Structure Formation with Cold + Hot Dark Matter

Abstract

We report results from high-resolution particle-mesh (PM) N-body simulations of structure formation in an $\Omega =1$ cosmological model with a mixture of Cold plus Hot Dark Matter (C+HDM) having ${\Omega }_{\mathrm{cold}}=0.6$, ${\Omega }_{\nu }=0.3$, and ${\Omega }_{\mathrm{baryon}}=0.1$. We present analytic fits to the C+HDM power spectra for both cold and hot ($\nu$) components, which provide initial conditions for our nonlinear simulations. In order to sample the neutrino velocities adequately, these simulations included six times as many neutrino particles as cold particles. Our simulation boxes were 14, 50, and 200~Mpc cubes (with $H_0=50$ km s${}^{-1}$ Mpc${}^{-1}$); we also did comparison simulations for Cold Dark Matter (CDM) in a 50~Mpc box. C+HDM with linear bias factor $b=1.5$ is consistent both with the COBE data and with the galaxy correlations we calculate. We find the number of halos as a function of mass and redshift in our simulations; our results for both CDM and C+HDM are well fit by a Press-Schechter model. The number density of galaxy-mass halos is smaller than for CDM, especially at redshift $z>2$, but the numbers of cluster-mass halos are comparable. We also find that on galaxy scales the neutrino velocities and flatter power spectrum in C+HDM result in galaxy pairwise velocities that are in good agreement with the data, and about 30\% smaller than in CDM with the same biasing factor. On scales of several tens of Mpc, the C+HDM streaming velocities are considerably larger than CDM. Thus C+HDM looks promising as a model of structure formation.

33pp., 16+ figures not included (available by mail), SCIPP-92/52

Cited by in corpus (121)

• Supersymmetric Dark Matter
• Dark Matter Self-interactions and Small Scale Structure
• Power Spectra for Cold Dark Matter and its Variants
• Cosmology with a Primordial Scaling Field
• A New Dark Matter Candidate: Non-thermal Sterile Neutrinos
• The Cold Dark Matter Density Perturbation
• Study of Constrained Minimal Supersymmetry
• The density and peculiar velocity fields of nearby galaxies
• Cosmological-Parameter Determination with Microwave Background Maps
• Spatial correlation function and pairwise velocity dispersion of galaxies: CDM models versus the Las Campanas Survey
• Galaxy Formation Theory
• Massive Neutrinos and the Non-linear Matter Power Spectrum
• Evolution of Structure in the Intergalactic Medium and the Nature of the Ly-alpha Forest
• CMB Observables and Their Cosmological Implications
• The effect of neutrinos on the matter distribution as probed by the Intergalactic Medium
• Toward Understanding CMB Anisotropies and Their Implications
• Cold + Hot Dark Matter Cosmology with $m({\nu }_{\mu })\approx m({\nu }_{\tau })\approx 2.4$ ev
• Large-scale dark matter simulations
• The Cosmic Microwave Background and Particle Physics
• The Effect of Thermal Neutrino Motion on the Non-linear Cosmological Matter Power Spectrum
• Impact of massive neutrinos on nonlinear matter power spectrum
• The Mira-Titan Universe II: Matter Power Spectrum Emulation
• The Mira-Titan Universe: Precision Predictions for Dark Energy Surveys
• WIMPs in a 3-3-1 model with heavy Sterile neutrinos
• Velocity bias in a LCDM model
• Non-linear Power Spectrum including Massive Neutrinos: the Time-RG Flow Approach
• Nonlinear power spectrum in the presence of massive neutrinos: perturbation theory approach, galaxy bias and parameter forecasts
• An SO(10)XS-4 Scenario for Naturally Degenerate Neutrinos
• Multipartite Interacting Scalar Dark Matter in the light of updated LUX data
• Two-Component Dark Matter
• Spherical Harmonic Analysis of the PSCz Galaxy Catalogue: Redshift distortions and the real-space power spectrum
• Initial Conditions for Accurate N-Body Simulations of Massive Neutrino Cosmologies
• The impact of massive neutrinos on the abundance of massive clusters
• Chaotic Amplification of Neutrino Chemical Potentials by Neutrino Oscillations in Big Bang Nucleosynthesis
• Light Gravitinos as Mixed Dark Matter
• N-Body Simulations of Alternate Gravity Models
• Scaling in the Universe
• SO(10) grand unification model for degenerate neutrino masses
• Determining the Amplitude of Mass Fluctuations in the Universe
• Radiative Seesaw Mechanism at Weak Scale
• Active-active and active-sterile neutrino oscillation solutions to the atmospheric neutrino anomaly
• Limits on Neutrino Mass from Cosmic Structure Formation
• Accomodating Solar and Atmospheric Neutrino Deficits, Hot Dark Matter, and a Double Beta Decay Signal
• Constraints on the Cosmic Structure Formation Models from Early Formation of Giant Galaxies
• An Infrared Cutoff Revealed by the Two Years of COBE-DMR Observations of Cosmic Temperature Fluctuations
• Is a Massive Tau Neutrino Just What Cold Dark Matter Needs?
• The APM cluster-galaxy cross-correlation function : Constraints on Omega and galaxy bias
• Cosmological simulations in MOND: the cluster scale halo mass function with light sterile neutrinos
• Upper bound on Hot Dark Matter Density from $SO(10)$ Yukawa Unification
• Suite of Hydrodynamical Simulations for the Lyman-Alpha Forest with Massive Neutrinos
• Studies of galaxies in voids. I. HI observations of Blue Compact Galaxies
• New multi-zoom method for N-body simulations: application to galaxy growth by accretion
• Confrontation of Double-Inflationary Models with Observations
• Blue perturbation spectra from inflation
• Pionic Dark Matter
• Constraining the Power Spectrum using Clusters
• Lyman-α Forest and Cosmic Weak Lensing in a Warm Dark Matter Universe
• Violent Relaxation of Indistinguishable Objects and Neutrino Hot Dark Matter in Clusters of Galaxies
• Just-So Oscillation: as Just as MSW?
• Toward Understanding Environmental Effects in SDSS Clusters
• Polytropic dark matter flows illuminate dark energy and accelerated expansion
• Three Neutrino $\Delta m^2$ scales and Singular Seesaw Mechanism
• Sizes, Shapes, and Correlations of Lyman Alpha Clouds and Their Evolution in the CDM$+\Lambda$ Universe
• Cold Plus Hot Dark Matter Cosmology in the Light of Solar and Atmospheric Neutrino Oscillations
• Global cluster morphology and its evolution: X-ray data vs CDM, LCDM and mixed models
• Spurious Small-Scale Structure & Discreteness-Driven Relaxation in Cosmological Simulations
• Euclid: Modelling massive neutrinos in cosmology -- a code comparison
• Decaying Neutrinos and Large Scale Structure Formation
• Discovery prospects with the Dark-photons & Axion-Like particles Interferometer
• Bounds on Neutrino Transition Magnetic Moments in Random Magnetic Fields
• Dark Energy: The Shadowy Reflection of Dark Matter?
• Dark matter constraints in the minimal and nonminimal SUSY standard model
• Dark matter constraints on the parameter space and particle spectra in the nonminimal SUSY standard model
• The Effect of Thermal Velocities on Structure Formation in N-body Simulations of Warm Dark Matter
• Seeking Observable Imprints of Small-Scale Structure on the Properties of Dark Matter Haloes
• The VVV Near-IR Galaxy Catalogue beyond the Galactic disk
• Mixed dark matter with neutrino chemical potentials
• Polynomial Hybrid Inflation
• The Higgs sector of the SUSY reduced 3-3-1 model
• Effect of random magnetic field on active-sterile neutrino conversion in the supernova core
• Geodesic motion and phase-space evolution of massive neutrinos
• Clustering of loose groups and galaxies from the Perseus--Pisces Survey
• The Space Density of Galaxy Peaks and the Linear Matter Power Spectrum
• Inflation and Mixed Dark Matter Models
• Redshift Evolution of the Nonlinear Two-Point Correlation Function
• Realistic SUSY model with four fermion families, natural R parity and ${\nu }_{\tau }$ in the eV Range
• Boltzmann hierarchies for self-interacting warm dark matter scenarios
• New Supernova Constraints on active-sterile neutrino conversions
• Testing Cold Dark Matter Models At Moderate to High Redshift
• A New Approach to Probing Large Scale Power with Peculiar Velocities
• The Small Scale Velocity Dispersion of Galaxies: A Comparison of Cosmological Simulations
• The Status of Neutrino Mass
• Cosmic Structure Formation
• Cluster mass function in mixed models
• Constraining Mixed Dark Matter models with high redshift Lyman-alpha forest data
• The Hubble Rate Trouble: An Effective Field Theory of Dark Matter
• Improving initialization and evolution accuracy of cosmological neutrino simulations
• A Simple Model of Large Scale Structure Formation
• Kinetic Field Theory for Cosmic Structure Formation
• Cosmological perturbations in the $\Lambda$CDM-like limit of a polytropic dark matter model
• COZMIC. II. Cosmological Zoom-in Simulations with Fractional non-CDM Initial Conditions
• MeV Tau Neutrino: Astrophysical and Cosmological Constraints and Mischief
• Cosmological Neutrino Entanglement and Quantum Pressure
• Self-Interacting Dark Matter in Cosmology: accurate numerical implementation and observational constraints
• Modified Cold-Dark-Matter models in light of 53W091 an old galaxy at high z
• Disoriented Sleptons
• A Warm-Plus-Hot Dark Matter Universe
• A Single Scale Theory for Cold and Hot Dark Matter
• A Cosmological Three Level Neutrino Laser
• AGN candidates in the VVV near-IR galaxy catalogue
• Neutrinos Properties Beyond the Standard Model
• Mixed dark matter with low-mass bosons
• Cosmological implications of neutrinos
• Using dust to constrain dark matter models
• Anthropic Origin of the Neutrino Mass from Cooling Failure
• Discreteness effects in $N$-body simulations of warm dark matter
• Doublet-Singlet Oscillations and Dark Matter Neutrinos
• Cluster Correlation in Mixed Models
• Neutrino Oscillations from Dirac and Majorana Masses
• Neutrinos and Physics Beyond the Standard Model
• The Primordial Perturbation Spectrum and Large Scale Structure