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 language | English |
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Pages (from-to) | 1-6 |
Number of pages | 6 |
Journal | Astrophysical Journal |
Volume | 548 |
Issue number | 1 PART 1 |
DOIs | |
State | Published - 10 Feb 2001 |
Keywords
- Cosmology: theory
- Large-scale structure of universe