The secondary infall model of galactic halo formation and the spectrum of cold dark matter particles on Earth

Abstract

The spectrum of cold dark matter particles on Earth is expected to have peaks in velocity space associated with particles which are falling onto the Galaxy for the first time and with particles which have fallen in and out of the Galaxy only a small number of times in the past. We obtain estimates for the velocity magnitudes and the local densities of the particles in these peaks. To this end we use the secondary infall model of galactic halo formation which we have generalized to take account of the angular momentum of the dark matter particles. The new model is still spherically symmetric and it admits self-similar solutions. In the absence of angular momentum, the model produces flat rotation curves for a large range of values of a parameter $\epsilon$ which is related to the spectrum of primordial density perturbations. We find that the presence of angular momentum produces an effective core radius, i.e. it makes the contribution of the halo to the rotation curve go to zero at zero radius. The model provides a detailed description of the large scale properties of galactic halos including their density profiles, their extent and total mass. We obtain predictions for the kinetic energies of the particles in the velocity peaks and estimates for their local densities as functions of the amount of angular momentum, the age of the universe and $\epsilon$.

LaTeX, 39 pages including 18 figures

Cited by in corpus (117)

• Non-Baryonic Dark Matter - Observational Evidence and Detection Methods
• Invisible Axion Search Methods
• Annual Modulation of Dark Matter: A Review
• Cosmic Ray Neutrino Annihilation on Relic Neutrinos Revisited: A Mechanism for Generating Air Showers above the Greisen-Zatsepin-Kuzmin Cut-off
• Generation of Vorticity and Velocity Dispersion by Orbit Crossing
• Studies of the motion and decay of axion walls bounded by strings
• Annual Modulation of Dark Matter in the Presence of Streams
• The structure of dark matter halos in hierarchical clustering theories
• Cosmic axion thermalization
• On the origin of cold dark matter halo density profiles
• The Cusp/Core problem and the Secondary Infall Model
• WIMP Annual Modulation with Opposite Phase in Late-Infall Halo Models
• Directional Sensitivity, WIMP Detection, and the Galactic Halo
• Directional statistics for WIMP direct detection
• Caustic rings of dark matter
• The phase-space structure of a dark-matter halo: Implications for dark-matter direct detection experiments
• Diurnal and Annual Modulation of Cold Dark Matter Signals
• The caustic ring singularity
• Effect of halo modelling on WIMP exclusion limits
• Constraints on Stupendously Large Black Holes
• Self-similar spherical collapse with non-radial motions
• Angular Signatures for Galactic Halo WIMP Scattering in Direct Detectors: Prospects and Challenges
• The Caustic Ring Model of the Milky Way Halo
• Small-scale clumps of dark matter
• Evidence for Ring Caustics in the Milky Way
• Spherical collapse model with shear and angular momentum in dark energy cosmologies
• Signatures of Hierarchical Clustering in Dark Matter Detection Experiments
• The Case for Axion Dark Matter
• Formation and internal structure of superdense dark matter clumps and ultracompact minihaloes
• Density profile slope in Dwarfs and environment
• Cores and Cusps in Warm Dark Matter Halos
• On Universal Halos and the Radial Orbit Instability
• On the Density profile slope of Clusters of Galaxies
• Shear and rotation in Chaplygin cosmology
• Non-radial motion and the NFW profile
• Extended Spherical Collapse and the Accelerating Universe
• Surface Density of dark matter haloes on galactic and cluster scales
• Neutralino Gamma-ray Signals from Accreting Halo Dark Matter
• Caustics in growing Cold Dark Matter Haloes
• Reconstructing the Velocity Distribution of WIMPs from Direct Dark Matter Detection Data
• Universal properties of Dark Matter halos
• Directional recoil rates for WIMP direct detection
• The Inner Caustics of Cold Dark Matter Halos
• Self-Similar Dynamical Relaxation of Dark Matter Halos in an Expanding Universe
• Theoretical Directional and Modulated Rates for Direct SUSY Dark Matter Detection
• Infall caustics in dark matter halos?
• Relaxing and Virializing a Dark Matter Halo
• Superdense cosmological dark matter clumps
• Axion Dark Matter and Cosmological Parameters
• Axions and the Galactic Angular Momentum Distribution
• Formation of cuspy density profiles - a generic feature of collisionless gravitational collapse
• What sets the central structure of dark matter haloes?
• Constraints on dark matter-nucleon effective couplings in the presence of kinematically distinct halo substructures using the DEAP-3600 detector
• Searching for Supersymmetric Dark Matter - The Directional Rate and the Modulation Effect Due to Caustic Rings
• The modulation effect for supersymmetric dark matter detection with asymmetric velocity dispersion
• Destruction of axion miniclusters in the Galaxy
• Gravitational cooling and density profile near caustics in collisionless dark matter haloes
• Solar Wakes of Dark Matter Flows
• Nonspherical similarity solutions for dark halo formation
• Phase-space structure of protohalos: Vlasov versus Particle-Mesh
• Indirect search for dark matter: prospects for GLAST
• A potential WIMP signature for the caustic ring halo model
• Self-Similar Spherical Collapse with Tidal Torque
• Fine Structure of Dark Matter Halos and its Effect on Terrestrial Detection Experiments
• Robustness of Discrete Flows and Caustics in Cold Dark Matter Cosmology
• Relaxation of a Collisionless System and the Transition to a New Equilibrium Velocity Distribution
• Modulation Sensitive Search for Non-Virialized Dark-Matter Axions
• Evidence for universal structure in galactic halos
• Does the Second Caustic Ring of Dark Matter Cause the Monoceros Ring of Stars ?
• Probing dark matter streams with CoGeNT
• The flat density profiles of massive, and relaxed galaxy clusters
• Supersymmetry and Cosmology
• Self-similar collapse and the structure of dark matter halos: A fluid approach
• Gaseous Dark Matter Detectors
• Directional detection of Dark Matter
• Phase-space structure of cold dark matter halos inside splashback: multi-stream flows and self-similar solution
• New astrophysical bounds on ultralight axionlike particles
• On the direct detection of extragalactic WIMPs
• Dark matter caustics and the enhancement of self-annihilation flux
• Gravitational Lensing by Dark Matter Caustics
• A further look at particle annihilation in dark matter caustics
• Hierarchical Phase Space Structure of Dark Matter Haloes: Tidal debris, Caustics, and Dark Matter annihilation
• Probing dark matter caustics with weak lensing
• Simulated evolution of the dark matter large-scale structure
• Detailed theoretical predictions of the outskirts of dark matter halos
• Calculating exclusion limits for Weakly Interacting Massive Particle direct detection experiments without background subtraction
• DM particles: how warm they can be?
• The role of shell crossing on the existence and stability of trapped matter shells in spherical inhomogeneous Λ-CDM models
• A solution to the problems of cusps and rotation curves in dark matter halos in the cosmological standard model
• WIMP annihilation in caustics
• Cold dark matter protohalo structure around collapse: Lagrangian cosmological perturbation theory versus Vlasov simulations
• Sensitivity of Proposed Search for Axion-induced Magnetic Field using Optically Pumped Magnetometers
• Velocity Structure of Self-Similar Spherically Collapsed Halos
• Evolution of velocity dispersion along cold collisionless flows
• Gravitational Lensing and Structural Stability of Dark Matter Caustic Rings
• Phase-space structure analysis of self-gravitating collisionless spherical systems
• Resolving infall caustics in dark matter halos
• SUSY dark matter --A collider Physicist's Perspective--
• Effects of a caustic ring of dark matter on the distribution of stars and interstellar gas
• Fast DAQ system with image rejection for axion dark matter searches
• Improved Lemaitre-Tolman model and the mass and turn-around radius in group of galaxies II: the role of dark energy
• Dark Matter Caustics in Galaxy Clusters
• Semiclassical S-matrix for black holes
• Omega_B and Omega_0 From MACHOs and Local Group Dynamics
• Caustics, cold flows, and annual modulation
• The gravitational force field of proto-pancakes
• Improved Lemaitre-Tolman model and the mass and turn-around radius in group of galaxies
• Spherical accretion of collisional gas in modified gravity I: self-similar solutions and a new cosmological hydrodynamical code
• Probing Cold Dark Matter Cusps by Gravitational Lensing
• The Cosmic Ray Signature of Dark Matter Caustics
• Effects of a dark matter caustic passing through the Oort cloud
• DAMA and the self similar infall halo model
• Mergers of Binary Primordial Black Holes in Evolving Dark Matter Halos
• Dark matter halo dynamics in 2D Vlasov Simulations: a self-similar approach
• Testing universal dark-matter caustic rings with galactic rotation curves
• Dynamical friction shear and rotation in Chaplygin cosmology
• The nine rings of the galaxy LEDA 1313424