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Related Experiment Videos

Solving the coincidence problem: tracking oscillating energy.

S Dodelson1, M Kaplinghat, E Stewart

  • 1NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA.

Physical Review Letters
|January 3, 2001
PubMed
Summary
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Dark energy, a mysterious cosmic component, may naturally dominate today because it has periodically taken precedence in the universe's past. This cyclical dominance explains its current density, aligning with observational data.

Area of Science:

  • Cosmology
  • Astrophysics
  • Fundamental Physics

Background:

  • Cosmological observations indicate the universe is dominated by dark energy.
  • The current density of dark energy is remarkably close to the critical density.
  • The nature and origin of dark energy remain significant open questions in physics.

Purpose of the Study:

  • To propose a new paradigm for understanding the natural dominance of dark energy today.
  • To explain why dark energy density is of the order of the critical density.
  • To offer a model consistent with current cosmological observations.

Main Methods:

  • Development of a theoretical model with a specific potential for dark energy.
  • Analysis of the model's predictions regarding dark energy's historical dominance.

Related Experiment Videos

  • Comparison of model predictions with existing cosmological data.

    • Main Results:

    • The proposed model suggests dark energy has dominated periodically throughout cosmic history.
    • This periodic dominance naturally leads to its current density being close to the critical density.
    • The model's predictions show consistency with all available observational data.

    Conclusions:

    • The hypothesis of periodic dark energy dominance provides a natural explanation for its present-day abundance.
    • This paradigm offers a viable alternative to existing models of dark energy.
    • Further theoretical and observational studies are warranted to explore this cyclical dark energy concept.