Model-independent dark energy differentiation with the ISW effect

Details Model-independent dark energy differentiation with the ISW effect Model-independent dark energy differentiation with the ISW effect

2002-10-09

arxiv.org/abs/astro-ph/0210209v2

Phys.Rev.Lett. 90 (2003) 091303

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.90.091303

We study the integrated Sachs-Wolfe (ISW) effect using a model-independent parameterization of the dark energy equation of state. Cosmic variance severely restricts the class of models distinguishable from Lambda-CDM. In particular if the present value of the equation of state satisfies w_Q^o <-0.8, the only distinguishable models are those with a rapidly varying equation of state, characterized by a late transition occurring at redshifts z<3. Due to the degeneracy with other cosmological parameters, models with a slowly varying behavior cannot be differentiated from each other or from a cosmological constant using even cosmic variance-limited CMB measurements. This may place a fundamental limit on our understanding of the origin of the presently observed acceleration.

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