Evolution of dark matter microhalos through stellar encounters

Abstract

In the cold dark matter scenario, the smallest dark matter halos may be earth mass or smaller. These microhalos would be the densest dark matter objects in the Universe, making their accurate characterization important for astrophysical dark matter detection efforts. Moreover, their properties are closely linked to the nature of dark matter and the physics of the early universe, making them valuable cosmological probes. Dark matter microhalos survive as subhalos within larger galactic halos, but due to their small size, they are susceptible to encounters with individual stars. We use a large number of $N$-body simulations to develop a framework that can predict the evolution of a microhalo's density profile due to stellar encounters. We find that there is a universal density profile for microhalos subjected to stellar encounters, and each encounter alters a microhalo's scale parameters in a way that is simply related to the energy the encounter injects. Our framework can rapidly and accurately characterize the impact of stellar encounters on whole ensembles of microhalos, making it a promising tool for understanding the populations of microhalos within galactic halos.

arXiv comment14 pages, 17 figures; minor revisions to match published version

References in corpus (95)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• The Dark Side of the Halo Occupation Distribution
• The Trans-Planckian Problem of Inflationary Cosmology
• The subhalo populations of LCDM dark haloes
• Dark Matter Halos within Clusters
• Earth-mass dark-matter haloes as the first structures in the early Universe
• The Structural Evolution of Substructure
• Features of heavy physics in the CMB power spectrum
• The Physics of Galaxy Clustering I: A Model for Subhalo Populations
• A universal model for halo concentrations
• The Mass-Concentration-Redshift Relation of Cold and Warm Dark Matter Halos
• Large Nongaussianity in Axion Inflation
• Gauge Field Production in Axion Inflation: Consequences for Monodromy, non-Gaussianity in the CMB, and Gravitational Waves at Interferometers
• Disruption of Dark Matter Substructure: Fact or Fiction?
• Dark Matter Substructure in Numerical Simulations: A Tale of Discreteness Noise, Runaway Instabilities, and Artificial Disruption
• Damping scales of neutralino cold dark matter
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• An accurate physical model for halo concentrations
• The impact of dark matter cusps and cores on the satellite galaxy population around spiral galaxies
• Probing Planckian physics: resonant production of particles during inflation and features in the primordial power spectrum
• The power spectrum of SUSY-CDM on sub-galactic scales
• Survival of Substructure within Dark Matter Haloes
• Supernatural Inflation: Inflation from Supersymmetry with No (Very) Small Parameters
• The flattening of the concentration-mass relation towards low halo masses and its implications for the annihilation signal boost
• The Dynamics of Sinking Satellites Around Disk Galaxies: A Poor Man's Alternative to High-Resolution Numerical Simulations
• Small-scale clumps in the galactic halo and dark matter annihilation
• Multiple inflation
• The Population of Dark Matter Subhaloes: Mass Functions and Average Mass Loss Rates
• The number and size of subhalo-induced gaps in stellar streams
• Reheating Effects in the Matter Power Spectrum and Implications for Substructure
• On the importance of heavy fields during inflation
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• Hierarchical Formation of Dark Matter Halos and the Free Streaming Scale
• Dark Matter Annihilation in Substructures Revised
• Flattening the Inflaton's Potential with Quantum Corrections II
• Astrometric Observation of MACHO Gravitational Microlensing
• Where will supersymmetric dark matter first be seen?
• The Substructure Hierarchy in Dark Matter Haloes
• The survival and disruption of CDM micro-haloes: implications for direct and indirect detection experiments
• Forensics of Subhalo-Stream Encounters: The Three Phases of Gap Growth
• Particle Production During Inflation: Observational Constraints and Signatures
• Density Profiles of CDM Microhalos and their Implications for Annihilation Boost Factors
• Non-Vacuum Initial States for Cosmological Perturbations of Quantum-Mechanical Origin
• Destruction of small-scale dark matter clumps in the hierarchical structures and galaxies
• Gamma-ray Signal from Earth-mass Dark Matter Microhalos
• Non-thermal Histories and Implications for Structure Formation
• The Dark Matter Annihilation Boost from Low-Temperature Reheating
• Remnants of dark matter clumps
• Modeling evolution of dark matter substructure and annihilation boost
• Earth-mass haloes and the emergence of NFW density profiles
• Density profiles of ultracompact minihalos: Implications for constraining the primordial power spectrum
• On Features and Nongaussianity from Inflationary Particle Production
• Small-scale clumps of dark matter
• Are ultracompact minihalos really ultracompact?
• Halometry from Astrometry
• Cosmic Microwave Background Observables of Small Field Models of Inflation
• Dissecting the Evolution of Dark Matter Subhaloes in the Bolshoi Simulation
• Effects of dynamical evolution on the distribution of substructures
• Impact of Dark Matter Microhalos on Signatures for Direct and Indirect Detection
• Running-mass models of inflation, and their observational constraints
• Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
• Probing Dark Matter Substructure with Pulsar Timing
• On mini-halo encounters with stars
• Boosting the annihilation boost: Tidal effects on dark matter subhalos and consistent luminosity modeling
• Prospects for Detecting Dark Matter Halo Substructure with Pulsar Timing
• Two-Body Relaxation in Cosmological Simulations
• Nonlinear evolution of dark matter subhalos and applications to warm dark matter
• Modeling dark matter subhalos in a constrained galaxy: Global mass and boosted annihilation profiles
• DASH: a library of dynamical subhalo evolution
• Structure Formation during an early period of matter domination
• Tidal Destruction of The First Dark Microhalos
• An Improved Model for the Dynamical Evolution of Dark Matter Subhaloes
• An Upper Limit to the Mass of Black Holes in the Halo of our Galaxy
• Search for Gamma-Ray Lines towards Galaxy Clusters with the Fermi-LAT
• Predicting the density profiles of the first halos
• What sets the central structure of dark matter haloes?
• Growth of Dark Matter Perturbations during Kination
• Fingerprints of the initial conditions on the density profiles of cold and warm dark matter haloes
• Concentration, Ellipsoidal Collapse, and the Densest Dark Matter haloes
• Dynamical Evolution of Primordial Dark Matter Haloes through Mergers
• Astrometric Microlensing by Local Dark Matter Subhalos
• The phase-space structure of tidally stripped halos
• Stellar Wakes from Dark Matter Subhalos
• Waterfall field in hybrid inflation and curvature perturbation
• Contribution of the hybrid inflation waterfall to the primordial curvature perturbation
• Analysis of galactic tides and stars on CDM microhalos
• Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
• Tidal evolution of dark matter annihilation rates in subhalos
• Gamma-ray evidences of the dark matter clumps
• Tidal Mass Loss from Collisionless Systems
• Fluctuations of the gravitational field generated by a random population of extended substructures
• Remnants of Galactic subhalos and their impact on indirect dark matter searches
• Gravitational Nanolensing from Subsolar Mass Dark Matter Halos
• Constraining dark matter sub-structure with the dynamics of astrophysical systems

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• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• Large-scale dark matter simulations
• Can tides disrupt cold dark matter subhaloes?
• The asymptotic tidal remnants of cold dark matter subhalos
• Dark Photon Stars: Formation and Role as Dark Matter Substructure
• Simulations of Axion Minihalos
• Imprints of the Early Universe on Axion Dark Matter Substructure
• Stellar Disruption of Axion Miniclusters in the Milky Way
• Breaking a dark degeneracy: The gamma-ray signature of early matter domination
• Mass loss in tidally stripped systems; the energy-based truncation method
• Cannibal domination and the matter power spectrum
• Cannibalism's lingering imprint on the matter power spectrum
• Dark Matter Microhalos in the Solar Neighborhood: Pulsar Timing Signatures of Early Matter Domination
• The effect of stellar encounters on the dark matter annihilation signal from prompt cusps
• Boosting small-scale structure via primordial black holes and implications for sub-GeV dark matter annihilation
• The Effects Of Relativistic Hidden Sector Particles on the Matter Power Spectrum
• Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• The Disruption of Dark Matter Minihalos by Successive Stellar Encounters
• Can prompt cusps of WIMP dark matter be detected as individual gamma-ray sources?
• Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced $s$- and $p$-wave $\gamma$-ray signals
• Collisional Dynamics of Stars and Dark Matter in Ultra-Faint Galaxies
• A Faster Growth of Perturbations in an Early Matter Dominated Epoch: Primordial Black Holes and Gravitational Waves
• A self-consistent wave description of axion miniclusters and their survival in the galaxy