This is so small that it has no significant effect on cosmic structures that are smaller than a billion light-years across. A slightly larger value of the cosmological constant would have caused space to expand rapidly enough that stars and other astronomical structures would not be able to form.[18][22]
  • Q, the ratio of the gravitational energy required to pull a large galaxy apart to the energy equivalent of its mass, is around 10−5. If it is too small, no stars can form. If it is too large, no stars can survive because the universe is too violent, according to Rees.[18]
  • D, the number of spatial
    dimensions in spacetime, is 3. Rees claims that life could not exist if there were 2 or 4 spatial dimensions.[18] Rees argues this does not preclude the existence of ten-dimensional strings.[1]

Max Tegmark argued that if there is more than one time dimension, then physical systems' behavior could not be predicted reliably from knowledge of the relevant partial differential equations. In such a universe, intelligent life capable of manipulating technology could not emerge. Moreover, protons and electrons would be unstable and could decay into particles having greater mass than themselves. This is not a problem if the particles have a sufficiently low temperature.[23]

Carbon and oxygen

Further information: Triple-alpha process § Improbability and fine-tuning

An older example is the

strong force must be tuned to a precision of at least 0.5%, and the electromagnetic force to a precision of at least 4%, to prevent either carbon production or oxygen production from dropping significantly.[25]

Explanations

Some explanations of fine-tuning are naturalistic.[26] First, the fine-tuning might be an illusion: more fundamental physics may explain the apparent fine-tuning in physical parameters in our current understanding by constraining the values those parameters are likely to take. As Lawrence Krauss put it, "certain quantities have seemed inexplicable and fine-tuned, and once we understand them, they don't seem to be so fine-tuned. We have to have some historical perspective."[22] Some argue it is possible that a final fundamental theory of everything will explain the underlying causes of the apparent fine-tuning in every parameter.[27][22]

Still, as modern cosmology developed, various hypotheses not presuming hidden order have been proposed. One is a multiverse, where fundamental physical constants are postulated to have different values outside of our own universe.[28][29] On this hypothesis, separate parts of reality would have wildly different characteristics. In such scenarios, the appearance of fine-tuning is explained as a consequence of the weak anthropic principle and selection bias, specifically survivorship bias. Only those universes with fundamental constants hospitable to life, such as on Earth, could contain life forms capable of observing the universe and contemplating the question of fine-tuning in the first place.[30] Zhi-Wei Wang and Samuel L. Braunstein argue that the apparent fine-tuning of fundamental constants could be due to our lack of understanding of these constants.[31]

Multiverse

Main article: Multiverse

If the universe is just one of many and possibly infinite universes, each with different physical phenomena and constants, it is unsurprising that there is a universe hospitable to intelligent life. Some versions of the multiverse hypothesis therefore provide a simple explanation for any fine-tuning,[5] while the analysis of Wang and Braunstein challenges the view that our universe is unique in its ability to support life.[31]

The multiverse idea has led to considerable research into the anthropic principle and has been of particular interest to

Ekpyrotic universe, and the bubble universe theory.[32]
: 220–221 

It has been suggested that invoking the multiverse to explain fine-tuning is a form of the inverse gambler's fallacy.[34][35]

Top-down cosmology

Stephen Hawking and Thomas Hertog proposed that the universe's initial conditions consisted of a superposition of many possible initial conditions, only a small fraction of which contributed to the conditions we see today.[36] On their theory, it is inevitable that we find our universe's "fine-tuned" physical constants, as the current universe "selects" only those histories that led to the present conditions. In this way, top-down cosmology provides an anthropic explanation for why we find ourselves in a universe that allows matter and life, without invoking the ontic existence of the multiverse.[37]

Carbon chauvinism

Some forms of fine-tuning arguments about the formation of life assume that only carbon-based life forms are possible, an assumption sometimes called

alternative biochemistry or other forms of life are possible.[39]

Alien design

One hypothesis is that extra-universal

Cosmologist Alan Guth believes humans will in time be able to generate new universes.[41] By implication, previous intelligent entities may have generated our universe.[42] This idea leads to the possibility that the extra-universal designer/designers are themselves the product of an evolutionary process in their own universe, which must therefore itself be able to sustain life. It also raises the question of where that universe came from, leading to an infinite regress. John Gribbin's Designer Universe theory suggests that an advanced civilization could have deliberately made the universe in another part of the multiverse, and that this civilization may have caused the Big Bang.[43]

Simulation hypothesis

The simulation hypothesis holds that the universe is fine-tuned simply because it is programmed that way by people similar to us but more technologically advanced.[44]

No improbability

Graham Priest, Mark Colyvan, Jay L. Garfield, and others have argued against the presupposition that "the laws of physics or the boundary conditions of the universe could have been other than they are".[45]

Religious apologetics

See also:
Teleological Argument § Fine-tuned universe

Some scientists,

providence or creation are responsible for fine-tuning.[46][47][48][49][50] Christian philosopher Alvin Plantinga
argues 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).

One reaction to these apparent enormous coincidences is to see them as substantiating the theistic claim that the universe has been created by a personal God and as offering the material for a properly restrained theistic argument – hence the fine-tuning argument. It's as if there are a large number of dials that have to be tuned to within extremely narrow limits for life to be possible in our universe. It is extremely unlikely that this should happen by chance, but much more likely that this should happen if there is such a person as God.

— Alvin Plantinga, "The Dawkins Confusion: Naturalism ad absurdum"[51]

evidence for the existence of God or some form of intelligence capable of manipulating (or designing) the basic physics that governs the universe.[52] Philosopher and theologian Richard Swinburne reaches the design conclusion using Bayesian probability.[53] Scientist and theologian Alister McGrath
observed that the fine-tuning of carbon is even responsible for nature's ability to tune itself to any degree.

The entire biological evolutionary process depends upon the unusual chemistry of carbon, which allows it to bond to itself, as well as other elements, creating highly complex molecules that are stable over prevailing terrestrial temperatures, and are capable of conveying genetic information (especially DNA). [...] Whereas it might be argued that nature creates its own fine-tuning, this can only be done if the primordial constituents of the universe are such that an evolutionary process can be initiated. The unique chemistry of carbon is the ultimate foundation of the capacity of nature to tune itself.[54][55]

Theoretical physicist and Anglican priest

Kalam Cosmological Argument strengthens the teleological argument by answering the question "Who designed the Designer?"[57] Creationist Hugh Ross advances a number of fine-tuning hypotheses.[58][59] One is the existence of what Ross calls "vital poisons", which are elemental nutrients that are harmful in large quantities but essential for animal life in smaller quantities.[60]

See also

References

  1. ^ a b c Rees, Martin (May 3, 2001). Just Six Numbers: The Deep Forces That Shape The Universe (1st American ed.). New York: Basic Books. p. 4.
  2. ISBN 0-553-34740-3
  3. ISBN 978-0-61859226-5
    .
  4. ^
    ISBN 0-553-05340-X
    , pp. 7, 125.
  5. ^ a b c "Fine-Tuning". The Stanford Encyclopedia of Philosophy. Center for the Study of Language and Information (CSLI), Stanford University. August 22, 2017. Retrieved January 18, 2020.
  6. OL 6554703M
    .
  7. S2CID 4196678
    .
  8. ^ Heilbron, J. L. The Oxford guide to the history of physics and astronomy, Volume 10 2005, p. 8.
  9. ^ Hoyle, F., The Intelligent Universe (London: Michael Joseph Ltd, 1983).
  10. ^ Profile of Fred Hoyle at OPT Archived 2012-04-06 at the Wayback Machine. Optcorp.com. Retrieved on 2019-08-02.
  11. ^ Rosaler, Joshua (September 20, 2018). "Fine Tuning Is Just Fine: Why it's not such a problem that the Large Hadron Collider hasn't found new physics". Nautil.us. NautilusThink Inc. Retrieved January 18, 2020.
  12. ^ Wolchover, Natalie (November 20, 2012). "As Supersymmetry Fails Tests, Physicists Seek New Ideas". Quanta Magazine. Retrieved January 18, 2020.
  13. ^ Smith, W. S., Smith, J. S., & Verducci, D., eds., Eco-Phenomenology: Life, Human Life, Post-Human Life in the Harmony of the Cosmos (Berlin/Heidelberg: Springer, 2018), pp. 131–32.
  14. S2CID 13282341
    .
  15. ^ a b Paul Davies, 1993. The Accidental Universe, Cambridge University Press, pp. 70–71
  16. ^
    S2CID 119203730
    . Contrary to a common argument that a small increase in the strength of the strong force would lead to destruction of all hydrogen in the Big Bang due to binding of the diproton and the dineutron with a catastrophic impact on life as we know it, we show that provided the increase in strong force coupling constant is less than about 50% substantial amounts of hydrogen remain.
  17. ^
    doi:10.1038/scientificamerican0588-106
    .
  18. ^
    Discover magazine. Kalmbach Publishing Co. Archived from the original
    on July 22, 2014. Retrieved August 23, 2014.
  19. ISBN 978-1118681527
    .
  20. Sean Carroll and Michio Kaku
    (2014). How the Universe Works 3. Vol. End of the Universe. Discovery Channel.
  21. S2CID 55125081
    .
  22. ^ a b c Ananthaswamy, Anil (March 7, 2012). "Is the Universe Fine-Tuned for Life?". Public Broadcasting Service (PBS).
  23. S2CID 15694111
    . Retrieved December 16, 2006.
  24. Schatzman, E. L., & Praderie, F., The Stars (Berlin/Heidelberg: Springer, 1993), pp. 125–27
    .
  25. S2CID 4273737
    .
  26. ^ Hinnells, J., The Routledge Companion to the Study of Religion (Abingdon-on-Thames: Routledge, 2010), pp. 119, 125.
  27. ^ O'Keefe, Madeleine (January 28, 2020). "Fine-tuning versus naturalness". Symmetry Magazine. Retrieved February 18, 2021.
  28. PMID 12701329
    .
  29. ^ Wheeler, J. A., "Genesis and Observership," in R. E. Butts, J. Hintikka, eds., Foundational Problems in the Special Sciences (Dordrecht: D. Reidel, 1977), pp. 3–33.
  30. ISBN 978-0-415-93858-7
    .
  31. ^
    doi:10.1038/s41550-023-02014-9
    .
  32. ^ a b Kaku, M., Parallel Worlds (New York: Doubleday, 2004), pp. 220–221.
  33. ^ "Two Programmes – Horizon, 2010–2011, What Happened Before the Big Bang?". BBC. Retrieved January 2, 2011.
  34. doi:10.1093/mind/XCVI.383.331
    .
  35. ^ Goff, Philip. "Why the Multiverse Can't Explain Fine-Tuning". Retrieved June 8, 2022.
  36. S2CID 122979772
    . Retrieved April 19, 2010.
  37. S2CID 9856127
    .
  38. Stenger, Victor J. "Is The Universe Fine-Tuned For Us?" (PDF). University of Colorado. Archived from the original
    (PDF) on July 16, 2012.
  39. ^ See, e.g. Cohen, J., & Stewart, I.: What Does a Martian Look Like: The Science of Extraterrestrial Life, Wiley, 2002, p. 159.
  40. ^ Dick, S. J., The Impact of Discovering Life Beyond Earth (Cambridge: Cambridge University Press, 2015), p. 59.
  41. ^ Malcolm W. Browne (April 14, 1987). "Physicist Aims to Create a Universe, Literally". The New York Times. Retrieved October 17, 2015.
  42. ^ Science & Nature – Horizon – Parallel Universes – Transcript. BBC (2002-02-14). Retrieved on 2013-03-11.
  43. ^ John Gribbin, In Search of the Multiverse: Parallel Worlds, Hidden Dimensions, and the Ultimate Quest for the Frontiers of Reality, 2010, p. 195
  44. S2CID 171655427
    .
  45. ^ Colyvan, M., Garfield, J. L., & Priest, G. (2005). Problems With the Argument From Fine Tuning. Synthese, 145(3), 325–338
  46. ^ Colyvan et al. (2005). Problems with the Argument from Fine Tuning. Synthese 145: 325–38.
  47. ISBN 1-59102-381-5
    .
  48. ISBN 978-0-691-13355-3
  49. doi:10.1016/S0262-4079(11)61395-X. Archived from the original
    on June 14, 2011.
  50. ISBN 0-631-22129-8
    .
  51. ^ Alvin Plantinga, "The Dawkins Confusion: Naturalism ad absurdum," Christianity Today, March/April 2007
  52. ^ William Lane Craig, "The Teleological Argument and the Anthropic Principle". leaderu.com
  53. ^ 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.
  54. ISBN 978-0664233105
    .
  55. ^ "What is the "fine-tuning" of the universe, and how does it serve as a "pointer to God"?". BioLogos.org. Archived from the original on December 21, 2014.
  56. ^ Polkinghorne, J. C., Science and Theology: An Introduction (London: SPCK, 1998), p. 75.
  57. ^ a b Loke, Andrew (2022). The Teleological and Kalam Cosmological Arguments Revisited. Cham: Palgrave. p. 7.
  58. ^ Reasons to Believe (blog)
  59. ^ Hugh Ross. Improbable Planet: How Earth Became Humanity's Home.
  60. ^ Ross, Hugh (July 1, 1999). "Vital Poisons". Reasons to Believe. Retrieved March 23, 2024.

Further reading

External links

Wikiquote has quotations related to Fine-tuned universe.
Defense of fine-tuning
Criticism of fine tuning
Retrieved from "https://en.wikipedia.org/w/index.php?title=Fine-tuned_universe&oldid=1216245599"