scholarly journals The evolution of Lyman-break galaxies in the cold dark matter model

2011 ◽  
Vol 412 (3) ◽  
pp. 1828-1852 ◽  
Author(s):  
C. G. Lacey ◽  
C. M. Baugh ◽  
C. S. Frenk ◽  
A. J. Benson
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Lyman Break Galaxies ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model

Velocity Bias in a Λ Cold Dark Matter Model

2000 ◽  
Vol 539 (2) ◽  
pp. 561-569 ◽  
Author(s):  
Pedro Colin ◽  
Anatoly A. Klypin ◽  
Andrey V. Kravtsov
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model ◽  
Velocity Bias

scholarly journals The Milky Way’s halo and subhaloes in self-interacting dark matter

2019 ◽  
Vol 490 (2) ◽  
pp. 2117-2123 ◽  
Author(s):  
Victor H Robles ◽  
Tyler Kelley ◽  
James S Bullock ◽  
Manoj Kaplinghat
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Elastic Cross Section ◽  
Too Big To Fail ◽  
Density Profiles ◽  
Potential Core ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Satellite Galaxies ◽  
Dark Matter Model

ABSTRACT We perform high-resolution simulations of an MW-like galaxy in a self-interacting cold dark matter model with elastic cross-section over mass of $1~\rm cm^2\, g^{-1}$ (SIDM) and compare to a model without self-interactions (CDM). We run our simulations with and without a time-dependent embedded potential to capture effects of the baryonic disc and bulge contributions. The CDM and SIDM simulations with the embedded baryonic potential exhibit remarkably similar host halo profiles, subhalo abundances, and radial distributions within the virial radius. The SIDM host halo is denser in the centre than the CDM host and has no discernible core, in sharp contrast to the case without the baryonic potential (core size ${\sim}7 \, \rm kpc$). The most massive subhaloes (with $V_{\mathrm{peak}}\gt 20 \, \rm km\, s^{-1}$) in our SIDM simulations, expected to host the classical satellite galaxies, have density profiles that are less dense than their CDM analogues at radii less than 500 pc but the deviation diminishes for less massive subhaloes. With the baryonic potential included in the CDM and SIDM simulations, the most massive subhaloes do not display the too-big-to-fail problem. However, the least dense among the massive subhaloes in both these simulations tend to have the smallest pericenter values, a trend that is not apparent among the bright MW satellite galaxies.

scholarly journals SIMULATED VOID GALAXIES IN THE STANDARD COLD DARK MATTER MODEL

2011 ◽  
Vol 735 (2) ◽  
pp. 132 ◽  
Author(s):  
Kathryn Kreckel ◽  
M. Ryan Joung ◽  
Renyue Cen
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Void Galaxies ◽  
Matter Model ◽  
Dark Matter Model

Redshift space clustering of galaxies and cold dark matter model

1993 ◽  
Vol 408 ◽  
pp. L77 ◽  
Author(s):  
Neta A. Bahcall ◽  
Renyue Cen ◽  
Mirt Gramann
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matter Model

Statefinder diagnostic for exponential harmonic field

2020 ◽  
Vol 35 (26) ◽  
pp. 2050161
Author(s):  
A. D. Kanfon ◽  
F. Mavoa ◽  
G. Koto N’Gobi
Keyword(s):  
Dark Matter ◽  
Numerical Analysis ◽  
Cold Dark Matter ◽  
Specific Method ◽  
Statefinder Parameters ◽  
Harmonic Field ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
The Universe ◽  
Dark Matter Model

The dynamic study of the harmonic exponential field has been made using the statefinder diagnostic. By the use of a specific method, we find out the statefinder parameters [Formula: see text], [Formula: see text] according to the deceleration parameter and the redshift. The numerical analysis of these parameters brings out the transition between the accelerated and decelerated phases of the universe. There is also an attracting effect from the SCDM (Standard Cold Dark Matter) model toward the LCDM model ([Formula: see text]CDM). In view of the results this study allows us to classify the exponential harmonic field among the quintessential models.

scholarly journals Dark Matters on the Scale of Galaxies

Universe ◽  
2020 ◽  
Vol 6 (8) ◽  
pp. 107 ◽  
Author(s):  
Ivan de Martino ◽  
Sankha S. Chakrabarty ◽  
Valentina Cesare ◽  
Arianna Gallo ◽  
Luisa Ostorero ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Cold Dark Matter ◽  
Research Field ◽  
Cold Dark Matter Model ◽  
Matter Model ◽  
Dark Matters ◽  
Theory Of Gravity ◽  
Different Origins ◽  
Dark Matter Model

The cold dark-matter model successfully explains both the emergence and evolution of cosmic structures on large scales and, when we include a cosmological constant, the properties of the homogeneous and isotropic Universe. However, the cold dark-matter model faces persistent challenges on the scales of galaxies. Indeed, N-body simulations predict some galaxy properties that are at odds with the observations. These discrepancies are primarily related to the dark-matter distribution in the innermost regions of the halos of galaxies and to the dynamical properties of dwarf galaxies. They may have three different origins: (1) the baryonic physics affecting galaxy formation is still poorly understood and it is thus not properly included in the model; (2) the actual properties of dark matter differs from those of the conventional cold dark matter; (3) the theory of gravity departs from General Relativity. Solving these discrepancies is a rapidly evolving research field. We illustrate some of the solutions proposed within the cold dark-matter model, and solutions when including warm dark matter, self-interacting dark matter, axion-like particles, or fuzzy dark matter. We also illustrate some modifications of the theory of gravity: Modified Newtonian Dynamics (MOND), MOdified Gravity (MOG), and f(R) gravity.

INFLATION AFTER WMAP

2011 ◽  
Vol 20 (08) ◽  
pp. 1471-1477
Author(s):  
KIN-WANG NG
Keyword(s):  
Dark Matter ◽  
Large Scale ◽  
Cold Dark Matter ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Microwave Background ◽  
Cold Dark Matter Model ◽  
Cosmic Microwave Background Anisotropy ◽  
Matter Model ◽  
Reflection Asymmetry ◽  
Dark Matter Model

Recent measurements of the large-scale cosmic microwave background anisotropy made by the Wilkinson Microwave Anisotropy Probe (WMAP) mission indicate a reflection asymmetry, an axis of evil, a low quadrupole, and a few multipoles deviated from predicted in the cold dark matter model with a cosmological constant. All of these may give us a hint about the physics of inflation during the first few e-folds or during the inflating period. Efforts taken along this direction will be reviewed and our recent work will be discussed.

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