منابع مشابه
The Imaginary Starobinsky Model
The recent detection by the BICEP2 collaboration of a high level of tensor modes seems to exclude the Starobinsky model of inflation. In this paper we show that this conclusion can be avoided: one can embed the Starobinsky model in supergravity and identify the inflaton field with the imaginary (instead of the real) part of the chiral scalaron multiplet in its formulation. Once coupled to matte...
متن کاملGalaxy clustering and galaxy bias in a Lambda CDM universe
We investigate galaxy clustering and the correlations between galaxies and mass in the ΛCDM cosmological model (inflationary cold dark matter with Ωm = 0.4, ΩΛ = 0.6, h = 0.65, n = 0.95, σ8 = 0.8), using a large, smoothed particle hydrodynamics simulation (SPH, with 2 × 144 particles in a 50hMpc cube). Simulated galaxies can be unambiguously identified as clumps of stars and cold gas a few kpc ...
متن کاملEvolution of Clustering and Bias in a Lambda-CDM Universe
We determine the evolution from z = 3 → 0 of the galaxy and mass correlation functions and bias factor in a 50hMpc ΛCDM hydrodynamic simulation with 10hkpc resolution. The mass correlation function grows with time, but the galaxy correlation function shows little evolution and is well described by a power law. At early times, galaxies are biased traces of mass, with bias being higher on smaller...
متن کاملGravitational-Mass Imaging of CDM Substructure
I propose the novel method of “gravitational-mass imaging” to detect and quantify luminous and dark-matter substructure in gravitational-lens galaxies. The method utilizes highly-magnified Einstein rings and arcs as sensitive probes of small perturbations in the lens potential (due to the presence of mass substructure), reconstructing the gravitational lens potential non-parametrically. Simulat...
متن کاملEvolution of Mass Distribution in CDM Halos
On the basis of a new convergence study of high-resolution N-body simulations, my colleagues and I now agree that the Navarro, Frenk, & White (1996) density profile ρNFW (r) ∝ r (r + rs) −2 is a good representation of typical dark matter halos of galactic mass. Comparing simulations of the same halo with numbers of particles ranging from ∼ 10 to ∼ 10, we have also shown that rs, the radius wher...
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ژورنال
عنوان ژورنال: American Journal of Modern Physics
سال: 2016
ISSN: 2326-8867
DOI: 10.11648/j.ajmp.20160501.11