Dark energy with non-adiabatic sound speed: initial conditions and detectability

Details Dark energy with non-adiabatic sound speed: initial conditions and detectability Dark energy with non-adiabatic sound speed: initial conditions and detectability

2010-04-30

arxiv.org/abs/1004.5509v3

JCAP 1010:014,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 2 figures, version accepted in JCAP

Scientific paper

10.1088/1475-7516/2010/10/014

Assuming that the universe contains a dark energy fluid with a constant linear equation of state and a constant sound speed, we study the prospects of detecting dark energy perturbations using CMB data from Planck, cross-correlated with galaxy distribution maps from a survey like LSST. We update previous estimates by carrying a full exploration of the mock data likelihood for key fiducial models. We find that it will only be possible to exclude values of the sound speed very close to zero, while Planck data alone is not powerful enough for achieving any detection, even with lensing extraction. We also discuss the issue of initial conditions for dark energy perturbations in the radiation and matter epochs, generalizing the usual adiabatic conditions to include the sound speed effect. However, for most purposes, the existence of attractor solutions renders the perturbation evolution nearly independent of these initial conditions.

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