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Space-based experiments constrain screened dark energy models. Near-Earth measurements provide the tightest limits on chameleon, symmetron, and dilaton theories, excluding previously allowed parameter space.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Fundamental Physics

Background:

  • Screened dark energy models propose modifications to gravity.
  • Testing these models requires precise measurements of gravitational effects.

Purpose of the Study:

  • To test screened dark energy models using near-Earth, space-based measurements.
  • To derive bounds on chameleon, symmetron, and dilaton models.

Main Methods:

  • Calculated post-Newtonian corrections to geodetic precession (Gravity Probe B), LAGEOS-2 pericenter advance, and Sagnac delay.
  • Analyzed data from space-based experiments and projected sensitivities of future clock configurations.

Main Results:

  • LAGEOS-2 provided the strongest Earth-orbit constraints for symmetron and dilaton models.
  • A Sagnac experiment with state-of-the-art space clock sensitivity yielded the tightest constraint for chameleon models.
  • Excluded previously allowed parameter space for screened dark energy models.

Conclusions:

  • Low-density, space-based experiments are sensitive probes of screened dark energy.
  • Future Sagnac tests at nuclear-clock precision could exclude the entire chameleon parameter space considered.