Number counts and dynamical vacuum cosmologies

N. Chandrachani Devi, H. A. Borges, S. Carneiro, J. S. Alcaniz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

We study non-linear structure formation in an interacting model of the dark sector of the Universe in which the dark energy density decays linearly with the Hubble parameter, ρΛ ∝H, leading to a constant-rate creation of cold dark matter. We derive all relevant expressions to calculate the mass function and the cluster number density using the Sheth-Torman formalism and show that the effect of the interaction process is to increase the number of bound structures of large masses (M≳ 1014M h-1) when compared to the standard Λ cold dark matter model. Since these models are not reducible to each other, this number counts signature can in principle be tested in future surveys.

Original languageEnglish
Pages (from-to)37-41
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume448
Issue number1
Early online date2 Feb 2015
DOIs
Publication statusPublished - 21 Mar 2015
Externally publishedYes

Keywords

  • Cosmological parameters
  • Dark energy
  • Distance scale
  • Large-scale structure of Universe

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