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Model-independent dark energy differentiation with the integrated Sachs-Wolfe effect
P S Corasaniti1, B A Bassett, C Ungarelli
1Centre for Theoretical Physics, University of Sussex, Falmer, Brighton, BN1 9QJ, United Kingdom.
Abstract:
We study the integrated Sachs-Wolfe effect using a model-independent parametrization of the dark energy equation of state, w(z). Cosmic variance severely restricts the class of models distinguishable from one based on cold dark matter and a cosmological constant unless w(z) currently satisfies w(o)(Q)>-0.8, or exhibits a rapid, late-time, transition at redshifts z<3. Because of the degeneracy with other cosmological parameters, models with a slowly varying w(z) cannot be differentiated from each other or from a cosmological constant. This may place a fundamental limit on our understanding of the origin of the currently observed acceleration.
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