Probing Small-Scale Power Spectra with Pulsar Timing Arrays

Abstract

Models of Dark Matter (DM) can leave unique imprints on the Universe's small scale structure by boosting density perturbations on small scales. We study the capability of Pulsar Timing Arrays to search for, and constrain, subhalos from such models. The models of DM we consider are ordinary adiabatic perturbations in $\Lambda$CDM, QCD axion miniclusters, models with early matter domination, and vector DM produced during inflation. We show that $\Lambda$CDM, largely due to tidal stripping effects in the Milky Way, is out of reach for PTAs (as well as every other probe proposed to detect DM small scale structure). Axion miniclusters may be within reach, although this depends crucially on whether the axion relic density is dominated by the misalignment or string contribution. Models where there is matter domination with a reheat temperature below 1 GeV may be observed with future PTAs. Lastly, vector DM produced during inflation can be detected if it is lighter than $10^{-16}\mathrm{GeV}$. We also make publicly available a Python Monte Carlo tool for generating the PTA time delay signal from any model of DM substructure.

arXiv comment32 pages, 10 figures

References in corpus (35)

• The Structure of Cold Dark Matter Halos
• Large scale bias and the peak background split
• The Aquarius Project: the subhalos of galactic halos
• Detecting a stochastic background of gravitational radiation: Signal processing strategies and sensitivities
• Gravitational-wave sensitivity curves
• Vector Dark Matter from Inflationary Fluctuations
• Axion Miniclusters and Bose Stars
• Compound gravitational lensing as a probe of dark matter substructure within galaxy halos
• Disruption of Dark Matter Substructure: Fact or Fiction?
• Universal structure of dark matter haloes over a mass range of 20 orders of magnitude
• More Axions from Strings
• Expected properties of the first gravitational wave signal detected with pulsar timing arrays
• Early-Universe Simulations of the Cosmological Axion
• Improved constraints on the primordial power spectrum at small scales from ultracompact minihalos
• Early seeds of axion miniclusters
• LISA for Cosmologists: Calculating the Signal-to-Noise Ratio for Stochastic and Deterministic Sources
• Large-amplitude isothermal fluctuations and high-density dark-matter clumps
• Reheating Effects in the Matter Power Spectrum and Implications for Substructure
• Minimally Parametric Power Spectrum Reconstruction from the Lyman-alpha Forest
• Pulsar Timing Probes of Primordial Black Holes and Subhalos
• Astrophysical Effects of Scalar Dark Matter Miniclusters
• Non-thermal Histories and Implications for Structure Formation
• Gravitational Lensing Signatures of Axion Dark Matter Minihalos in Highly Magnified Stars
• Whispers from the dark side: Confronting light new physics with NANOGrav data
• First Simulations of Axion Minicluster Halos
• Halometry from Astrometry
• Analytical Approach to Subhaloes Population in Dark Matter Haloes
• Pulsar timing can constrain primordial black holes in the LIGO mass window
• Probing Dark Matter Substructure with Pulsar Timing
• Investigating dark matter substructure with pulsar timing: I. Constraints on ultracompact minihalos
• Observability of Dark Matter Substructure with Pulsar Timing Correlations
• Prospects for Detecting Dark Matter Halo Substructure with Pulsar Timing
• On the Power Spectrum of Dark Matter Substructure in Strong Gravitational Lenses
• Cold Dark Matter Substructures in Early-Type Galaxy Halos
• Axion Miniclusters Made Easy

Cited by in corpus (36)

• The NANOGrav 15-year Data Set: Search for Signals from New Physics
• Dark Photon Stars: Formation and Role as Dark Matter Substructure
• Simulations of Axion Minihalos
• Can we observe the QCD phase transition-generated gravitational waves through pulsar timing arrays?
• Inner cusps of the first dark matter haloes: Formation and survival in a cosmological context
• Dark Matter Microhalos From Simplified Models
• The Interplay between the Dark Matter Axion and Primordial Black Holes
• Primordial Black Holes from CDM Isocurvature Perturbations
• Dark Grand Unification in the Axiverse: Decaying Axion Dark Matter and Spontaneous Baryogenesis
• Bayesian Forecasts for Dark Matter Substructure Searches with Mock Pulsar Timing Data
• ALP Dark Matter Mini-Clusters from Kinetic Fragmentation
• Detecting Dark Matter Substructures on Small Scales with Fast Radio Bursts
• ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures
• Dark Matter Microhalos in the Solar Neighborhood: Pulsar Timing Signatures of Early Matter Domination
• Astrophysical Observations of a Dark Matter-Baryon Fifth Force
• Smooth vs instant inflationary transitions: steepest growth re-examined and primordial black holes
• Constraining the primordial curvature perturbation using dark matter substructure
• Dark Matter Minihalos from Primordial Magnetic Fields
• Astrometric Gravitational-Wave Detection via Stellar Interferometry
• The Effects Of Relativistic Hidden Sector Particles on the Matter Power Spectrum
• Dark Freeze-out Cogenesis
• Macroscopic Dark Matter Detection with Gravitational Wave Experiments
• The Effect of Multiple Cooling Channels on the Formation of Dark Compact Objects
• How an era of kination impacts substructure and the dark matter annihilation rate
• Simulations of Gravitational Heating Due to Early Matter Domination
• Semi-analytical frameworks for subhalos from the smallest to the largest scale
• Early Growth of Structure in Warm Wave Dark Matter
• Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
• The Disruption of Dark Matter Minihalos by Successive Stellar Encounters
• Detecting gravitational signatures of dark matter with atom gradiometers
• Primordial Black Holes and Second-order Gravitational Waves in Axion-like Hybrid Inflation
• Structure Formation with Warm White Noise: Effects of Finite Number Density and Velocity Dispersion in Particle and Wave Dark Matter
• Limits on Early Matter Domination from the Isotropic Gamma-Ray Background
• Constraining Fundamental Constant Variations from Ultralight Dark Matter with Pulsar Timing Arrays
• Physics beyond the Standard Model with the DSA-2000
• Dark Unification: a UV-complete Theory of Asymmetric Dark Matter