Density profiles of ultracompact minihalos: Implications for constraining the primordial power spectrum

Abstract

Enhanced density fluctuations on small scales would lead to the formation of numerous dark matter minihalos, so limits on the minihalo abundance can place upper bounds on the small-scale primordial power spectrum. In particular, the ultracompact minihalo (UCMH), a dark matter structure hypothesized to possess a $\rho \propto r^{-9/4}$ density profile due to its formation at $z\ge 1000$, has been used to establish an upper bound on the primordial power spectrum at scales smaller than 2 Mpc. The extreme slope of this density profile amplifies the observational signals of UCMHs. However, we recently showed via N-body simulations that the $\rho \propto r^{-9/4}$ density profile does not develop in realistic formation scenarios, throwing UCMH-derived power spectrum constraints into question. Instead, minihalos develop shallower inner profiles with power-law indices between $-3/2$ and $-1$. In this paper, we expand on that result and discuss its implications. Using a model that is calibrated to simulation results and predicts halo structures in spiked power spectra based on their formation times, we calculate new upper bounds on the primordial power spectrum based on limits on the dark matter annihilation rate within the Galaxy. We find that despite assuming shallower profiles, this minihalo model actually yields stronger constraints than the previous UCMH picture owing to its inclusion of all minihalos instead of only the earliest-forming ones.

arXiv comment15 pages plus appendices; 22 figures. Expanded discussion of power spectrum constraints; matches published version

References in corpus (127)

• Planck 2015 results. XIII. Cosmological parameters
• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• The cosmological simulation code GADGET-2
• Particle Dark Matter: Evidence, Candidates and Constraints
• Supersymmetric Dark Matter
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Profiles of dark haloes: evolution, scatter, and environment
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• Fermi Large Area Telescope Second Source Catalog
• Cold collapse and the core catastrophe
• Concentrations of Dark Halos from their Assembly Histories
• Simulations of X-ray Clusters
• The Inner Structure of LambdaCDM Halos I: A Numerical Convergence Study
• MultiDark simulations: the story of dark matter halo concentrations and density profiles
• Cold dark matter haloes in the Planck era: evolution of structural parameters for Einasto and NFW profiles
• Halos and galaxies in the standard cosmological model: results from the Bolshoi simulation
• Small Scale Cosmological Perturbations: An Analytic Approach
• Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology
• Non-Baryonic Dark Matter - Observational Evidence and Detection Methods
• The Trans-Planckian Problem of Inflationary Cosmology
• The statistics of LCDM Halo Concentrations
• Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
• Halo concentrations in the standard LCDM cosmology
• The linear power spectrum of observed source number counts
• The redshift dependence of the structure of massive LCDM halos
• Accurate universal models for the mass accretion histories and concentrations of dark matter halos
• The Power Spectrum Dependence of Dark Matter Halo Concentrations
• The properties of warm dark matter haloes
• Earth-mass dark-matter haloes as the first structures in the early Universe
• Dark matter and cosmic structure
• Features of heavy physics in the CMB power spectrum
• A universal model for halo concentrations
• 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?
• Probing the inflaton: Small-scale power spectrum constraints from measurements of the CMB energy spectrum
• The radial velocity dispersion profile of the Galactic halo: Constraining the density profile of the dark halo of the Milky Way
• The density profile of equilibrium and non-equilibrium dark matter halos
• The Mass-Concentration-Redshift Relation of Cold Dark Matter Halos
• The accretion history of dark matter halos III: A physical model for the concentration-mass relation
• Mass and Redshift Dependence of Dark Halo Structure
• Probing Planckian physics: resonant production of particles during inflation and features in the primordial power spectrum
• Dark Matter Halo Profiles of Massive Clusters: Theory vs. Observations
• Improved constraints on the primordial power spectrum at small scales from ultracompact minihalos
• Supernatural Inflation: Inflation from Supersymmetry with No (Very) Small Parameters
• The Mass Profile and Accretion History of Cold Dark Matter Halos
• Multiple inflation
• Halo Mass Function and the Free Streaming Scale
• Generalised constraints on the curvature perturbation from primordial black holes
• The Redshift Evolution of LCDM Halo Parameters: Concentration, Spin, and Shape
• Towards optimal softening in 3D N-body codes: I. Minimizing the force error
• Dark Matter Halo Merger Histories Beyond Cold Dark Matter: I - Methods and Application to Warm Dark Matter
• Constraints on Warm Dark Matter from Cosmological Reionization
• The 21cm angular-power spectrum from the dark ages
• A New Probe of Dark Matter and High-Energy Universe Using Microlensing
• The Warm DM halo mass function below the cut-off scale
• Reheating Effects in the Matter Power Spectrum and Implications for Substructure
• On the importance of heavy fields during inflation
• Minimally Parametric Power Spectrum Reconstruction from the Lyman-alpha Forest
• New Universal Local Feature in the Inflationary Perturbation Spectrum
• Merger Rates of Dark-Matter Haloes
• The dependence on environment of Cold Dark Matter Halo properties
• Hierarchical Formation of Dark Matter Halos and the Free Streaming Scale
• Flattening the Inflaton's Potential with Quantum Corrections II
• The Atacama Cosmology Telescope: a measurement of the primordial power spectrum
• The survival and disruption of CDM micro-haloes: implications for direct and indirect detection experiments
• Particle Production During Inflation: Observational Constraints and Signatures
• The Dynamical State and Mass-Concentration Relation of Galaxy Clusters
• Density Profiles of CDM Microhalos and their Implications for Annihilation Boost Factors
• Gamma rays from ultracompact primordial dark matter minihalos
• Non-Vacuum Initial States for Cosmological Perturbations of Quantum-Mechanical Origin
• Fundamental Discreteness Limitations of Cosmological N-Body Clustering Simulations
• Formation times, mass growth histories and concentrations of dark matter haloes
• 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
• Optimal softening for force calculations in collisionless N-body simulations
• The Dark Matter Annihilation Boost from Low-Temperature Reheating
• Remnants of dark matter clumps
• Earth-mass haloes and the emergence of NFW density profiles
• On Features and Nongaussianity from Inflationary Particle Production
• Are ultracompact minihalos really ultracompact?
• A new probe of the small-scale primordial power spectrum: astrometric microlensing by ultracompact minihalos
• Self-Consistent Theory of Halo Mergers
• Cosmic Microwave Background Observables of Small Field Models of Inflation
• Gamma-rays from ultracompact minihalos: potential constraints on the primordial curvature perturbation
• Formation and internal structure of superdense dark matter clumps and ultracompact minihaloes
• Impact of Dark Matter Microhalos on Signatures for Direct and Indirect Detection
• Running-mass models of inflation, and their observational constraints
• Investigating dark matter substructure with pulsar timing: I. Constraints on ultracompact minihalos
• On mini-halo encounters with stars
• Demonstrating Discreteness and Collision Error in Cosmological N-body Simulations of Dark Matter Gravitational Clustering
• 3D simulations with boosted primordial power spectra and ultracompact minihalos
• Two-Body Relaxation in Cosmological Simulations
• Structure Formation during an early period of matter domination
• Tidal Destruction of The First Dark Microhalos
• Number Counts and Non-Gaussianity
• Impact of Primordial Ultracompact Minihaloes on the Intergalactic Medium and First Structure Formation
• What sets the central structure of dark matter haloes?
• Growth of Dark Matter Perturbations during Kination
• Constraints on small-scale primordial power by annihilation signals from extragalactic dark matter minihalos
• Fingerprints of the initial conditions on the density profiles of cold and warm dark matter haloes
• Observational constraints on an inflation model with a running mass
• Ultracompact minihalos as probes of inflationary cosmology
• Dynamical Evolution of Primordial Dark Matter Haloes through Mergers
• Concentration, Ellipsoidal Collapse, and the Densest Dark Matter haloes
• Constraints on ultracompact minihalos from extragalactic γ-ray background
• Black holes and gravitational waves in string cosmology
• Waterfall field in hybrid inflation and curvature perturbation
• Analysis of galactic tides and stars on CDM microhalos
• Contribution of the hybrid inflation waterfall to the primordial curvature perturbation
• Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
• Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation
• Dark-ages Reionization & Galaxy Formation Simulation II: Spin and concentration parameters for dark matter haloes during the Epoch of Reionization
• New Constraints on Primordial Minihalo Abundance Using Cosmic Microwave Background Observations
• Investigating dark matter substructure with pulsar timing: II. Improved limits on small-scale cosmology
• The contribution of ultracompact dark matter minihalos to the isotropic radio background
• The Abundance of New Kind of Dark Matter Structures
• Hunting for dark halo substructure using submilliarcsecond-scale observations of macrolensed radio jets
• Primordial Black Hole as a Source of the Boost Factor
• Dark Matter Decay and the Abundance of Ultracompact Minihalos
• A new bound on the low reheating temperature with dark matter
• Heating of galactic gas by dark matter annihilation in ultracompact minihalos
• Constraints on the primordial power spectrum of small scales using the neutrino signals from the dark matter decay
• Tau neutrinos from ultracompact dark matter minihalos and constraints on the primordial curvature perturbations

Cited by in corpus (63)

• Steepest growth of the power spectrum and primordial black holes
• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• The Large-Misalignment Mechanism for the Formation of Compact Axion Structures: Signatures from the QCD Axion to Fuzzy Dark Matter
• Large-scale dark matter simulations
• Early Structure Formation in $\Lambda$PBH Cosmologies
• WIMPs and stellar-mass primordial black holes are incompatible
• Pulsar Timing Probes of Primordial Black Holes and Subhalos
• Gravitational microlensing by dark matter in extended structures
• Core-collapse, evaporation and tidal effects: the life story of a self-interacting dark matter subhalo
• Primordial Gravitational Wave Signals in Modified Cosmologies
• Imprints of the Early Universe on Axion Dark Matter Substructure
• The Abundance and Structure of Subhaloes near the Free Streaming Scale and Their Impact on Indirect Dark Matter Searches
• Predicting the density profiles of the first halos
• Constraining first-order phase transitions with curvature perturbations
• Annihilation Signatures of Hidden Sector Dark Matter Within Early-Forming Microhalos
• Breaking a dark degeneracy: The gamma-ray signature of early matter domination
• Dark Matter Microhalos From Simplified Models
• First Results on Dark Matter Substructure from Astrometric Weak Lensing
• Phase-space structure of protohalos: Vlasov versus Particle-Mesh
• Tidal evolution of dark matter annihilation rates in subhalos
• Evolution of dark matter microhalos through stellar encounters
• Lensing constraints on ultradense dark matter halos
• Prompt cusps and the dark matter annihilation signal
• Constraining Mixed Dark-Matter Scenarios of WIMPs and Primordial Black Holes from CMB and 21-cm observations
• The Power of Halometry
• Prompt cusp formation from the gravitational collapse of peaks in the initial cosmological density field
• Dark Matter Microhalos in the Solar Neighborhood: Pulsar Timing Signatures of Early Matter Domination
• Smooth vs instant inflationary transitions: steepest growth re-examined and primordial black holes
• Constraining the primordial curvature perturbation using dark matter substructure
• Structure formation with primordial black holes: collisional dynamics, binaries, and gravitational waves
• The 21-cm signals from ultracompact minihalos as a probe of primordial small-scale fluctuations
• Primordial black hole dark matter in the presence of p-wave WIMP annihilation
• 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
• Massive prompt cusps: A new signature of warm dark matter
• Constraints on small-scale primordial density fluctuation from cosmic microwave background through dark matter annihilation
• Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background
• Minihalos as probes of the inflationary spectrum: accurate boost factor calculation and new CMB constraints
• CMB and 21cm bounds on early structure formation boosted by primordial black hole entropy fluctuations
• Simulations of Gravitational Heating Due to Early Matter Domination
• Constraints on ultracompact minihalos from the extragalactic gamma-ray background observation
• Radio bounds on the mixed dark matter scenarios of primordial black holes and WIMPs
• Gravitational Lensing in More Realistic Dark Matter Halo Models
• Axionlike Origin of the Primordial Density Perturbation
• Semi-analytical frameworks for subhalos from the smallest to the largest scale
• Can prompt cusps of WIMP dark matter be detected as individual gamma-ray sources?
• Cosmological contribution from population III stars in ultracompact minihalos
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• The gravitational force field of proto-pancakes
• Molecular ionization rates and ultracompact dark matter minihalos
• Structure Formation with Warm White Noise: Effects of Finite Number Density and Velocity Dispersion in Particle and Wave Dark Matter
• Enhanced Small-Scale Structure in the Cosmic Dark Ages
• Limits on Early Matter Domination from the Isotropic Gamma-Ray Background
• The cusp-halo relation
• Ultradense Dark Matter Halos with Poisson Noise from Stellar-Mass Primordial Black Holes
• Updated constraints on the primordial power spectrum at sub-Mpc scales
• How large are curvature perturbations from slow first-order phase transitions? A gauge-invariant analysis
• Gamma Rays from UltraCompact Minihaloes: Effects on the Earth's Atmosphere and Links to Mass Extinction Events
• Insights for Early Dark Energy with Big Bang Nucleosynthesis
• A Faster Growth of Perturbations in an Early Matter Dominated Epoch: Primordial Black Holes and Gravitational Waves
• Constraints on Axion Dark Matter by Spin-Dependent Macroscopic Force
• A dynamics-based density profile for dark haloes. I. Algorithm and basic results
• Post-collapse Lagrangian perturbation theory in three dimensions