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Article Dans Une Revue Physical Review Letters Année : 2003

Model-Independent Dark Energy Differentiation with the Integrated Sachs-Wolfe Effect

B.A. Bassett
  • Fonction : Auteur
C. Ungarelli
  • Fonction : Auteur
E.J. Copeland
  • Fonction : Auteur

Résumé

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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Dates et versions

hal-02485347 , version 1 (20-02-2020)

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P.S. Corasaniti, B.A. Bassett, C. Ungarelli, E.J. Copeland. Model-Independent Dark Energy Differentiation with the Integrated Sachs-Wolfe Effect. Physical Review Letters, 2003, 90 (9), ⟨10.1103/PhysRevLett.90.091303⟩. ⟨hal-02485347⟩
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