Skewness as a test of dark energy perturbations

Raquel Emy Fazolo; Luca Amendola; Hermano Velten

Skewness as a test of dark energy perturbations

Cosmology and Nongalactic Astrophysics 2022-05-02 v2

Authors: Raquel Emy Fazolo , Luca Amendola , Hermano Velten

Abstract

We investigate the role played by dark energy perturbations in the skewness $S_3$ of large-scale matter distribution. We consider a two-fluid universe composed by matter and dark energy, with perturbations in both components, and we estimate numerically the skewness of the matter density field as a function of the dark energy parameters. We characterize today's $S_3$ value for quintessence and phantom dark energy cosmologies as well as its dependence on the matter density parameter $\Omega_{m0}$ and the dark energy sound speed $c^2_s$ with accurate numerical fitting. These fits can be used to test cosmology against future high quality data on large scale structure.

Keywords

dark energy perturbations skewness large-scale structure quintessence phantom sound speed

Cite

@article{arxiv.2202.08355,
  title  = {Skewness as a test of dark energy perturbations},
  author = {Raquel Emy Fazolo and Luca Amendola and Hermano Velten},
  journal= {arXiv preprint arXiv:2202.08355},
  year   = {2022}
}

Comments

V2 with new results. It matches the accepted version in PRD. - 11 pages, 10 figures, 4 tables

Skewness as a test of dark energy perturbations

Abstract

Keywords

Cite

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