The Lyman-Alpha Forest in the Cold 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.

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SIMULATED VOID GALAXIES IN THE STANDARD COLD DARK MATTER MODEL

The Astrophysical Journal ◽

10.1088/0004-637x/735/2/132 ◽

2011 ◽

Vol 735 (2) ◽

pp. 132 ◽

Cited By ~ 29

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

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The Cold Dark Matter Model: Does It Work?

Annals of the New York Academy of Sciences ◽

10.1111/j.1749-6632.1991.tb32215.x ◽

1991 ◽

Vol 647 (1 Texas/ESO-Cer) ◽

pp. 649-658 ◽

Cited By ~ 1

Author(s):

CARLOS S. FRENK

Keyword(s):

Dark Matter ◽

Cold Dark Matter ◽

Cold Dark Matter Model ◽

Matter Model ◽

Dark Matter Model

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Redshift space clustering of galaxies and cold dark matter model

The Astrophysical Journal ◽

10.1086/186835 ◽

1993 ◽

Vol 408 ◽

pp. L77 ◽

Cited By ~ 13

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

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Statefinder diagnostic for exponential harmonic field

International Journal of Modern Physics A ◽

10.1142/s0217751x20501614 ◽

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.

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