On the Degeneracy Inherent in Observational Determination of the Dark Energy Equation of State

Details On the Degeneracy Inherent in Observational Determination of the Dark Energy Equation of State On the Degeneracy Inherent in Observational Determination of the Dark Energy Equation of State

2002-03-08

arxiv.org/abs/astro-ph/0203137v2

Phys.Rev. D66 (2002) 123511

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures. Several references added

Scientific paper

10.1103/PhysRevD.66.123511

Using a specific model for the expansion rate of the Universe as a function of scale factor, it is demonstrated that the equation of state of the dark energy cannot be determined uniquely from observations at redshifts $z\lesssim{\rm a few}$ unless the fraction of the mass density of the Universe in nonrelativistic particles, $\Omega_M$, somehow can be found independently. A phenomenological model is employed to discuss the utility of additional constraints from the formation of large scale structure and the positions of CMB peaks in breaking the degeneracy among models for the dark energy.

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