The signature of dark energy perturbations in galaxy cluster surveys

Abstract

All models of dynamical dark energy possess fluctuations, which affect the number of galaxy clusters in the Universe. We have studied the impact of dark energy clustering on the number of clusters using a generalization of the spherical collapse model and the Press-Schechter formalism. Our statistical analysis is performed in a 7-parameter space using the Fisher matrix method, for several hypothetical Sunyaev-Zel'dovich and weak lensing (shear maps) surveys. In some scenarios, the impact of these fluctuations is large enough that their effect could already be detected by existing instruments such as the South Pole Telescope, when its data is combined with WMAP and SDSS. Future observations could go much further and probe the nature of dark energy by distinguishing between different models on the basis of their perturbations, not only their expansion histories.

5 pages, 4 figures

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Cited by in corpus (13)

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• Effects of shear and rotation on the spherical collapse model for clustering dark energy
• On the implementation of the spherical collapse model for dark energy models
• A short review on clustering dark energy
• Confronting the sound speed of dark energy with future cluster surveys
• Spherical collapse of dark matter haloes in tidal gravitational fields
• Sub-horizon evolution of cold dark matter perturbations through dark matter-dark energy equivalence epoch
• Effects of tidal gravitational fields in clustering dark energy models
• Improved Lemaitre-Tolman model and the mass and turn-around radius in group of galaxies II: the role of dark energy
• The growth of DM and DE perturbations in DBI non-canonical scalar field scenario
• Improved Lemaitre-Tolman model and the mass and turn-around radius in group of galaxies
• Tidal virialization of dark matter haloes with clustering dark energy
• Effects of dynamical friction on perturbations for evolving dark energy