First Simulations of Axion Minicluster Halos

Abstract

We study the gravitational collapse of axion dark matter fluctuations in the post-inflationary scenario, so-called axion miniclusters, with N-body simulations. Largely confirming theoretical expectations, overdensities begin to collapse in the radiation-dominated epoch and form an early distribution of miniclusters with masses up to $10^{-12}{M}_{\odot }$. After matter-radiation equality, ongoing mergers give rise to a steep power-law distribution of minicluster halo masses. The density profiles of well-resolved halos are NFW-like to good approximation. The fraction of axion dark matter in these bound structures is $\sim 0.75$ at redshift $z=100$.

8 pages, 6 figures, accepted by PRL

References in corpus (37)

• The Structure of Cold Dark Matter Halos
• The cosmological simulation code GADGET-2
• Populating a cluster of galaxies - I. Results at z=0
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• Substructures in hydrodynamical cluster simulations
• The Inner Structure of LambdaCDM Halos I: A Numerical Convergence Study
• Understanding the Core-Halo Relation of Quantum Wave Dark Matter, $\psi$DM, from 3D Simulations
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Dependence of the outer density profiles of halos on their mass accretion rate
• Axion Miniclusters and Bose Stars
• Substructures in Cold Dark Matter Haloes
• Gravitational Bose-Einstein condensation in the kinetic regime
• Axions from Strings: the Attractive Solution
• Early-Universe Simulations of the Cosmological Axion
• Formation and structure of ultralight bosonic dark matter halos
• Early seeds of axion miniclusters
• The dark-matter axion mass
• Large-amplitude isothermal fluctuations and high-density dark-matter clumps
• Formation and mass growth of axion stars in axion miniclusters
• Structure Formation and Microlensing with Axion Miniclusters
• Axion dark matter: strings and their cores
• Fast Radio Bursts and Axion Miniclusters
• Astrophysical Effects of Scalar Dark Matter Miniclusters
• Femtolensing and Picolensing by Axion Miniclusters
• Long-term dynamics of cosmological axion strings
• Axion Cosmology with Early Matter Domination
• Axion minicluster power spectrum and mass function
• How to simulate global cosmic strings with large string tension
• Axion astronomy with microwave cavity experiments
• Axion Miniclusters in Modified Cosmological Histories
• Tidal streams from axion miniclusters and direct axion searches
• Directional axion detection
• 3D simulations with boosted primordial power spectra and ultracompact minihalos
• Destruction of axion miniclusters in the Galaxy
• Axion String Dynamics I: 2+1D
• The optimal gravitational softening length for cosmological N-body simulations
• May axion clusters be sources of fast radio bursts?

Cited by in corpus (50)

• Large-scale dark matter simulations
• The art of simulating the early Universe -- Part I
• Axion Quasiparticles for Axion Dark Matter Detection
• Dark Photon Stars: Formation and Role as Dark Matter Substructure
• Simulations of Axion Minihalos
• Gravitational waves from dark matter isocurvature
• Fast radio bursts from axion stars moving through pulsar magnetospheres
• Instability of rotating Bose stars
• Axion-photon conversion in strongly magnetised plasmas
• Probing Small-Scale Power Spectra with Pulsar Timing Arrays
• Transient Radio Signatures from Neutron Star Encounters with QCD Axion Miniclusters
• ALP Dark Matter in a Primordial Black Hole Dominated Universe
• Spectrum of global string networks and the axion dark matter mass
• Stellar Disruption of Axion Miniclusters in the Milky Way
• Simulations of axion-like particles in the post-inflationary scenario
• Structure of Axion Miniclusters
• Deep zoom-in simulation of a fuzzy dark matter galactic halo
• Looking for MACHOs in the Spectra of Fast Radio Bursts
• Dark Matter Microhalos From Simplified Models
• Axion Miniclusters Made Easy
• Axion minivoids and implications for direct detection
• Bayesian Forecasts for Dark Matter Substructure Searches with Mock Pulsar Timing Data
• Radio signatures from encounters between Neutron Stars and QCD-Axion Minihalos around Primordial Black Holes
• ALP Dark Matter Mini-Clusters from Kinetic Fragmentation
• Probing Relativistic Axions from Transient Astrophysical Sources
• Transient Radio Lines from Axion Miniclusters and Axion Stars
• Detecting Dark Matter Substructures on Small Scales with Fast Radio Bursts
• Resonant Conversion of Dark Matter Oscillons in Pulsar Magnetospheres
• Post-inflationary axions: a minimal target for axion haloscopes
• ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures
• Post-inflationary axion isocurvature perturbations facing CMB and large-scale structure
• QCD Axion Kinetic Misalignment without Prejudice
• Enhanced Early Galaxy Formation in JWST from Axion Dark Matter?
• Axion minicluster streams in the solar neighbourhood
• Diluted Axion Star Collisions with Neutron Stars
• New scenario of QCD axion clump formation I: Linear analysis
• New Constraints on Dark Matter and Cosmic Neutrino Profiles through Gravity
• Stimulated decay of collapsing axion stars and fast radio bursts
• Axion star condensation around primordial black holes and microlensing limits
• Present and future of CosmoLattice
• Time-domain properties of electromagnetic signals in a dynamical axion background
• Can Planet 9 be an Axion Star?
• Novel standard candle: Collapsing axion stars
• Astrophysical Searches and Constraints on Ultralight Bosonic Dark Matter
• Digging into Axion Physics with (Baby)IAXO
• On the Galactic radio signal from stimulated decay of axion dark matter
• Detecting dilute axion stars constrained by fast radio bursts in the Solar System via stimulated decay
• Evidence for axion miniclusters with an increased central density
• Probing Dark Matter Clumps, Strings and Domain Walls with Gravitational Wave Detectors
• A self-consistent wave description of axion miniclusters and their survival in the galaxy