The effects of non-Gaussian initial conditions on the structure and substructure of cold dark matter halos
@article{AvilaReese2003TheEO, title={The effects of non-Gaussian initial conditions on the structure and substructure of cold dark matter halos}, author={Vladimir Avila-Reese and P.Col'in and G. Piccinelli and Claudio Firmani}, journal={The Astrophysical Journal}, year={2003}, volume={598}, pages={36-48} }
We study the structure and substructure of halos obtained in N-body simulations for a ΛCDM cosmology with non-Gaussian initial conditions. The initial statistics are lognormal in the gravitational potential field with positive (LNp) and negative (LNn) skewness; the sign of the skewness is conserved by the density field, and the power spectrum is the same for all the simulations. Our aim is not to test a given non-Gaussian statistics but to explore the generic effect of positive- and negative…
Figures and Tables from this paper
18 Citations
Cosmic shear statistics in cosmologies with non-Gaussian initial conditions
- Physics
- 2010
We computed the power spectrum of weak cosmic shear in models with non-Gaussian primordial density fluctuations. Cosmological initial condit ions deviating from Gaussianity have recently attracted…
The effects of primordial non-Gaussianity on giant-arc statistics
- Physics
- 2011
For over a decade, it has been debated whether the concordance A cold dark matter (ACDM) model is consistent with the observed abundance of giant arcs in clusters. While previous theoretical studies…
Imprints of primordial non-Gaussianities on large-scale structure: Scale-dependent bias and abundance of virialized objects
- Physics
- 2008
We study the effect of primordial non-Gaussianity on large-scale structure, focusing upon the most massive virialized objects. Using analytic arguments and N-body simulations, we calculate the mass…
The Dependence on Environment of Cold Dark Matter Halo Properties
- Physics
- 2005
A series of high-resolution ΛCDM cosmological N-body simulations are used to study the properties of galaxy-size dark halos as a function of global environment. We analyze halos in three types of…
Imprints of primordial non-Gaussianity on the number counts of cosmic shear peaks
- Physics
- 2011
We studied the effect of primordial non-Gaussianity with varied bispectrum shapes on the number counts of signal-to-noise ratio peaks in wide-field cosmic shear maps. The two cosmological…
The case for non-Gaussianity on cluster scales
- Physics
- 2004
We address whether possible scale-dependent deviations from Gaussianity in the primordial density field that are consistent with the cosmic microwave background observations could explain the…
Power spectrum normalization and the non‐Gaussian halo model
- Physics
- 2004
The normalization of the matter power spectrum, σ 8 , is an essential ingredient to predict the phenomenology of the low-redshift Universe. It has been measured using several methods, such as X-ray…
Cluster abundances and Sunyaev–Zel'dovich power spectra: effects of non-Gaussianity and early dark energy
- Physics
- 2007
In the standard A cold dark matter cosmological model with a Gaussian primordial density fluctuation field, the relatively low value of the mass variance parameter (σ8 = 0.74 +0.05 -0.05 , obtained…
Projection effects in the strong lensing study of subhaloes
- Physics
- 2017
The defining characteristic of the cold dark matter (CDM) hypothesis is the presence of a very large number of low-mass haloes, too small to have made a visible galaxy. Other hypotheses for the…
Constraining primordial non-Gaussianity with cosmological weak lensing: shear and flexion
- Physics
- 2012
We examine the cosmological constraining power of future large-scale weak lensing surveys on the model of the ESA planned mission Euclid, with particular reference to primordial non-Gaussianity. Our…
References
SHOWING 1-10 OF 104 REFERENCES
Non-Gaussian initial conditions in cosmological N-body simulations — I. Space-uncorrelated models
- PhysicsMonthly Notices of the Royal Astronomical Society
- 1990
Results are reported on N-body simulations of the large-scale structure of the Universe starting from non-Gaussian, space-uncorrelated, initial conditions: specifically, we consider two…
Substructure and Halo Density Profiles in a Warm Dark Matter Cosmology
- Physics
- 2000
We performed a series of high-resolution collisionless N-body simulations designed to study the substructure of Milky Way-size galactic halos (host halos) and the density profiles of halos in a warm…
Formation and Structure of Halos in a Warm Dark Matter Cosmology
- Physics
- 2000
Using high-resolution cosmological N-body simulations, we study how the density profiles of dark matter halos are affected by the filtering of the density power spectrum below a given scale length…
On the Origin of the Inner Structure of Halos
- Physics
- 2003
We calculate by means of the Press-Schechter formalism the density profile developed by dark matter halos during accretion, i.e., the continuous aggregation of small clumps. We find that the shape of…
How Universal Are the Density Profiles of Dark Halos
- Physics
- 1999
We use high-resolution N-body simulations to investigate the formation of virialized halos due to the gravitational collapse of collisionless matter. A variety of formation scenarios are studied,…
On the Formation and Evolution of Disk Galaxies: Cosmological Initial Conditions and the Gravitational Collapse
- Physics
- 1997
We use a semianalytical approach and the standard σ8 = 1 cold dark matter (SCDM) cosmological model to study the gravitational collapse and virialization, the structure, and the global and…
Resolving the Structure of Cold Dark Matter Halos
- Physics
- 2001
We present results of a convergence study in which we compare the density profiles of cold dark matter halos simulated with varying mass and force resolutions. We show that although increasing the…
Density profiles of dark matter haloes: diversity and dependence on environment
- Physics
- 1999
We study the outer density profiles of dark matter haloes predicted by a generalized secondary infall model and observed in a dissipationless cosmological simulation of a low-density flat cold dark…
A Universal Density Profile from Hierarchical Clustering
- Physics
- 1997
We use high-resolution N-body simulations to study the equilibrium density profiles of dark matter halos in hierarchically clustering universes. We find that all such profiles have the same shape,…
The Power Spectrum Dependence of Dark Matter Halo Concentrations
- Physics
- 2001
High-resolution N-body simulations are used to examine the power spectrum dependence of the concentration of galaxy-sized dark matter halos. It is found that dark halo concentrations depend on the…