How an era of kination impacts substructure and the dark matter annihilation rate

Abstract

An era of kination occurs when the Universe's energy density is dominated by a fast-rolling scalar field. Dark matter that is thermally produced during an era of kination requires larger-than-canonical annihilation cross sections to generate the observed dark matter relic abundance. Furthermore, dark matter density perturbations that enter the horizon during an era of kination grow linearly with the scale factor prior to radiation domination. We show how the resulting enhancement to the small-scale matter power spectrum increases the microhalo abundance and boosts the dark matter annihilation rate. We then use gamma-ray observations to constrain thermal dark matter production during kination. The annihilation boost factor depends on the minimum halo mass, which is determined by the small-scale cutoff in the matter power spectrum. Therefore, observational limits on the dark matter annihilation rate imply a minimum cutoff scale for a given dark matter particle mass and kination scenario. For dark matter that was once in thermal equilibrium with the Standard Model, this constraint establishes a maximum allowed kinetic decoupling temperature for the dark matter. This bound on the decoupling temperature implies that the growth of perturbations during kination cannot appreciably boost the dark matter annihilation rate if dark matter was once in thermal equilibrium with the Standard Model.

arXiv comment23 pages, 18 figures. References added; matches accepted version

References in corpus (94)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Baryonic Features in the Matter Transfer Function
• The Aquarius Project: the subhalos of galactic halos
• Freeze-In Production of FIMP Dark Matter
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• Small Scale Cosmological Perturbations: An Analytic Approach
• Cosmology with a Primordial Scaling Field
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Quintessential inflation
• MeV-scale Reheating Temperature and Thermalization of Neutrino Background
• What is the lowest possible reheating temperature?
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Cosmological Constraints on Late-time Entropy Production
• MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles
• Bounds on very low reheating scenarios after Planck
• Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
• The first WIMPy halos
• Deflationary Universe Scenario
• Probing the early universe with inflationary gravitational waves
• The halo mass function through the cosmic ages
• Thermal Relics in Hidden Sectors
• An accurate physical model for halo concentrations
• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• The Small-Scale Power Spectrum of Cold Dark Matter
• On the gravitational production of superheavy dark matter
• Stochastic Gravitational Wave Production After Inflation
• What mass are the smallest protohalos?
• The flattening of the concentration-mass relation towards low halo masses and its implications for the annihilation signal boost
• Electroweak Baryogenesis and the Expansion Rate of the Universe
• Effects of cold dark matter decoupling and pair annihilation on cosmological perturbations
• Cosmological Constraints on Bose-Einstein-Condensed Scalar Field Dark Matter
• The oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature
• Dark matter subhalos and the dwarf satellites of the Milky Way
• Dark Matter Halo Merger Histories Beyond Cold Dark Matter: I - Methods and Application to Warm Dark Matter
• The 21cm angular-power spectrum from the dark ages
• Limits on Dark Matter Annihilation Signals from the Fermi LAT 4-year Measurement of the Isotropic Gamma-Ray Background
• Reheating Effects in the Matter Power Spectrum and Implications for Substructure
• Thermal Dark Matter From A Highly Decoupled Sector
• PeV-Scale Dark Matter as a Thermal Relic of a Decoupled Sector
• Cosmic Archaeology with Gravitational Waves from Cosmic Strings
• SUSY Dark Matter and Quintessence
• Modeling Quintessential Inflation
• Pulsar Timing Probes of Primordial Black Holes and Subhalos
• When the Universe Expands Too Fast: Relentless Dark Matter
• Ability of LIGO and LISA to probe the equation of state of the early Universe
• Chilly Dark Sectors and Asymmetric Reheating
• Non-thermal Histories and Implications for Structure Formation
• Dark Matter Freeze-in Production in Fast-Expanding Universes
• The Dark Matter Annihilation Boost from Low-Temperature Reheating
• Gravitational Lensing Signatures of Axion Dark Matter Minihalos in Highly Magnified Stars
• The Curvaton Hypothesis and the eta-problem of Quintessential Inflation, with and without Branes
• Constraints on Decaying Dark Matter from the Isotropic Gamma-Ray Background
• Earth-mass haloes and the emergence of NFW density profiles
• Quintessential Kination and Cold Dark Matter Abundance
• Heating in Brane Inflation and Hidden Dark Matter
• Formation and internal structure of superdense dark matter clumps and ultracompact minihaloes
• Bose-Einstein-condensed scalar field dark matter and the gravitational wave background from inflation: new cosmological constraints and its detectability by LIGO
• Observability of Dark Matter Substructure with Pulsar Timing Correlations
• Ultra-cold WIMPs: relics of non-standard pre-BBN cosmologies
• Constraint on the Effective Number of Neutrino Species from the WMAP and SDSS LRG Power Spectra
• 3D simulations with boosted primordial power spectra and ultracompact minihalos
• Probing Small-Scale Power Spectra with Pulsar Timing Arrays
• Inner cusps of the first dark matter haloes: Formation and survival in a cosmological context
• Structure Formation during an early period of matter domination
• (Non-)thermal production of WIMPs during kination
• Superdense cosmological dark matter clumps
• The detectability of cosmological gravitational-wave backgrounds: a rule of thumb
• Inconsistency of an inflationary sector coupled only to Einstein gravity
• The Abundance and Structure of Subhaloes near the Free Streaming Scale and Their Impact on Indirect Dark Matter Searches
• Precision cosmology and the stiff-amplified gravitational-wave background from inflation: NANOGrav, Advanced LIGO-Virgo and the Hubble tension
• Predicting the density profiles of the first halos
• What sets the central structure of dark matter haloes?
• Annihilation Signatures of Hidden Sector Dark Matter Within Early-Forming Microhalos
• Growth of Dark Matter Perturbations during Kination
• New Constraints on Dark Matter Production during Kination
• Breaking a dark degeneracy: The gamma-ray signature of early matter domination
• Dark Matter Microhalos From Simplified Models
• Dynamical Evolution of Primordial Dark Matter Haloes through Mergers
• Connecting LHC, ILC, and Quintessence
• Bringing Isolated Dark Matter Out of Isolation: Late-time Reheating and Indirect Detection
• Catch-Me-If-You-Can: The Overshoot Problem and the Weak/Inflation Hierarchy
• Kinetic Decoupling and Small-Scale Structure in Effective Theories of Dark Matter
• Thermal Inflation and the Gravitational Wave Background
• Tidal evolution of dark matter annihilation rates in subhalos
• Cannibal domination and the matter power spectrum
• Quintessential Kination and Thermal Production of Gravitinos and Axinos
• Lensing constraints on ultradense dark matter halos
• Cannibalism's lingering imprint on the matter power spectrum
• Prompt cusp formation from the gravitational collapse of peaks in the initial cosmological density field
• Major mergers between dark matter haloes -- II. Profile and concentration changes
• Dark Matter Microhalos in the Solar Neighborhood: Pulsar Timing Signatures of Early Matter Domination
• Tracking Quintessence and Cold Dark Matter Candidates
• CDM Abundance in non-Standard Cosmologies

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• Prompt cusps and the dark matter annihilation signal
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• Signatures of Very Early Dark Energy in the Matter Power Spectrum
• The cusp-halo relation