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Related Experiment Videos

Can a Changing alpha Explain the Supernovae Results?

Barrow, Magueijo

    The Astrophysical Journal
    |March 15, 2000
    PubMed
    Summary
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    Supernovae data suggesting an accelerating universe may link to a changing fine-structure constant (alpha). Varying speed-of-light (VSL) theories provide a mechanism connecting these cosmological observations.

    Area of Science:

    • Cosmology
    • Theoretical Physics

    Background:

    • Supernovae observations indicate an accelerating universe.
    • Recent discoveries show redshift dependence in the fine-structure constant (alpha).

    Purpose of the Study:

    • To explore the potential relationship between accelerating universe evidence and the observed variation in the fine-structure constant.
    • To investigate varying speed-of-light (VSL) theories as a unifying framework.

    Main Methods:

    • Utilizing a class of varying speed-of-light (VSL) theories with cosmological solutions.
    • Analyzing the behavior of the cosmological constant (Lambda) during different cosmic epochs within VSL frameworks.

    Main Results:

    • VSL theories prevent Lambda from dominating during the radiation-dominated epoch.

    Related Experiment Videos

  • Varying-c effects in VSL theories switch off in the matter-dominated epoch, allowing Lambda to drive acceleration.
  • Residual variations in the speed of light (c) correlate with observed changes in alpha.

    • Conclusions:

    • VSL theories offer a potential explanation for both the accelerating universe and the observed variation in the fine-structure constant.
    • The proposed VSL mechanism aligns with current observational data on cosmic acceleration and alpha's redshift dependence.