Matching JWST UV Luminosity Functions with Refined $\Lambda$CDM Halo Models

Abstract

The James Webb Space Telescope (JWST) has unveiled a population of unexpectedly massive and luminous galaxies at redshifts $z\gtrsim 7$, posing a significant challenge to the standard $\Lambda$CDM cosmological paradigm. In this work, we address the tension between early JWST observations of luminous high-redshift galaxies and predictions of the standard $\Lambda$CDM model by revisiting the physics of dark matter halo formation. Employing refined halo mass functions derived by Del Popolo \textit{et al.} (DP1 and DP2) that incorporate angular momentum, dynamical friction, and redshift-dependent collapse barriers, we demonstrate a significant enhancement in the abundance of massive halos at $z\gtrsim 7$ compared to the conventional Sheth-Tormen (ST) formalism. Using a semi-empirical framework linking halo mass to UV luminosity, we show that the DP2 model reproduces the observed UV luminosity functions from $z=7$ to $14$ with moderate star formation efficiencies, whereas the ST model requires implausibly high efficiencies. Our results suggest that the JWST overabundance problem stems not from new physics beyond $\Lambda$CDM, but from oversimplified treatments of gravitational collapse, highlighting the critical role of small-scale dissipative dynamics in early structure formation.

arXiv comment10 pages, 3 figures (improved analysis)

References in corpus (66)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Cosmic Star Formation History
• Large scale bias and the peak background split
• Baryonic Features in the Matter Transfer Function
• Ellipsoidal collapse and an improved model for the number and spatial distribution of dark matter haloes
• UV Luminosity Functions at redshifts z~4 to z~10: 10000 Galaxies from HST Legacy Fields
• The Evolution of the Galaxy Rest-Frame Ultraviolet Luminosity Function Over the First Two Billion Years
• A population of red candidate massive galaxies ~600 Myr after the Big Bang
• A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch
• CEERS Key Paper I: An Early Look into the First 500 Myr of Galaxy Formation with JWST
• Two Remarkably Luminous Galaxy Candidates at $z\approx 10-12$ Revealed by JWST
• The evolution of the galaxy UV luminosity function at redshifts z ~ 8-15 from deep JWST and ground-based near-infrared imaging
• New Determinations of the UV Luminosity Functions from z~9 to z~2 show a remarkable consistency with halo growth and a constant star formation efficiency
• JADES NIRSpec Spectroscopy of GN-z11: Lyman-$\alpha$ emission and possible enhanced nitrogen abundance in a $z=10.60$ luminous galaxy
• A CEERS Discovery of an Accreting Supermassive Black Hole 570 Myr after the Big Bang: Identifying a Progenitor of Massive z > 6 Quasars
• Early results from GLASS-JWST. III: Galaxy candidates at z$\sim$9-15
• Stress Testing $\Lambda$CDM with High-redshift Galaxy Candidates
• Efficient Formation of Massive Galaxies at Cosmic Dawn by Feedback-Free Starbursts
• The Galaxy UV Luminosity Function Before the Epoch of Reionization
• Identification and properties of intense star-forming galaxies at redshifts z>10
• Spectroscopic confirmation of two luminous galaxies at $z\sim 14$
• On the stunning abundance of super-early, massive galaxies revealed by JWST
• The brightest galaxies at Cosmic Dawn
• Constraints on the Star Formation Efficiency of Galaxies During the Epoch of Reionization
• The Galaxy Luminosity Function during the Reionization Epoch
• JADES Imaging of GN-z11: Revealing the Morphology and Environment of a Luminous Galaxy 430 Myr After the Big Bang
• Galaxy Stellar Mass Functions from z~10 to z~6 using the Deepest Spitzer/IRAC Data: No Significant Evolution in the Stellar-to-Halo Mass Ratio of Galaxies in the First Gyr of Cosmic Time
• Extreme Value Statistics of the Halo and Stellar Mass Distributions at High Redshift: are JWST Results in Tension with ΛCDM?
• A physical model for the 0 < z < 8 redshift evolution of the galaxy UV luminosity and stellar mass functions
• Matter power spectrum: from Ly$\alpha$ forest to CMB scales
• Stochastic star formation in early galaxies: JWST implications
• Dark energy in light of the early JWST observations: case for a negative cosmological constant?
• Templates for Fitting Photometry of Ultra-High-Redshift Galaxies
• The Impact of Scatter in the Galaxy UV Luminosity to Halo Mass Relation on Ly$\alpha$ Visibility During the Epoch of Reionization
• The abundance of $z\gtrsim 10$ galaxy candidates in the HUDF using deep JWST NIRCam medium-band imaging
• Primordial power spectrum in light of JWST observations of high redshift galaxies
• Did JWST observe imprints of axion miniclusters or primordial black holes?
• Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies
• Witnessing the onset of reionisation via Lyman-$\alpha$ emission at redshift 13
• A double take on early and interacting dark energy from JWST
• New Roads to the Small-Scale Universe: Measurements of the Clustering of Matter with the High-Redshift UV Galaxy Luminosity Function
• The impact of an evolving stellar initial mass function on early galaxies and reionisation
• Sizes of Lensed Lower-luminosity z=4-8 Galaxies from the Hubble Frontier Field Program
• Rapidly growing primordial black holes as seeds of the massive high-redshift JWST Galaxies
• A high precision semi-analytic mass function
• Elevated UV luminosity density at Cosmic Dawn explained by non-evolving, weakly mass-dependent star formation efficiency
• On the Average Comoving Number Density of Halos
• Redshift-dependent galaxy formation efficiency at $z=5-13$ in the FirstLight simulations
• Primordial Black Hole Merger Rate in Ellipsoidal-Collapse Dark Matter Halo Models
• Primordial Black Hole Merger Rate in Self-Interacting Dark Matter Halo Models
• Compatibility of JWST results with exotic halos
• Compact Binary Merger Rate in Dark-Matter Spikes
• Enhanced Early Galaxy Formation in JWST from Axion Dark Matter?
• The Merger Rate of Primordial Black Hole-Neutron Star Binaries in Ellipsoidal-Collapse Dark Matter Halo Models
• Primordial Black Hole Merger Rate in $f(R)$ Gravity
• On the Merger Rate of Primordial Black Holes in Cosmic Voids
• Effect of a High-Precision Semi-Analytical Mass Function on the Merger Rate of Primordial Black Holes in Dark Matter Halos
• Explanation of high redshift luminous galaxies from JWST by early dark energy model
• Primordial Black Hole-Neutron Star Merger Rate in Modified Gravity
• Spherical Collapse Approach for Non-standard Dark Matter Models and Enhanced Early Galaxy Formation in JWST
• Explaining JWST star formation history at $z\sim 17$ by modifying $\Lambda$CDM
• Gravitational Lensing in More Realistic Dark Matter Halo Models
• Toward More Realistic Mass Functions For Ultradense Dark Matter Halos
• High-redshift Galaxies from JWST Observations in More Realistic Dark Matter Halo Models
• Halo mass functions at high redshift
• Ultradense Dark Matter Halos with Poisson Noise from Stellar-Mass Primordial Black Holes

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