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Related Experiment Videos

Constraining inverse-curvature gravity with supernovae.

Olga Mena1, José Santiago, Jochen Weller

  • 1Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA.

Physical Review Letters
|February 21, 2006
PubMed
Summary

Modified gravity models with inverse curvature powers explain cosmic acceleration without dark energy. Analysis of supernovae data shows an excellent fit, but requires more than just baryonic matter.

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Area of Science:

  • Cosmology
  • General Relativity
  • Modified Gravity Theories

Background:

  • The accelerated expansion of the Universe is typically attributed to dark energy.
  • Alternative theories, such as modified gravity, are explored to explain this phenomenon without invoking dark energy.
  • Solar system experiments provide stringent tests for theories of gravity.

Purpose of the Study:

  • To investigate generalized modified gravity models with inverse powers of curvature as an alternative explanation for cosmic acceleration.
  • To determine if these models can fit observational data without dark energy and remain consistent with solar system tests.

Main Methods:

  • Solving the Friedmann equations for the complete dynamical range of the Universe's evolution.
  • Analyzing supernova data within the framework of inverse-curvature gravity models.

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  • Applying constraints from the current expansion rate and age of the Universe.

    • Main Results:

    • Generalized modified gravity models with inverse curvature powers provide an excellent fit to supernova data.
    • These models can explain the accelerated expansion of the Universe without requiring dark energy.
    • Consistency with solar system experiments is maintained.

    Conclusions:

    • Inverse-curvature gravity models offer a viable alternative to dark energy for explaining cosmic acceleration.
    • The matter content of the Universe in these models is constrained to be between 0.07 and 0.21 (95% C.L.).
    • These models necessitate a matter component beyond just baryonic matter to fully explain cosmic dynamics.