Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-24
Phys.Rev.Lett.95:141301,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.95.141301
We present evidence that the simplest particle-physics scalar-field models of dynamical dark energy can be separated into distinct behaviors based on the acceleration or deceleration of the field as it evolves down its potential towards a zero minimum. We show that these models occupy narrow regions in the phase-plane of w and w', the dark energy equation-of-state and its time-derivative in units of the Hubble time. Restricting an energy scale of the dark energy microphysics limits how closely a scalar field can resemble a cosmological constant. These results, indicating a desired measurement resolution of order \sigma(w')\approx (1+w), define firm targets for observational tests of the physics of dark energy.
Caldwell Robert R.
Linder Eric V.
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