A lower bound on primordial power spectrum from halo substructure
Shin'ichiro Ando, Nagisa Hiroshima, Koji Ishiwata, Tomo Takahashi
astro-ph.CO, astro-ph.GA, hep-ph
Submitted: 2026-07-23
Comments: 11 pages, 11 figures
Code: https://github.com/shinichiroando/sashimi-c
License: http://creativecommons.org/licenses/by/4.0/
The gist: We investigate how the primordial curvature perturbation of a certain wavelength scale affects the halo and subhalo structure.
Terminology
Abstract
We investigate how the primordial curvature perturbation of a certain wavelength scale affects the halo and subhalo structure. Primordial power spectrum considered in this paper features a nearly scale-invariant form with a cutoff at the wavenumber k = O(1) Mpc-1 and an additional log-normal bump at smaller scales. We compute the host halo evolution, as well as the subhalo mass function. To be consistent with the observations of stellar streams and gravitational lensing data, the amplitude of the bump that is typically the same or larger than 10-9 of the primordial curvature perturbation should be present at the wavenumbers of 10 - 30 Mpc-1.
Sources
- Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1
- Detection of lensing substructure using ALMA observations of the dusty galaxy SDP.81
- Evidence of a population of dark subhalos from Gaia and Pan-STARRS observations of the GD-1 stream
- Novel constraints on the particle nature of dark matter from stellar streams
- Modeling evolution of dark matter substructure and annihilation boost
- Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
- Statistics of Dark Matter Substructure: I. Model and Universal Fitting Functions
- The dearth of halo dwarf galaxies: is there power on short scales?
- Inflation and the dwarf galaxy problem
- Double inflation via non-minimally coupled spectator
- Effects of thermal inflation on small scale density perturbations
- Modeling Cosmological Perturbations of Thermal Inflation
- Structure Formation with Two Periods of Inflation: Beyond PLaIn $\Lambda$CDM
- Probing the inflaton: Small-scale power spectrum constraints from measurements of the CMB energy spectrum
- Improved constraints on the primordial power spectrum at small scales from ultracompact minihalos
- Steepest growth of the power spectrum and primordial black holes
- Constraining the primordial curvature perturbation using dark matter substructure
- Semi-analytical frameworks for subhalos from the smallest to the largest scale
- Planck 2018 results. VI. Cosmological parameters
- Halo Mass Function and the Free Streaming Scale
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