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- W3104037995 abstract "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." @default.
- W3104037995 created "2020-11-23" @default.
- W3104037995 creator A5042325918 @default.
- W3104037995 creator A5067283643 @default.
- W3104037995 date "2010-10-13" @default.
- W3104037995 modified "2023-09-30" @default.
- W3104037995 title "Dark energy with non-adiabatic sound speed: initial conditions and detectability" @default.
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- W3104037995 doi "https://doi.org/10.1088/1475-7516/2010/10/014" @default.
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