Blue-tilted spectral running and the JWST early galaxy tension

arXiv:2605.22161 · astro-ph.CO, astro-ph.GA, hep-ph · Submitted 2026-05-21 · Read on arXiv

astro-ph.CO, astro-ph.GA, hep-ph

Submitted: 2026-05-21

Updated: 2026-09-02

Comments: 17 pages, 4 figures, to appear in Phys. Rev. D

Journal ref: Phys.Rev.D 114 (2026) 6, 063537

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Abundance — 11× in this paper · explained in 1 episode
• James Webb Space Telescope — 3× in this paper
• Matter Power Spectrum — 3× in this paper · explained in 2 episodes
• Microlensing — 2× in this paper · explained in 2 episodes
• Gravitational Lensing — 1× in this paper · explained in 2 episodes
• Non-Gaussianity — 1× in this paper · explained in 2 episodes
• alpha — 1× in this paper · explained in 1 episode

Sources

• A population of red candidate massive galaxies ~600 Myr after the Big Bang
• Stress Testing $\Lambda$CDM with High-redshift Galaxy Candidates
• Has JWST already falsified dark-matter-driven galaxy formation?
• 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
• A redshift-independent efficiency model: star formation and stellar masses in dark matter halos at z>4
• The Universe at z>10: Predictions for JWST from the UniverseMachine DR1
• Primordial power spectrum in light of JWST observations of high redshift galaxies
• Early Structure Formation from Primordial Density Fluctuations with a Blue, Tilted Power Spectrum: High-Redshift Galaxies
• Structure formation with primordial black holes to alleviate early star formation tension revealed by JWST
• More varieties of hybrid inflation
• Black hole constraints on the running-mass inflation model
• Black hole formation and slow-roll inflation
• Generating Primordial Black Holes Via Hilltop-Type Inflation Models
• Running-Mass Inflation Model and Primordial Black Holes
• Running Spectral Index from Inflation with Modulations
• Runnings in the Curvaton
• Steepest growth of the power spectrum and primordial black holes
• Primordial Black Holes as Dark Matter and the Tachyonic Trap During Inflation
• Early Galaxies from Rare Inflationary Processes and JWST Observations
• Planck 2018 results. VI. Cosmological parameters

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