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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
Summary
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.
- 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