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Keywords:

  • cosmology: observations;
  • cosmology: theory;
  • dark energy;
  • dark matter

ABSTRACT

We investigate the spatial properties of the large-scale structure of the Universe in the framework of coupled dark energy (cDE) cosmologies. Using the public halo catalogues from the Coupled Dark Energy Cosmological Simulations (codecs) simulations – the largest set of N-body experiments to date for such cosmological scenarios – we estimate the clustering and bias functions of cold dark matter (CDM) haloes, both in real space and redshift space. Moreover, we investigate the effects of the dark energy (DE) coupling on the geometric and dynamic redshift-space distortions, quantifying the difference with respect to the concordance inline imageCDM model. At inline image, the spatial properties of CDM haloes in cDE models appear very similar to the inline imageCDM case, even if the cDE models are normalized at last scattering in order to be consistent with the latest cosmic microwave background (CMB) data. At higher redshifts, we find that the DE coupling produces a significant scale-dependent suppression of the halo clustering and bias function. This effect, which strongly depends on the coupling strength, is not degenerate with inline image at scales inline image. Moreover, we find that the coupled DE strongly affects both the linear distortion parameter, inline image, and the pairwise peculiar velocity dispersion, inline image. Although the models considered in this work are found to be all in agreement with presently available observational data, the next generation of galaxy surveys will be able to put strong constraints on the level of coupling between DE and CDM exploiting the shape of redshift-space clustering anisotropies.