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Did JWST observe imprints of axion miniclusters or primordial black holes?
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Did JWST observe imprints of axion miniclusters or primordial black holes?
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The James Webb Space Telescope has detected surprisingly luminous early galaxies that indicate a tension with the $\Lambda$CDM. Motivated by scenarios including axion miniclusters or primordial black holes, we consider power-law modifications of the matter power spectrum. We show that the tension could be resolved if dark matter consists of $2\times 10^{-18}{\rm eV}$ axions or if a fraction $f_{\rm PBH} > 0.005$ of dark matter is composed of compact heavy $4\times 10^6 M_\odot (f_{\rm PBH}/0.005)^{-1}$ structures such as primordial black hole clusters. However, in both cases, the star formation efficiency needs to be significantly enhanced.
Forward citations
Cited by 4 Pith papers
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Primordial Black Hole from Tensor-induced Density Fluctuation: First-order Phase Transitions and Domain Walls
Tensor perturbations from first-order phase transitions and domain wall annihilation induce curvature fluctuations at second order that form primordial black holes, allowing asteroid-mass PBHs to comprise all dark mat...
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Primordial Black Hole from Tensor-induced Density Fluctuation: First-order Phase Transitions and Domain Walls
Tensor perturbations from FOPT and domain-wall sources are claimed to induce second-order scalar perturbations large enough to form primordial black holes, potentially all of the dark matter.
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Probing inflationary features with galaxy ultraviolet luminosity function observables
Galaxy UV luminosity function data at z=6–9 give upper limits on bump-like inflationary features at k≈0.3–20 Mpc^-1, similar to but not stronger than optical-depth constraints.
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Statistics Meet Systematics: Resolution of the Massive Early JWST Galaxy Tension
Systematic uncertainties in JWST stellar-mass estimates, amplified by Eddington bias, resolve the apparent requirement for unphysically high star-formation efficiencies in massive high-redshift galaxies.
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