A5051610780- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Black Holes and Theoretical Physics
- Remote Sensing in Agriculture
- Geophysics and Gravity Measurements
- Relativity and Gravitational Theory
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Advanced Physical and Chemical Molecular Interactions
- Computational Physics and Python Applications
- Optical Polarization and Ellipsometry
- Simulation Techniques and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Optical Systems and Laser Technology
- Surface and Thin Film Phenomena
- CCD and CMOS Imaging Sensors
- Optical Wireless Communication Technologies
- Plant Water Relations and Carbon Dynamics
Université Paris Cité
2014-2024
Centre National de la Recherche Scientifique
2014-2024
Université Paris Sciences et Lettres
2017-2024
Laboratoire Univers et Théories
2011-2024
Institut Universitaire de France
2024
Janssen (France)
2009-2024
Max Planck Institute for Astronomy
2022
Sorbonne Paris Cité
2017-2020
Délégation Paris 7
2012-2020
Kyoto University
2017-2018
[abridged] We present a detailed comparison of fundamental dark matter halo properties retrieved by substantial number different finders. These codes span wide range techniques including friends-of-friends (FOF), spherical-overdensity (SO) and phase-space based algorithms. further introduce robust (and publicly available) suite test scenarios that allows finder developers to compare the performance their against those presented here. This set includes mock haloes containing various levels...
Using a series of high-resolution N-body hydrodynamical numerical simulations, we investigate several scenarios for the evolution baryon budget in galactic halos. We derive individual halo star formation history (SFH), as well global rate universe. develop simple analytical model that allows us to compute surprisingly accurate predictions, when compared our but also other simulations presented Springel & Hernquist (2003). The depends on two main parameters: time scale t* and wind...
The ever increasing size and complexity of data coming from simulations cosmic structure formation demands equally sophisticated tools for their analysis. During the past decade, art object finding in these has hence developed into an important discipline itself. A multitude codes based upon a huge variety methods techniques have been spawned yet question remained as to whether or not they will provide same (physical) information about structures interest. Here we summarize extent previous...
The universality of the halo mass function is investigated in context dark energy cosmologies. This widely used approximation assumes that can be expressed as a matter density omega_m and rms linear fluctuation sigma only, with no explicit dependence on properties or redshift. In order to test this hypothesis we run series 15 high-resolution N-body simulations for different cosmological models. These consists three LCDM cosmologies best fitting WMAP-1, 3 5 years data, toy-models...
Recent determinations of the mean free path ionising photons (mfp) in intergalactic medium (IGM) at $\rm z=6$ are lower than many theoretical predictions. To gain insight into this issue, we investigate evolution mfp our new massive fully coupled radiation hydrodynamics cosmological simulation reionization: Cosmic Dawn III (CoDaIII). CoDaIII's scale ($\rm 94^3 \, cMpc^3$) and resolution 8192^3$ grid) make it particularly suitable to study IGM during Reionization. The was performed with...
The upcoming generation of galaxy surveys will probe the distribution matter in Universe with unprecedented accuracy. Measurements power spectrum at different scales and red shifts provide stringent constraints on cosmological parameters. However, non-linear this require an accurate evaluation covariance matrix. Here, we compute matrix three-dimensional density for concordance ΛCDM cosmology from ensemble N-body simulations Dark Energy Simulation – Parallel Runs (DEUS-PUR). This consists 12...
The apparent distribution of large-scale structures in the universe is sensitive to velocity/potential sources as well potential along line-of-sight through mapping from real space redshift (redshift-space distortions, RSD). Since odd multipoles halo cross-correlation function vanish when considering standard Doppler RSD, dipole a probe relativistic and wide-angle effects. We build catalogue ten million haloes (Milky-Way size galaxy-cluster size) full-sky light-cone new "RayGalGroupSims"...
Measurements of the sparsity galaxy clusters can be used to probe cosmological information encoded in host dark matter halo profile, and infer constraints on model parameters. Key success these analyses is control potential sources systematic uncertainties. As an example, presence baryons alter cluster with respect predictions from N-body simulations. Similarly, a radial-dependent mass bias, as case masses inferred under hydrostatic equilibrium (HE) hypothesis, affect estimates. First, we...
Dark energy as a quintessence component causes typical modification of the background cosmic expansion, which in addition to its clustering properties, can leave potentially distinctive signature on large scale structures. Many previous studies have investigated this topic, particularly relation non-linear regime structure formation. However, no careful pre-selection viable models with high precision cosmological data was performed. Here we show that has led misinterpretation (and...
The large-scale matter distribution in the late-time Universe exhibits gravity-induced non-Gaussianity, and bispectrum, three-point cumulant is expected to contain significant cosmological information. In particular, measurement of bispectrum helps tighten constraints on dark energy modified gravity through redshift-space distortions. this paper, extending work by Taruya, Nishimichi, Saito [Phys. Rev. D 82, 063522 (2010)], we present a perturbation theory (PT) based model that can keep...
We investigate the non-linear evolution of Baryon Acoustic Oscillations (BAO) in low-redshift matter power spectrum from DEUS-FUR $\Lambda$CDM model simulation. This is first cosmological N-body simulation encompassing full observable cosmic volume, thus allowing variance limited predictions at BAO scales. control effect numerical systematic errors using a series large volume high-resolution simulations. The combined analysis allows us to measure between $z=0$ and $1$ 1% over entire range,...
The linear point (LP), defined as the mid-point between dip and peak of two-point clustering correlation function (TPCF), has been shown to be an excellent standard ruler for cosmology. In fact, it is nearly redshift-independent, being weakly sensitive non-linearities, scale-dependent halo bias redshift-space distortions. So far, these findings were tested assuming that neutrinos are massless; in this paper we extend analysis massive-neutrino cosmologies. particular, examine if growth...
ABSTRACT It has been recently recognized that the observational relativistic effects, mainly arising from light propagation in an inhomogeneous universe, induce dipole asymmetry cross-correlation function of galaxies. In particular, at small scales is shown to be dominated by gravitational redshift effects. this paper, we exploit a simple analytical description for valid quasi-linear regime. contrast previous model, new prescription involves only 1D integrals, providing faster way reproduce...
We study the imprint of dark energy on density profile matter haloes using a set high-resolution large volume cosmological N-body simulations from Dark Energy Universe Simulation Series. first focus analysis goodness fit Navarro–Frenk–White (NFW) which we find to vary with halo mass and redshift. also that fraction ill-fitted by NFW varies cosmology, thus indicating assembly perturbed profiles carries characteristic signature energy. To access this information independently any parametric...
Abstract We present a new cosmological probe for galaxy clusters, the halo sparsity. This characterizes halos in terms of ratio masses measured at two different radii and carries information encoded mass profile. Building on work Balmes et al., we test properties sparsity using catalogs from numerical N -body simulation (2.6 Gpc h −1 ) 3 volume with 4096 particles. show that given redshift average can be predicted prior knowledge function. provides quantitative framework to infer parameter...
We simulate the flux emitted from galaxy halos in order to quantify brightness of circumgalactic medium (CGM). use dedicated zoom-in cosmological simulations with hydrodynamical Adaptive Mesh Refinement code RAMSES, which are evolved down z=0 and reach a maximum spatial resolution 380 $h^{-1}$pc gas mass up 1.8$\times 10^{5} h^{-1} \rm{M}_{\odot}$ densest regions. compute expected emission CGM using CLOUDY emissivity models for different lines (e.g. Ly$\alpha$, CIV, OVI, CVI, OVIII)...
ABSTRACT In order to probe modifications of gravity at cosmological scales, one needs accurate theoretical predictions. N-body simulations are required explore the non-linear regime structure formation but very time consuming. this work, we release a new public emulator, dubbed e-mantis, that performs an and fast interpolation between predictions f(R) modified simulations, run with ecosmog. We sample wide 3D parameter space given by current background scalar field value $10^{-7}\lt...
In this "Invisible Universe" proceedings, we introduce the Dark Energy Universe Simulation Series (DEUSS) which aim at investigating imprints of realistic dark energy models on cosmic structure formation. It represents largest dynamical simulation suite to date in term spatial dynamics. We first present 3 (calibrated latest SNIa and CMB data): LambdaCDM, quintessence with Ratra-Peebles potential, Sugra potential. then isolate various contributions for non-linear matter power spectra from a...
We have performed the first-ever numerical N- body simulation of full observable universe (DEUS "Dark Energy Universe Simulation" FUR "Full Run"). This has evolved 550 billion particles on an Adaptive Mesh Refinement grid with more than two trillion computing points along entire evolutionary history and across 6 order magnitudes length scales, from size Milky Way to that whole universe. To date, this is largest most advanced cosmological ever run. It provides unique information formation...
Observations of colliding galaxy clusters with high relative velocity probe the tail halo pairwise distribution potential providing a powerful test cosmology. As an example it has been argued that discovery Bullet Cluster challenges standard $\Lambda$CDM model predictions. Halo catalogs from N-body simulations have used to estimate probability Bullet-like clusters. However, due simulation volume effects previous studies had rely on Gaussian extrapolation velocities. Here, we perform detail...
The excursion set approach provides a framework for predicting how the abundance of dark matter halos depends on initial conditions. A key ingredient this formalism comes from physics halo formation: specification critical overdensity threshold (barrier) which protohalos must exceed if they are to form bound virialized at later time. Another is statistical, as it requires appropriate statistical ensemble over average when making predictions. explicitly averages all positions, thus implicitly...
We present a parallel implementation of the friends-of-friends algorithm and an innovative technique for reducing complex-shaped data to user-friendly format. This code, named pFoF, contains optimized post-processing workflow that reduces input coming from gravitational codes, arranges them in format detects groups particles using percolation merging methods. The pFoF code also allows detecting structures sub- or non-cubic volumes comoving box. In addition, offers possibility performing new...
ABSTRACT Redshift-space distortions (RSD) in galaxy redshift surveys generally break both the isotropy and homogeneity of distribution. While former aspect is particularly highlighted as a probe growth structure induced by gravity, latter aspect, often quoted wide-angle RSD but ignored most cases, will become important critical to account for increasing statistical precision next-generation surveys. However, impact has been mostly studied using linear perturbation theory. In this paper,...
In this article we compare the halo mass function predicted by excursion set theory with a drifting diffusive barrier against results of N-body simulations for several cosmological models. This includes standard ΛCDM case large range masses, models different types primordial non-Gaussianity, and Ratra-Peebles quintessence model Dark Energy. We show that in all those scenarios, abundance dark matter halos can be described barrier, where two parameters describing have physical content....