Results 121 to 130 of about 2,655,258 (212)

Accelerating Massive Galaxy Formation with Primordial Black Hole Seed Nuclei

The Astronomical Journal
If massive primordial black holes (PBHs) exist and constitute a fraction of the dark matter, they can dramatically catalyze galaxy formation. By acting as pre-existing, high-density seeds, they can shorten the galaxy assembly time to as little as 100 Myr
Jeremy Mould
doaj   +1 more source

Red Galaxies Growing in Dark Matter Halos

, 2009
To understand the slow growth of massive galaxies at z < 1, we have modeled how these galaxies populate dark matter halos. The models are constrained with the observed luminosity function and clustering of z < 1 red galaxies.
Michael J. I. Brown, null null
core   +1 more source

The influence of baryons on the mass distribution of dark matter halos

, 2006
Using a set of high-resolution N-body/SPH cosmological simulations with identical initial conditions but run with different numerical setups, we investigate the influence of baryonic matter on the mass distribution of dark halos when radiative cooling is
W. P. Lin, I. G. McCarthy, McCarthy, I. G., Jing, Y. P., Gao, L., Mao, S., S. Mao, Y. P. Jing, Lin, W. P., L. Gao   +9 more
core   +1 more source

Dark energy and extended dark matter halos

, 2012
The cosmological mean matter (dark and baryonic) density measured in the units of the critical density is Ωm = 0.27. Independently, the local mean density is estimated to be Ωloc = 0.08−0.23 from recent data on galaxy groups at redshifts up to z = 0.01−0.
P. Teerikorpi, V. P. Dolgachev, L. M. Domozhilova, G. G. Byrd, A. D. Chernin, M. J. Valtonen   +5 more
core   +1 more source

Observational Signatures of Dark Matter Vortices in Ultralight Bosonic Halos via Gravitational Lensing

The Astrophysical Journal Letters
Ultralight bosonic dark matter (ULDM) is an interesting and promising dark matter candidate. While the wavelike nature of ULDM has been widely studied in the literature, we explore another distinctive feature of ULDM as a Bose–Einstein condensate (BEC ...
Rongzi Zhou, Dylan M. H. Leung, Jason S. C. Poon, Ming-Chung Chu   +3 more
doaj   +1 more source

Hydro-Gravitational Dynamics of Planets and Dark Energy

Journal of Applied Fluid Mechanics, 2009
Self gravitational fluid mechanical methods termed hydro-gravitational-dynamics (HGD) predict plasma fragmentation 0.03 Myr after the turbulent big bang to form protosuperclustervoids, turbulent protosuperclusters, and protogalaxies at the 0.3 Myr ...
Carl H. Gibson, R.E, Schild
doaj  

Solving Milky Way–sized Systems with Haskap Pie: A Halo Finding Algorithm with Efficient Sampling, K-means Clustering, Tree-assembly, Particle Tracking, Python Modules, Intercode Applicability, and Energy Solving

The Astrophysical Journal
We describe a new Python-based stand-alone halo finding algorithm, Haskap Pie , that combines several methods of halo finding and tracking into a single calculation. Our halo-finder flexibly solves halos for simulations produced by eight simulation codes
Kirk S. S. Barrow, Thịnh Hữu Nguyễn, Edward Skrabacz   +2 more
doaj   +1 more source

The AIDA-TNG project: Abundance, radial distribution, and clustering properties of halos in alternative dark matter models

Astronomy & Astrophysics
Warm and self-interactive dark matter cosmologies have been proposed as nonbaryonic solutions to the tensions between the Λ cold dark matter model and observations at the kiloparsec scale.
Romanello M., Despali G., Marulli F., Giocoli C., Moscardini L., Vogelsberger M.   +5 more
doaj   +1 more source

Chameleon gravity as an alternative to dark matter

European Physical Journal C: Particles and Fields
By studying the chameleon gravity on galaxy scales, we investigate the effects of the chameleon dark matter. To perform this task, we consider the dynamics of the chameleon scalar field in the region of galactic halos in static spherically symmetric ...
Raziyeh Zaregonbadi, Nasim Saba, Mehrdad Farhoudi   +2 more
doaj   +1 more source

The Dependence of Dark Matter Halo Properties on the Morphology of Their Central Galaxies from Weak Lensing

The Astrophysical Journal
Xu & Jing reported a monotonic relationship between the host halo mass M _h and the morphology of massive central galaxies, characterized by the Sérsic index n , at fixed stellar mass, suggesting that morphology could serve as a good secondary proxy for ...
Zhenjie Liu, Kun Xu, Jun Zhang, Wenting Wang, Cong Liu   +4 more
doaj   +1 more source