Effects of dark energy perturbations on cosmological tests of general relativity

@article{Dossett2013EffectsOD,
  title={Effects of dark energy perturbations on cosmological tests of general relativity},
  author={Jason Dossett and Mustapha Ishak},
  journal={Physical Review D},
  year={2013},
  volume={88},
  pages={103008-1-103008-16}
}
Cosmological tests to distinguish between dark energy (DE) and modifications to gravity are a promising route to obtain clues on the origin of cosmic acceleration. We study here the robustness of these tests to the presence of DE density, velocity, and anisotropic stress perturbations. We find that the dispersion in the growth index parameter remains small enough to distinguish between extreme cases of DE models and some commonly used modified gravity models. The sign of the slope parameter for… 
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