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Evolving dark energy with w not = -1.

Lawrence J Hall1, Yasunori Nomura, Steven J Oliver

  • 1Department of Physics, University of California, Berkeley, and Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Physical Review Letters
|October 26, 2005
PubMed
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New theories propose evolving dark energy, deviating from the standard w = -1. This evolving quintessence model, rooted in seesaw cosmology, offers a radiatively stable solution to the "Why now?" problem.

Area of Science:

  • Cosmology
  • Theoretical Physics
  • Particle Physics

Background:

  • The standard cosmological model assumes dark energy is constant (w = -1).
  • Evolving dark energy theories aim to explain cosmic acceleration and address cosmological puzzles.
  • Seesaw cosmology provides a framework linking fundamental physics scales to cosmological phenomena.

Purpose of the Study:

  • To construct theories of evolving quintessence that deviate from the w = -1 prediction.
  • To explain the observed dark energy scale and its evolution using fundamental mass scales.
  • To solve the

Main Methods:

  • Developing theories of evolving quintessence.
  • Applying seesaw cosmology with weak (nu) and Planck (M) scales.

Related Experiment Videos

  • Analyzing the equation of state w(z) for dark energy.

    • Main Results:

    • Theories generically predict deviations from w = -1.
    • A small, radiatively stable mass scale m(phi) ~ 10^-33 eV governs evolution.
    • The

    Conclusions:

    • Evolving quintessence, explained by seesaw cosmology, provides a viable alternative to constant dark energy.
    • The model naturally solves the