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Varying constants.

John D Barrow1

  • 1DAMTP, Centre for Mathematical Sciences, Cambridge University, Cambridge CB3 0WA, UK. j.d.barrow@damtp.cam.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|September 9, 2005
PubMed
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This study reviews theories on varying gravitational and fine structure constants. Recent quasar data suggests the fine structure constant may have changed over cosmic time.

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Astrophysics

Background:

  • Theories exploring variations in fundamental physical constants, such as gravitation and the fine structure constant (alpha), are an active area of research.
  • Cosmological models incorporating these variations aim to explain observed phenomena and test fundamental physics.

Purpose of the Study:

  • To review the properties of theories concerning the variation of gravitation and fine structure constants.
  • To highlight general features of cosmological models within these theories.
  • To outline the behavior of a specific class of varying-alpha cosmologies under observational constraints.

Main Methods:

  • Review of theoretical frameworks for varying constants.
  • Analysis of cosmological models incorporating these variations.

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  • Comparison with recent quasar observational data.

    • Main Results:

    • Recent quasar data indicates consistency with a time variation in the fine structure constant since a redshift of 3.5.
    • General features of cosmological models supporting these variations are identified.

    Conclusions:

    • The observed data supports the possibility of a time-varying fine structure constant.
    • Further investigation into varying-alpha cosmologies is warranted in light of observational constraints.