Dark Matter Caustics

Abstract

Caustics are a generic feature of the nonlinear growth of structure in the dark matter distribution. If the dark matter were absolutely cold, its mass density would diverge at caustics, and the integrated annihilation probability would also diverge for individual particles participating in them. For realistic dark matter candidates, this behaviour is regularised by small but non-zero initial thermal velocities. We present a mathematical treatment of evolution from Hot, Warm or Cold Dark Matter initial conditions which can be directly implemented in cosmological N-body codes. It allows the identification of caustics and the estimation of their annihilation radiation in fully general simulations of structure formation.

6 pages, 1 figure, Accepted for publication in MNRAS, minor edits

References in corpus (8)

• Building up the Stellar Halo of the Galaxy
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• The Clumpiness of Cold Dark Matter: Implications for the Annihilation Signal
• The fine-grained phase-space structure of Cold Dark Matter halos
• The geometry of phase mixing
• A cloudy Vlasov solution
• Gravitational cooling and density profile near caustics in collisionless dark matter haloes
• Particle Annihilation in Cold Dark Matter Micropancakes

Cited by in corpus (25)

• Dark matter and cosmic structure
• Galactic Searches for Dark Matter
• Tracing the Dark Matter Sheet in Phase Space
• Large-scale dark matter simulations
• The Warm DM halo mass function below the cut-off scale
• ORIGAMI: Delineating Halos using Phase-Space Folds
• Streams and caustics: the fine-grained structure of LCDM haloes
• An adaptively refined phase-space element method for cosmological simulations and collisionless dynamics
• Direct detection of self-interacting dark matter
• Phase-space structures II: Hierarchical Structure Finder
• Extragalactic gamma-ray background radiation from dark matter annihilation
• Caustics in growing Cold Dark Matter Haloes
• Origami constraints on the initial-conditions arrangement of dark-matter caustics and streams
• Simulating the Complexity of the Dark Matter Sheet I: Numerical Algorithms
• The phase-space structure of nearby dark matter as constrained by the SDSS
• The median density of the Universe
• Dark matter halo's and self similarity
• The cosmic web connection to the dark matter halo distribution through gravity
• Identifying Dark Matter Haloes by the Caustic Boundary
• Dark Matter Caustics in Galaxy Clusters
• Caustics, cold flows, and annual modulation
• Zeldovich pancakes at redshift zero: the equilibration state and phase space properties
• Collisionless Dynamics and the Cosmic Web
• Shaping non-reciprocal caustic spin-wave beams
• Simulating the complexity of the dark matter sheet II: halo and subhalo mass functions for non-cold dark matter models