A model of void formation

Yasmin Friedmann*, Tsvi Piran

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We introduce a simple model for the formation of voids. In this model the underdensity of galaxies in voids is the product of two factors. The first arises from a gravitational expansion of the negative density perturbation. The second is due to biasing: galaxies are less likely to form in an underdense region. One feature of the model is an upper cutoff in void sizes. We calculate the volume-filling factor of characteristic voids for different cold dark matter (CDM) models and find that our formation model points to ACDM models as preferred models of the power spectrum. A natural consequence of our model is that the underdensity of the dark matter inside voids is smaller than the galaxy underdensity.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalAstrophysical Journal
Volume548
Issue number1 PART 1
DOIs
StatePublished - 10 Feb 2001

Keywords

  • Cosmology: theory
  • Large-scale structure of universe

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