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Universal density profile for cosmic voids.

Nico Hamaus1, P M Sutter2, Benjamin D Wandelt3

  • 1Sorbonne Universités, UPMC Univ Paris 06, UMR 7095, Institut d'Astrophysique de Paris, F-75014 Paris, France and CNRS, UMR 7095, Institut d'Astrophysique de Paris, F-75014 Paris, France.

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Summary
This summary is machine-generated.

We developed a simple function to describe cosmic void density profiles, which is universal across void sizes and redshifts. This model accurately captures void properties and aids in constraining cosmological models.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Large-scale structure formation

Background:

  • Cosmic voids are significant underdense regions in the universe.
  • Understanding their properties is crucial for cosmology.
  • Previous models lacked universality across different scales and redshifts.

Purpose of the Study:

  • To present a simple, universal empirical function for the average density profile of cosmic voids.
  • To provide a framework for relating void populations across different tracers.
  • To enable better comparison between theoretical models, simulations, and observational data.

Main Methods:

  • Identification of cosmic voids using the watershed technique in Lambda-CDM N-body simulations.
  • Development and testing of an empirical density profile function.
  • Derivation of an analytic velocity profile formula based on linear theory.

Main Results:

  • A two-parameter empirical function accurately describes void density profiles universally across size and redshift.
  • The function's parameters relate to scale radius and central density.
  • An analytic velocity profile formula shows excellent agreement with simulation data.

Conclusions:

  • The presented density profile function is a powerful tool for cosmological studies.
  • It offers a universal description applicable to voids in various tracer distributions.
  • This framework facilitates constraining competing models of cosmology and gravity.