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Related Experiment Videos

Testing for w < -1 in the solar system.

Jérôme Martin1, Carlo Schimd, Jean-Philippe Uzan

  • 1Institut d'Astrophysique de Paris, GReCO-CNRS, UMR 7095, Université Pierre et Marie Curie, 98bis boulevard Arago, 75014 Paris, France. jmartin@iap.fr

Physical Review Letters
|April 12, 2006
PubMed
Summary
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Scalar-tensor gravity theories allow dark energy

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Gravitational Physics

Background:

  • Scalar-tensor theories offer alternative gravity models.
  • Dark energy's equation of state parameter, w, can be less than -1 in these theories.
  • Deviations from general relativity are constrained by solar system and pulsar observations.

Purpose of the Study:

  • Establish conditions for dark energy's equation of state (w) to be significantly less than -1.
  • Investigate implications for scalar-tensor gravity theories beyond standard models.
  • Determine how measuring w can probe these alternative gravity theories.

Main Methods:

  • Analysis of energy conditions within scalar-tensor theories.
  • Constraining deviations from general relativity using observational data.

Related Experiment Videos

  • Investigating the role of coupling functions and potentials in these theories.

    • Main Results:

    • Conditions are established for w < -1 without violating energy conditions.
    • Significantly low w values necessitate theories beyond Jordan-Fierz-Brans-Dicke.
    • Steep coupling functions or potentials are required for such low w values.

    Conclusions:

    • Scalar-tensor theories can accommodate dark energy with w < -1.
    • Deviations from general relativity are key, constrained by local tests.
    • Measuring w offers a probe into scalar-tensor gravity models.