Publications (18)
Precision cosmology in muddy waters: Cosmological constraints and N-body codes
Robert E. Smith, Darren S. Reed, Doug Potter +3
Future large-scale structure surveys of the Universe will aim to constrain the cosmological model and the true nature of dark energy with unprecedented accuracy. In order for these…
Haloes gone MAD: The Halo-Finder Comparison Project
Alexander Knebe, Steffen R. Knollmann, Stuart I. Muldrew +34
[abridged] We present a detailed comparison of fundamental dark matter halo properties retrieved by a substantial number of different halo finders. These codes span a wide range of…
Decaying Dark Matter: Simulations and Weak-Lensing Forecast
Jonathan Hubert, Aurel Schneider, Doug Potter +2
Despite evidence for the existence of dark matter (DM) from very high and low redshifts, a moderate amount of DM particle decay remains a valid possibility. This includes both mode…
Quantifying the heart of darkness with GHALO - a multi-billion particle simulation of our galactic halo
Joachim Stadel, Doug Potter, Ben Moore +5
We perform a series of simulations of a Galactic mass dark matter halo at different resolutions, our largest uses over three billion particles and has a mass resolution of 1000 M_s…
Concentration, Spin and Shape of Dark Matter Haloes: Scatter and the Dependence on Mass and Environment
Andrea V. Maccio', Aaron A. Dutton, Frank C. van den Bosch +3
We use a series of cosmological N-body simulations for a flat LCDM cosmology to investigate the properties of dark matter haloes in the mass range 3.0e9-3.0e13 Msun. These properti…
Cold Dark Matter Substructures in Early-Type Galaxy Halos
Davide Fiacconi, Piero Madau, Doug Potter +1
We present initial results from the "Ponos" zoom-in numerical simulations of dark matter substructures in massive ellipticals. Two very highly resolved dark matter halos with $M_{\…
Fundamental differences between SPH and grid methods
Oscar Agertz, Ben Moore, Joachim Stadel +17
We have carried out a hydrodynamical code comparison study of interacting multiphase fluids. The two commonly used techniques of grid and smoothed particle hydrodynamics (SPH) show…
An alternative to grids and glasses: Quaquaversal pre-initial conditions for N-body simulations
Steen H. Hansen, Oscar Agertz, Michael Joyce +3
N-body simulations sample their initial conditions on an initial particle distribution, which for cosmological simulations is usually a glass or grid, whilst a Poisson distribution…
Dark Satellites and Cosmic Reionization
Andrea V. Maccio', Ben Moore, Joachim Stadel +1
A possible explanation of the present discrepancy between the abundance of galactic subhaloes predicted by N-Body simulations with those observed in the Local Group is presented. W…
Euclid preparation: II. The EuclidEmulator -- A tool to compute the cosmology dependence of the nonlinear matter power spectrum
Euclid Collaboration, Mischa Knabenhans, Joachim Stadel +12
We present a new power spectrum emulator named EuclidEmulator that estimates the nonlinear correction to the linear dark matter power spectrum. It is based on a spectral decomposit…
Toward an accurate mass function for precision cosmology
Darren S. Reed, Robert E. Smith, Doug Potter +3
Cosmological surveys aim to use the evolution of the abundance of galaxy clusters to accurately constrain the cosmological model. In the context of LCDM, we show that it is possibl…
The same with less: The cosmic web of warm versus cold dark matter dwarf galaxies
Darren S. Reed, Aurel Schneider, Robert E. Smith +3
We explore fundamental properties of the distribution of low mass dark matter halos within the cosmic web using warm dark matter (WDM) and cold dark matter (CDM) cosmological simul…
The Graininess of Dark Matter Haloes
Marcel Zemp, Jürg Diemand, Michael Kuhlen +5
We use the recently completed one billion particle Via Lactea II LambdaCDM simulation to investigate local properties like density, mean velocity, velocity dispersion, anisotropy,…
Matter power spectrum and the challenge of percent accuracy
Aurel Schneider, Romain Teyssier, Doug Potter +7
Future galaxy surveys require one percent precision in the theoretical knowledge of the power spectrum over a large range including very nonlinear scales. While this level of accur…
Subhaloes gone Notts: the clustering properties of subhaloes
Arnau Pujol, Enrique Gaztanaga, Carlo Giocoli +13
We present a study of the substructure finder dependence of subhalo clustering in the Aquarius Simulation. We run 11 different subhalo finders on the haloes of the Aquarius Simulat…
Subhaloes gone Notts: Spin across subhaloes and finders
Julian Onions, Yago Ascasibar, Peter Behroozi +15
We present a study of a comparison of spin distributions of subhaloes found associated with a host halo. The subhaloes are found within two cosmological simulation families of Milk…
Structure Finding in Cosmological Simulations: The State of Affairs
Alexander Knebe, Frazer R. Pearce, Hanni Lux +32
The ever increasing size and complexity of data coming from simulations of cosmic structure formation demands equally sophisticated tools for their analysis. During the past decade…
Major Mergers Going Notts: Challenges for Modern Halo Finders
Peter Behroozi, Alexander Knebe, Frazer R. Pearce +7
Merging haloes with similar masses (i.e., major mergers) pose significant challenges for halo finders. We compare five halo finding algorithms' (AHF, HBT, Rockstar, SubFind, and VE…