A Model of Void Formation

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 CDM models and find that our formation model points to $\Lambda$CDM 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.

15 pages, Latex, 5 figures. Accepted for publication in APJ

References in corpus (2)

• The HST Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
• A case devoid of bias: ORS voids vs. IRAS voids

Cited by in corpus (20)

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• A Cosmic Watershed: the WVF Void Detection Technique
• The structure of voids
• Voids in a $\Lambda$CDM Universe
• The abundance of voids and the excursion set formalism
• The Evidence of Absence: Galaxy Voids in the Excursion Set Formalism
• The effect of minihaloes on cosmic reionization
• Voids in the Simulated Local Universe
• Signatures of the Primordial Universe from Its Emptiness: Measurement of Baryon Acoustic Oscillations from Minima of the Density Field
• Evolution of Differentially Rotating Supermassive Stars to the Onset of Bar Instability
• Rotation of Cosmic Voids and Void-Spin Statistics
• Void Scaling and Void Profiles in CDM Models
• Evidence of Quasi-linear Super-Structures in the Cosmic Microwave Background and Galaxy Distribution
• On an Analytical Framework for Voids: Their abundances, density profiles and local mass functions
• Cosmological Black Holes
• Dwarf Galaxies in Voids: Dark Matter Halos and Gas Cooling
• Dynamics of Void and its Shape in Redshift Space
• Cosmological black holes as voids progenitors. I. Simulations
• Non-comoving baryons and cold dark matter in cosmic voids
• $\Lambda$ effect in the cosmological expansion of voids