Self-Interacting Dark Matter in Cosmology: accurate numerical implementation and observational constraints

Abstract

This paper presents a systematic and accurate treatment of the evolution of cosmological perturbations in self-interacting dark matter models, for particles which decoupled from the primordial plasma while relativistic. We provide a numerical implementation of the Boltzmann hierarchies developed in a previous paper [JCAP, 09 (2020) 041] in a publicly available Boltzmann code and show how it can be applied to realistic DM candidates such as sterile neutrinos either under resonant or non-resonant production mechanisms, and for different field mediators. At difference with traditional fluid approximations -- also known as a $c_{\mathrm{eff}}-c_{\mathrm{vis}}$ parametrizations -- our approach follows the evolution of phase-space perturbations under elastic DM interactions for a wide range of interaction models, including the effects of late kinetic decoupling. Finally, we analyze the imprints left by different self interacting models on linear structure formation, which can be constrained using Lyman-$\alpha$ forest and satellite counts. We find new lower bounds on the particle mass that are less restrictive than previous constraints.

48 pages, 15 figures, 2 tables. Numerical code available at https://github.com/yunis121/siwdm-class

References in corpus (19)

• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• High-resolution mass models of dwarf galaxies from LITTLE THINGS
• Is dark matter with long-range interactions a solution to all small-scale problems of ΛCDM cosmology?
• Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry
• How cold is cold dark matter? Small scales constraints from the flux power spectrum of the high-redshift Lyman-alpha forest
• Resonant Dark Forces and Small Scale Structure
• Discovery of a 3.5 keV line in the Galactic Center and a Critical Look at the Origin of the Line Across Astronomical Targets
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• Interacting neutrinos in cosmology: exact description and constraints
• Joint constraints on thermal relic dark matter from strong gravitational lensing, the Lyman-$\alpha$ forest, and Milky Way satellites
• The phase space density of fermionic dark matter haloes
• Boltzmann hierarchy for interacting neutrinos I: formalism
• Cannibalism hinders growth: Cannibal Dark Matter and the $S_8$ tension
• The Cosmological Evolution of Self-interacting Dark Matter
• ETHOS -- An Effective Theory of Structure Formation: Impact of Dark Acoustic Oscillations on Cosmic Dawn
• Galactic Center constraints on self-interacting sterile neutrinos from fermionic dark matter ("ino") models
• Reshaping our understanding on structure formation with the quantum nature of the dark matter

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• Fermionic Dark Matter: Physics, Astrophysics, and Cosmology
• Cannibal dark matter decoupled from standard model: cosmological constraints
• Dark matter self-interactions in the matter power spectrum
• COZMIC. III. Cosmological Zoom-in Simulations of Self-interacting Dark Matter with Suppressed Initial Conditions
• From oversimplified to overlooked: the case for exploring Rich Dark Sectors