Universal clustering of dark matter in phase space

Abstract

We have recently introduced a novel statistical measure of dark matter clustering in phase space, the particle phase space average density ($P^{2}SAD$). In a two-paper series, we studied the structure of $P^{2}SAD$ in the Milky-Way-size Aquarius haloes, constructed a physically motivated model to describe it, and illustrated its potential as a powerful tool to predict signals sensitive to the nanostructure of dark matter haloes. In this letter, we report a remarkable universality of the clustering of dark matter in phase space as measured by $P^{2}SAD$ within the subhaloes of host haloes across different environments covering a range from dwarf-size to cluster-size haloes ($10^{10}-10^{15}$ M${}_{\odot }$). Simulations show that the universality of $P^{2}SAD$ holds for more than 7 orders of magnitude, over a 2D phase space, covering over 3 orders of magnitude in distance/velocity, with a simple functional form that can be described by our model. Invoking the universality of $P^{2}SAD$, we can accurately predict the non-linear power spectrum of dark matter at small scales all the way down to the decoupling mass limit of cold dark matter particles. As an application, we compute the subhalo boost to the annihilation of dark matter in a wide range of host halo masses.

7 pages, 5 figures, version published in MNRAS

References in corpus (5)

• Dwarf galaxies in CDM and SIDM with baryons: observational probes of the nature of dark matter
• How well can cold-dark-matter substructures account for the observed radio flux-ratio anomalies?
• The statistics of the subhalo abundance of dark matter haloes
• Boosting the annihilation boost: Tidal effects on dark matter subhalos and consistent luminosity modeling
• Concentration, Ellipsoidal Collapse, and the Densest Dark Matter haloes

Cited by in corpus (16)

• Characterization of subhalo structural properties and implications for dark matter annihilation signals
• The Darkest Hour Before Dawn: Contributions to Cosmic Reionization from Dark Matter Annihilation and Decay
• Modeling evolution of dark matter substructure and annihilation boost
• Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
• The 21 cm signal and the interplay between dark matter annihilations and astrophysical processes
• The angular power spectrum of the diffuse gamma-ray emission as measured by the Fermi Large Area Telescope and constraints on its Dark Matter interpretation
• Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
• Concentration, Ellipsoidal Collapse, and the Densest Dark Matter haloes
• Prompt cusps and the dark matter annihilation signal
• Pushing down the low-mass halo concentration frontier with the Lomonosov cosmological simulations
• The Effects of Dark Matter Annihilation on Cosmic Reionization
• Cosmological boost factor for dark matter annihilation at redshifts of $z=10$-$100$ using the power spectrum approach
• The viability of low-mass subhaloes as targets for gamma-ray dark matter searches
• Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array
• Dark Matter and Fundamental Physics Searches with IACTs
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos