Cosmological Zoom-In Simulations of Milky Way Host Mass Dark Matter Halos with a Blue-Tilted Primordial Power Spectrum

Abstract

Recent observations from the James Webb Space Telescope revealed a surprisingly large number of galaxies at high redshift, challenging the standard Lambda Cold Dark Matter cosmology with a power-law primordial power spectrum. Previous studies alleviated this tension with a blue tilted primordial power spectrum ($P(k)\propto k^{m_s}$ with $m_s>1$ at small scales $>1{\mathrm{cMpc}}^{-1}$). In this study, we examine whether the blue tilted model can boost dark matter substructures especially at low redshift, thereby addressing other potential challenges to the standard cosmology. First, substructures in the standard cosmological model may not be sufficient to explain the anomalous flux ratio problem observed in strong gravitational lensing. Second, the number of observed nearby satellite galaxies could be higher than the theoretical predictions of the standard cosmology, after completeness correction and tidal stripping by baryonic disks. To study the impact of a blue tilted primordial power spectrum on substructures, we perform high-resolution cosmological zoom-in dark matter-only simulations of Milky Way host mass halos, evolving to redshift $z=0$. At $z=0$, we find that the blue-tilted subhalo mass functions can be enhanced by more than a factor of two for subhalo masses $M_{\mathrm{sub}}\lesssim 10^{10}M\odot$, whereas the subhalo $V_{\max }$ functions can be enhanced by a factor of four for maximum circular velocities $V_{\max }\lesssim 30km/s$. The blue-tilted scaled cumulative substructure fraction can be an order of magnitude higher at $\sim$10\% of the virial radius. The blue-tilted subhalos also have higher central densities, since the blue-tilted subhalos reach the same $V_{\max }$ at a smaller distance $R_{\max }$ from the center. We have also verified these findings with higher-resolution simulations.

arXiv comment24 pages, 18 figures; based on the version published in PRD, with added code and data availability statements

References in corpus (74)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The NumPy array: a structure for efficient numerical computation
• A Universal Density Profile from Hierarchical Clustering
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• Planck 2018 results. X. Constraints on inflation
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• Baryonic Features in the Matter Transfer Function
• The James Webb Space Telescope
• Hierarchical Galaxy Formation
• The Aquarius Project: the subhalos of galactic halos
• Particle Physics Models of Inflation and the Cosmological Density Perturbation
• GADGET: A code for collisionless and gasdynamical cosmological simulations
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• FIRE-2 Simulations: Physics versus Numerics in Galaxy Formation
• The Inner Structure of LambdaCDM Halos I: A Numerical Convergence Study
• The Dark Side of the Halo Occupation Distribution
• Multi-scale initial conditions for cosmological simulations
• Observational and Theoretical Constraints on Singular Dark Matter Halos
• Cosmological Simulations with Self-Interacting Dark Matter I: Constant Density Cores and Substructure
• The Trans-Planckian Problem of Inflationary Cosmology
• The Cold Dark Matter Density Perturbation
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear
• Reconciling dwarf galaxies with LCDM cosmology: Simulating a realistic population of satellites around a Milky Way-mass galaxy
• Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data
• A population of red candidate massive galaxies ~600 Myr after the Big Bang
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey
• Evidence for substructure in lens galaxies?
• The Origin of the Galaxy Mass-Metallicity Relation and Implications for Galactic Outflows
• The dependence of dark matter profiles on the stellar to halo mass ratio: a prediction for cusps vs cores
• The properties of warm dark matter haloes
• Dark Matter Scaling Relations
• COBE, Gravitational Waves, Inflation and Extended Inflation
• The halo mass function from the dark ages through the present day
• The Impact of Baryonic Physics on the Structure of Dark Matter Halos: the View from the FIRE Cosmological Simulations
• Galacticus: A Semi-Analytic Model of Galaxy Formation
• A universal model for halo concentrations
• Not so lumpy after all: modeling the depletion of dark matter subhalos by Milky Way-like galaxies
• Stress Testing $\Lambda$CDM with High-redshift Galaxy Candidates
• NIHAO IV: Core creation and destruction in dark matter density profiles across cosmic time
• The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys
• Halo and Subhalo Demographics with Planck Cosmological Parameters: Bolshoi-Planck and MultiDark-Planck Simulations
• A Very Fast and Momentum-Conserving Tree Code
• The upper bound on the lowest mass halo
• A dark matter profile to model diverse feedback-induced core sizes of $\Lambda$CDM haloes
• Extreme Value Statistics of the Halo and Stellar Mass Distributions at High Redshift: are JWST Results in Tension with ΛCDM?
• Public data release of the FIRE-2 cosmological zoom-in simulations of galaxy formation
• HBT+: an improved code for finding subhalos and building merger trees in cosmological simulations
• How well can cold-dark-matter substructures account for the observed radio flux-ratio anomalies?
• Effects of Dark Matter Substructures on Gravitational Lensing: Results from the Aquarius Simulations
• Statistics of mass substructure from strong gravitational lensing: quantifying the mass fraction and mass function
• Matter power spectrum: from Ly$\alpha$ forest to CMB scales
• SWIFT: A modern highly-parallel gravity and smoothed particle hydrodynamics solver for astrophysical and cosmological applications
• The Copernicus Complexio: a high-resolution view of the small-scale Universe
• Hunting for Galaxies and Halos in simulations with VELOCIraptor
• Running-mass models of inflation, and their observational constraints
• SHARP - II. Mass structure in strong lenses is not necessarily dark matter substructure: A flux ratio anomaly from an edge-on disc
• How low does it go? Too few Galactic satellites with standard reionization quenching
• Strong lensing signatures of luminous structure and substructure in early-type galaxies
• GRUMPY: a simple framework for realistic forward-modelling of dwarf galaxies
• The effect of low mass substructures on the Cusp lensing relation
• Subhalo statistics of galactic halos: beyond the resolution limit
• Waterfall field in hybrid inflation and curvature perturbation
• Early structure formation from primordial density fluctuations with a blue-tilted power spectrum
• A Parametric Model for Self-Interacting Dark Matter Halos
• The optimal gravitational softening length for cosmological N-body simulations
• Baryonic effects on the detectability of annihilation radiation from dark matter subhaloes around the Milky Way
• Excess of high-$z$ galaxies as a test for bumpy power spectrum of density perturbations
• A too-many dwarf galaxy satellites problem in the M83 group

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