Precision Determination of the Mass Function of Dark Matter Halos
TLDR
In this article, the authors determined the mass function in the concordance ΛCDM cosmology, as well as its uncertainty, using sixteen 10243 particle nested-volume dark matter simulations spanning a mass range of over 5 orders of magnitude.Abstract:
The predicted mass function of dark matter halos is essential in connecting observed galaxy-cluster counts and models of galaxy clustering to the properties of the primordial density field. We determine the mass function in the concordance ΛCDM cosmology, as well as its uncertainty, using sixteen 10243 particle nested-volume dark matter simulations spanning a mass range of over 5 orders of magnitude. Using the nested volumes and single-halo tests, we find and correct for a systematic error in the friends-of-friends halo-finding algorithm. We find a fitting form and full error covariance for the mass function that successfully describes the simulations' mass function and is well behaved outside the simulations' resolutions. Estimated forecasts of uncertainty in cosmological parameters from future cluster-count surveys receive a negligible contribution from remaining statistical uncertainties in the central cosmology multiplicity function. There exists a potentially nonnegligible cosmological dependence (nonuniversality) of the halo multiplicity function.read more
Citations
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Introducing the Illustris Project: simulating the coevolution of dark and visible matter in the Universe
Mark Vogelsberger,Shy Genel,Volker Springel,Volker Springel,Paul Torrey,Debora Sijacki,Dandan Xu,Gregory F. Snyder,Dylan Nelson,Lars Hernquist +9 more
TL;DR: The Illustris Project as mentioned in this paper is a series of large-scale hydrodynamical simulations of galaxy formation, which includes primordial and metal-line cooling with self-shielding corrections, stellar evolution, stellar feedback, gas recycling, chemical enrichment, supermassive black hole growth, and feedback from active galactic nuclei.
Journal ArticleDOI
Toward a halo mass function for precision cosmology: The Limits of universality
Jeremy L. Tinker,Andrey V. Kravtsov,Anatoly Klypin,Kevork N. Abazajian,Michael S. Warren,Gustavo Yepes,Stefan Gottlöber,Daniel E. Holz +7 more
TL;DR: In this paper, the mass function of dark matter halos is measured in a large set of collisionless cosmological simulations of flat ΛCDM cosmology and investigated its evolution at -->z 2.5.
Journal ArticleDOI
Dark Energy and the Accelerating Universe
Abstract: Ten years ago, the discovery that the expansion of the universe is accelerating put in place the last major building block of the present cosmological model, in which the universe is composed of 4% baryons, 20% dark matter, and 76% dark energy. At the same time, it posed one of the most profound mysteries in all of science, with deep connections to both astrophysics and particle physics. Cosmic acceleration could arise from the repulsive gravity of dark energy—for example, the quantum energy of the vacuum—or it may signal that general relativity (GR) breaks down on cosmological scales and must be replaced. We review the present observational evidence for cosmic acceleration and what it has revealed about dark energy, discuss the various theoretical ideas that have been proposed to explain acceleration, and describe the key observational probes that will shed light on this enigma in the coming years.
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Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
Alexey Vikhlinin,Andrey V. Kravtsov,R. A. Burenin,Harald Ebeling,William R. Forman,Allan Hornstrup,Christine Jones,S. S. Murray,Daisuke Nagai,Hernan Quintana,A. Voevodkin +10 more
TL;DR: In this article, Chandra observations of large samples of galaxy clusters detected in X-rays by ROSAT provide a new, robust determination of the cluster mass functions at low and high redshifts.
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Cosmological Parameters from Observations of Galaxy Clusters
TL;DR: In this paper, the authors review current cosmological results obtained from observations of galaxy clusters and highlight several areas of opportunity for the next few years, and emphasize the need for accurate modeling of survey selection and sources of systematic error.
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TL;DR: The Particle Data Group's biennial review as discussed by the authors summarizes much of Particle Physics using data from previous editions plus new measurements from papers, and evaluate and average measured properties of gauge bosons leptons quarks mesons and baryons.