Cosmological Simulations with Self-Interacting Dark Matter II: Halo Shapes vs. Observations

Abstract

If dark matter has a large self-interaction scattering cross section, then interactions among dark-matter particles will drive galaxy and cluster halos to become spherical in their centers. Work in the past has used this effect to rule out velocity-independent, elastic cross sections larger than sigma/m ~ 0.02 cm^2/g based on comparisons to the shapes of galaxy cluster lensing potentials and X-ray isophotes. In this paper, we use cosmological simulations to show that these constraints were off by more than an order of magnitude because (a) they did not properly account for the fact that the observed ellipticity gets contributions from the triaxial mass distribution outside the core set by scatterings, (b) the scatter in axis ratios is large and (c) the core region retains more of its triaxial nature than estimated before. Including these effects properly shows that the same observations now allow dark matter self-interaction cross sections at least as large as sigma/m = 0.1 cm^2/g. We show that constraints on self-interacting dark matter from strong-lensing clusters are likely to improve significantly in the near future, but possibly more via central densities and core sizes than halo shapes.

arXiv comment17 pages, 11 figures

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• The feasibility of constraining DM interactions with high-redshift observations by JWST
• Probing Dark Star Parameters Through $f$-Mode Gravitational Wave Signals
• Sensitivity of Halo Shape Measurements
• The shape of dark matter haloes: results from weak lensing in the Ultraviolet Near-Infrared Optical Northern Survey (UNIONS)
• A Novel Scheme for Dark Matter Annihilation Feedback in Cosmological Simulations
• Understanding Dwarf Galaxies in order to Understand Dark Matter
• Observational Probes of the Neutron Star Equation of State with Hyperons, Bosonic Dark Matter, and Quark Matter
• BUFFALO Wild Wings: A High Precision Free-Form Lens Model of MACSJ0416 with Constraints on Dark Matter from Substructure and Highly Magnified Arcs
• Testing the Collisionless Nature of Dark Matter with the Radial Acceleration Relation in Galaxy Clusters
• A MARVEL-ous study of how well galaxy shapes reflect Dark Matter halo shapes in Cold Dark Matter Simulations
• Trial by FIRE: Probing the dark matter density profile of dwarf galaxies with GraphNPE
• Probing Self-Interacting Dark Matter via Gravitational-Wave Background from Eccentric Supermassive Black Hole Mergers
• Super-Resonant Dark Matter
• The imprint of dark matter on the Galactic acceleration field
• Central densities of dark matter halos in FIRE-2 simulations of low-mass galaxies with cold dark matter and self-interacting dark matter
• Hidden sectors and a multi-temperature universe
• Shape and connectivity of groups and clusters: Impact of dynamical state and accretion history
• Optical dispersion of composite particles consisting of millicharged constituents
• Glow in the Dark Matter: Observing galactic halos with scattered light
• F-mode Oscillations of Neutron Stars with Dark Matter from Neutron Decay: Implications for Gravitational-Wave Detectability
• Constraining Dwarf Spheroidal Dark Matter Halos With The Galactic Center Excess
• A Vertically Orientated Dark Matter Halo Marks a Flip of the Galactic Disk
• Realization of Sneutrino Self-interacting Dark Matter in the Focus Point Supersymmetry
• Self-interacting dark matter constraints in a thick dark disk scenario
• Composite self-interacting dark matter and Higgs
• Triaxiality in galaxy clusters: Mass versus Potential reconstructions
• The decaying and scattering properties of the $d^{\ast }$(2380) hexaquark Bose Einstein Condensate dark matter
• Probing the shape and internal structure of dark matter halos with the halo-shear-shear three-point correlation function
• MeV scale model of SIMP dark matter, neutrino mass and leptogenesis
• Constraints on Long-Ranged Interactions Between Dark Matter and the Standard Model
• Thermal evolution of dark matter and gravitational-wave production in the early universe from a symplectic glueball model
• Core Collapse Beyond the Fluid Approximation: The Late Evolution of Self-Interacting Dark Matter Halos
• DARKSKIES: A suite of super-sampled zoom-in simulations of galaxy clusters with self-interacting dark matter
• Testing extensions to LCDM on small scales with forthcoming cosmic shear surveys
• Self-interacting dark matter as a solution to the problems in small-scale structures
• Core collapse in resonant self-interacting dark matter across two decades in halo mass
• Cosmological Dark Matter in a Conformal Model
• Ellipticities of Galaxy Cluster Halos from Halo-Shear-Shear Correlations
• Gravitational and distributed heating effects of a cD galaxy on the hydrodynamical structure of its host cluster
• Investigating the collinear splitting effects of boosted dark matter at neutrino detectors
• Co-interacting dark matter and conformally coupled light scalars
• A Robust Measure of Dark Matter Halo Ellipticities
• The probability distribution of 3-D shapes of galaxy clusters from 2-D X-ray images
• Distinguishing thermal histories of dark matter from structure formation
• The AIDA-TNG project: 3D halo shapes
• Constraints on dark matter models from the stellar cores observed in ultra-faint dwarf galaxies: Self-interacting dark matter
• An Interpretable AI Framework to Disentangle Self-Interacting and Cold Dark Matter in Galaxy Clusters: The CKAN Approach
• Decoupled Sectors and Wolf-Rayet Galaxies
• Dark matter haloes in the multicomponent model. III. From dwarfs to galaxy clusters
• A Random Walk Model for Halo Triaxiality
• Cosmological simulations with rare and frequent dark matter self-interactions
• Unequal-mass mergers of dark matter haloes with rare and frequent self-interactions
• Strongly-interacting massive particle and dark photon in the era of intensity frontier
• Super Interacting Dark Sector: An Improvement on Self-Interacting Dark Matter via Scaling Relations of Galaxy Clusters
• Merging Galaxy Clusters and the Search for New Physics of Dark Matter: A Review
• The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters
• Measuring the Dark Matter Self-Interaction Cross-Section with Deep Compact Clustering for Robust Machine Learning Inference
• AMICO galaxy clusters in KiDS-1000: Splashback radius from weak lensing and cluster-galaxy correlation function
• A comparative lattice analysis of $SU(2)$ dark gluebal
• Producing and constraining self-interacting hidden sector dark matter
• Structure Formation with Dark Magnetohydrodynamics
• Constraining the population of dark matter halo shapes using hierarchical inference with extragalactic stellar streams