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Testing the spherical evolution of cosmic voids

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)512-519
JournalMonthly Notices of the Royal Astronomical Society
Volume463
Issue number1
Early online date12 Aug 2016
DOIs
StatePublished - 1 Nov 2016

Abstract

We study the spherical evolution model for voids in ΛCDM, where the evolution of voids is governed by dark energy at an earlier time than that for the whole universe or in overdensities. We show that the presence of dark energy suppresses the growth of peculiar velocities, causing void shell-crossing to occur at progressively later epochs as ΩΛ increases. We apply the spherical model to evolve the initial conditions of N-body simulated voids and compare the resulting final void profiles. We find that the model is successful in tracking the evolution of voids with radii greater than 30 h-1 Mpc, implying that void profiles could be used to constrain dark energy. We find that the initial peculiar velocities of voids play a significant role in shaping their evolution. Excluding the peculiar velocity in the evolution model delays the time of shell crossing.

    Research areas

  • cosmology: theory, dark energy, large-scale structure of Universe

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