Simulating Structure Formation of the Local Universe

Abstract

In this work we present cosmological N-body simulations of the Local Universe with initial conditions constrained by the Two-Micron Redshift Survey (2MRS) within a cubic volume of 180 Mpc/h side-length centred at the Local Group. We use a self-consistent Bayesian based approach to explore the joint parameter space of primordial density fluctuations and peculiar velocity fields, which are compatible with the 2MRS galaxy distribution after cosmic evolution. This method (the KIGEN-code) includes the novel ALPT (Augmented Lagrangian Perturbation Theory) structure formation model which combines second order LPT (2LPT) on large scales with the spherical collapse model on small scales. Furthermore we describe coherent flows with 2LPT and include a dispersion term to model fingers-of-god (fogs). These implementations are crucial to avoid artificial filamentary structures, which appear when using a structure formation model with 2LPT and data with compressed fogs. We assume LCDM cosmology throughout our method. The recovered initial Gaussian fields are used to perform a set of 25 constrained simulations. Statistically this ensemble of simulations is in agreement with a reference set of 25 simulations based on randomly seeded Gaussian fluctuations in terms of matter statistics, power-spectra and mass functions. Considering the entire volume, we obtain correlation coefficients of about 98.3% for the comparison between the simulated density fields and the galaxy density field in log-space with Gaussian smoothing scales of r_S=3.5 Mpc/h (74% for r_S=1.4 Mpc/h). The cross power-spectra show correlations with the galaxy distribution which weaken towards smaller length scales until they vanish at scales of 2.2-3.0 Mpc/h. The simulations we present provide a fully nonlinear density and velocity field with a high level of correlation with the observed galaxy distribution at scales of a few Mpc.

accepted by MNRAS; 14 pages containing 11 figures, submitted to MNRAS; version2: moderate revision of text, Fig. 6,Fig11

References in corpus (9)

• The velocity function in the local environment from LCDM and LWDM constrained simulations
• Dwarf Galaxies and the Cosmic Web
• Bayesian reconstruction of the cosmological large-scale structure: methodology, inverse algorithms and numerical optimization
• The Challenge of the Largest Structures in the Universe to Cosmology
• Reconstructing the Initial Density Field of the Local Universe: Method and Test with Mock Catalogs
• Spherical collapse model with shear and angular momentum in dark energy cosmologies
• Cosmic Structure and Dynamics of the Local Universe
• Quantifying distortions of the Lagrangian dark-matter mesh in cosmology
• Is the misalignment of the Local Group velocity and the 2MASS Redshift Survey dipole typical in a LambdaCDM model?

Cited by in corpus (52)

• Tracing the cosmic web
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: mock galaxy catalogues for the BOSS Final Data Release
• Detecting filamentary pattern in the cosmic web: a catalogue of filaments for the SDSS
• Galaxy spin alignment in filaments and sheets: observational evidence
• Modelling Baryon Acoustic Oscillations with Perturbation Theory and Stochastic Halo Biasing
• Large-scale dark matter simulations
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field I: Hamiltonian Markov Chain Monte Carlo Method with Particle Mesh Dynamics
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field III: Constrained Simulation in the SDSS Volume
• Past and present cosmic structure in the SDSS DR7 main sample
• Simulations of ultra-high Energy Cosmic Rays in the local Universe and the origin of Cosmic Magnetic Fields
• Search for Extremely Metal-poor Galaxies in the Sloan Digital Sky Survey (II): high electron temperature objects
• Simulations of the Local Universe Constrained by Observational Peculiar Velocities
• Genetically modified halos: towards controlled experiments in $\Lambda$CDM galaxy formation
• Bayesian analysis of the dynamic cosmic web in the SDSS galaxy survey
• COSMIC BIRTH: Efficient Bayesian Inference of the Evolving Cosmic Web from Galaxy Surveys
• The Persistent Percolation of Single-Stream Voids
• The cosmic web of the Local Universe: cosmic variance, matter content and its relation to galaxy morphology
• Dark matter voids in the SDSS galaxy survey
• Extremely Metal-Poor Galaxies: The Environment
• Dark Matter in the Local Universe
• Quadratic genetic modifications: a streamlined route to cosmological simulations with controlled merger history
• Voids and the Cosmic Web: cosmic depressions & spatial complexity
• Predicted future fate of COSMOS galaxy protoclusters over 11 Gyr with constrained simulations
• BIRTH of the COSMOS Field: Primordial and Evolved Density Reconstructions During Cosmic High Noon
• The Cosmic V-Web
• Galaxy clusters in simulations of the local Universe: a matter of constraints
• Truthing the stretch: Non-perturbative cosmological realizations with multiscale spherical collapse
• The Clustering of Galaxies in the Completed SDSS-III Baryon Oscillation Spectroscopic Survey: Cosmic Flows and Cosmic Web from Luminous Red Galaxies
• Not a Copernican observer: biased peculiar velocity statistics in the local Universe
• Bayesian cosmic density field inference from redshift space dark matter maps
• ELUCID -- Exploring the Local Universe with the reConstructed Initial Density field. II: Reconstruction diagnostics, applied to numerical halo catalogs
• Towards Accurate Field-Level Inference of Massive Cosmic Structures
• Cosmic flows and the expansion of the Local Universe from nonlinear phase-space reconstructions
• Mapping Lyman-alpha forest three-dimensional large scale structure in real and redshift space
• Predicting Structures in the Zone of Avoidance
• Bayesian redshift-space distortions correction from galaxy redshift surveys
• Virgo: an unlikely cluster of galaxies because of its environment
• Field-Based Physical Inference From Peculiar Velocity Tracers
• Merger types forming the Virgo cluster in recent gigayears
• The large-scale structure around the Fornax-Eridanus Complex
• Cosmological distances with general-relativistic ray tracing: framework and comparison to cosmographic predictions
• Analysis of spin directions of galaxies in the DESI Legacy Survey
• Constraining the baryon fraction in the Warm Hot Intergalactic Medium at low redshifts with PLANCK data
• Uneven flows: On cosmic bulk flows, local observers, and gravity
• The Zeldovich & Adhesion approximations, and applications to the local universe
• Revisiting the large-scale CMB anomalies: The impact of the SZ signal from the Local Universe
• Spherical collapse and cluster number counts in dark energy models disformally coupled to dark matter
• The cosmic spiderweb: equivalence of cosmic, architectural, and origami tessellations
• Cosmic Web & Caustic Skeleton: non-linear Constrained Realizations -- 2D case studies
• Evaluating the variance of individual halo properties in constrained cosmological simulations
• Bayesian Cosmic Web Reconstruction: BARCODE for Clusters
• Differentiable Fuzzy Cosmic-Web for Field Level Inference