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Title: Smooth halos in the cosmic web

Abstract

Dark matter halos can be defined as smooth distributions of dark matter placed in a non-smooth cosmic web structure. This definition of halos demands a precise definition of smoothness and a characterization of the manner in which the transition from smooth halos to the cosmic web takes place. We introduce entropic measures of smoothness, related to measures of inequality previously used in economy and with the advantage of being connected with standard methods of multifractal analysis already used for characterizing the cosmic web structure in cold dark matter N-body simulations. These entropic measures provide us with a quantitative description of the transition from the small scales portrayed as a distribution of halos to the larger scales portrayed as a cosmic web and, therefore, allow us to assign definite sizes to halos. However, these ''smoothness sizes'' have no direct relation to the virial radii. Finally, we discuss the influence of N-body discreteness parameters on smoothness.

Authors:
 [1]
  1. Physics Dept., ETSIAE, IDR, Universidad Politécnica de Madrid, Pza. Cardenal Cisneros 3, E-28040 Madrid (Spain)
Publication Date:
OSTI Identifier:
22525891
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; COSMOLOGY; MANY-BODY PROBLEM; NONLUMINOUS MATTER; ROUGHNESS; SMOOTH MANIFOLDS

Citation Formats

Gaite, José, E-mail: jose.gaite@upm.es. Smooth halos in the cosmic web. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/04/020.
Gaite, José, E-mail: jose.gaite@upm.es. Smooth halos in the cosmic web. United States. doi:10.1088/1475-7516/2015/04/020.
Gaite, José, E-mail: jose.gaite@upm.es. Wed . "Smooth halos in the cosmic web". United States. doi:10.1088/1475-7516/2015/04/020.
@article{osti_22525891,
title = {Smooth halos in the cosmic web},
author = {Gaite, José, E-mail: jose.gaite@upm.es},
abstractNote = {Dark matter halos can be defined as smooth distributions of dark matter placed in a non-smooth cosmic web structure. This definition of halos demands a precise definition of smoothness and a characterization of the manner in which the transition from smooth halos to the cosmic web takes place. We introduce entropic measures of smoothness, related to measures of inequality previously used in economy and with the advantage of being connected with standard methods of multifractal analysis already used for characterizing the cosmic web structure in cold dark matter N-body simulations. These entropic measures provide us with a quantitative description of the transition from the small scales portrayed as a distribution of halos to the larger scales portrayed as a cosmic web and, therefore, allow us to assign definite sizes to halos. However, these ''smoothness sizes'' have no direct relation to the virial radii. Finally, we discuss the influence of N-body discreteness parameters on smoothness.},
doi = {10.1088/1475-7516/2015/04/020},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2015,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}