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Supermassive primordial black holes with masses near 10^6.3–10^8.3 solar masses and tiny abundances can fit the JWST bright-galaxy excess at z≳10.

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Fitting a model of supermassive primordial black holes to JWST data at z=11 reproduces the excess of bright galaxies, but the agreement reflects parameter tuning rather than an independent test.

T0 review reviewed 2026-08-05 challenge →

load-bearing objection The MCMC is careful, but the global per-halo PBH occupation in Eq. (11) makes the claimed JWST fit an artifact; fix that before citing the constraints. the 4 major comments →

arxiv 2509.03152 v3 pith:XG63AAEK submitted 2025-09-03 astro-ph.GA astro-ph.CO

Influence of supermassive primordial black holes on ultraviolet luminosity of high-redshift galaxies

Yi-Yang Li , Hai-Long Huang , Yun-Song Piao This is my paper
classification astro-ph.GA astro-ph.CO
keywords supermassive primordial black holesUV luminosity functionhigh-redshift galaxiesJWST excessaccretion luminosityhalo mass functionPoisson fluctuationsMarkov chain Monte Carlo
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

JWST observes more bright galaxies at z≳10 than the standard galaxy-formation model predicts. The paper tries to establish that supermassive primordial black holes (SMPBHs) formed as inflationary vacuum bubbles supply the missing ultraviolet light, with no need for extreme star-formation efficiency. It models two channels—Poisson fluctuations in the black-hole number density that boost the halo mass function, and sub-Eddington accretion that adds intrinsic UV emission—and fits the z=11 luminosity function by Markov chain Monte Carlo. The fit prefers characteristic masses M_PBH ≈ 10^6.3–10^8.3 M_sun, abundances f_PBH ≈ 10^-7–10^-5, and Eddington ratios λ_E ≤ 0.1. If right, the same population doubles as seeds for the supermassive black holes seen in later galaxies.

Core claim

The central claim is that the observed excess of luminous galaxies at z≳10 is explained by an accreting population of supermassive primordial black holes with a specific, peak-like mass distribution. The model computes the total galaxy UV luminosity as the sum of a stellar component from an empirical halo-mass–UV-magnitude relation and a PBH component from L_bol = λ_E L_Edd converted to 1450 Å luminosity. Because PBH counts inside halos are Poisson-distributed, the total luminosity is a convolution of stellar light with a compound Poisson process, which boosts the bright end of the UV luminosity function. MCMC posteriors give log f_PBH ≈ -5.6 to -7.6, log(M_PBH/M_sun) ≈ 8.3, 7.3, 6.3 for fix

What carries the argument

The carrying object is the extended, number-density-normalized PBH mass function ψ3(m) ∝ m^(-5/2) exp[-ln^2(m/M_PBH)/(2σ²)], rooted in a peak-like distribution from inflationary vacuum bubbles; its steep high-mass tail provides the massive black holes that matter for luminosity. The second mechanism is the compound Poisson luminosity distribution: Poisson fluctuations in PBH number density within halos both modify the halo mass function and, combined with the bolometric-to-UV conversion L_UV = L_bol [1.862(L_bol/10^10 L_sun)^(-0.361) + 4.870(L_bol/10^10 L_sun)^(-0.0063)], add a stochastic UV component on top of the empirical stellar luminosity. MCMC over M_PBH, f_PBH, and σ at fixed Eddingto

Load-bearing premise

The whole fit presupposes that supermassive primordial black holes exist with the specific peak-like mass distribution produced by inflationary vacuum bubbles; if that production mechanism does not operate, or the mass distribution differs, the inferred parameter ranges have no physical basis and the explanation of the JWST excess is an artifact of the assumed population.

What would settle it

Take deeper JWST spectroscopy of faint and bright galaxies at z≈11: if the bright-end excess is fully accounted for by ordinary star formation at the efficiencies already measured at z=4–9, or the galaxies show no sign of accretion (broad lines, variability, X-rays), the SMPBH luminosity channel is unnecessary. Alternatively, a 21-cm measurement that rules out the Poisson boost to the small-scale matter power spectrum would falsify the halo-mass-function mechanism.

Watch this falsifier. Get emailed when new claim-graph text bears on it.

If this is right

  • The bright end of the z≈11 UV luminosity function is lifted by the high-mass tail of ψ3; the preferred width σ≈1.4 is large enough to supply rare, very massive PBHs.
  • M_PBH λ_E ≈ 10^6.26 M_sun across the three fixed Eddington ratios, so lower accretion efficiency is compensated by higher characteristic PBH mass at roughly constant number density.
  • With λ_E = 0 the Poisson effect alone cannot reproduce the bright-end excess; intrinsic sub-Eddington emission from accreting PBHs is the dominant channel.
  • The same SMPBHs act as supermassive-black-hole seeds at z≲20, linking the UV excess to the massive black holes seen in later epochs.
  • No extreme star-formation efficiency or redshift-dependent star-formation efficiency is required; standard ΛCDM with the fitted SMPBH component fits the JWST bright end.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • An untested consequence: if these PBHs dominate the bright-end light, the same galaxies should show signatures of accretion (X-ray or infrared emission, variability), which the paper does not check.
  • The degeneracy M_PBH λ_E ≈ const means independent constraints on either parameter—for example from gravitational-wave backgrounds or clustering—are needed to fix the population uniquely.
  • The appendix's power-spectrum calculation implies the extended distribution changes the Poisson cutoff scale relative to monochromatic PBHs; 21-cm or small-scale CMB measurements could distinguish the two, a forecast the paper does not make.
  • Because the Eddington ratio is fixed to discrete values, allowing λ_E to vary with halo mass or redshift is a natural test of whether one universal sub-Eddington ratio suffices.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. The paper proposes that supermassive primordial black holes (SMPBHs) with an extended, peak-like mass distribution from inflationary vacuum bubbles can explain the JWST bright-end excess in the high-redshift galaxy UV luminosity function. The model adds PBH accretion luminosity to a stellar UV luminosity–halo mass relation, treats the number of PBHs per halo with a Poisson distribution, and uses MCMC to constrain log f_PBH, log M_PBH, and σ for fixed Eddington ratios λ_E = 0.01, 0.1, and 1. The authors report best-fit parameters and show that the model at z = 11 increases the bright-end UV LF relative to standard ΛCDM, claiming consistency with JWST data.

Significance. If the result holds, it provides a concrete and testable parameter region for SMPBHs as an explanation of the JWST high-redshift galaxy excess, and the appendices contain useful formalism for extended PBH mass functions and the associated Poisson contribution to the matter power spectrum. The paper includes an MCMC implementation and posterior tables, which are valuable. However, the claimed consistency is a fit to the very data it is said to explain, and several modeling choices—the mass-independent PBH occupation prescription, the unspecified M_min(z), the ambiguous role of the PBH-modified power spectrum, and the lack of propagated uncertainties in the stellar baseline—mean the quoted posteriors are effective parameters of an incompletely specified model rather than robust physical inferences. These issues are fixable but require substantive additional analysis.

major comments (4)
  1. [III.B, Eq. (11)] The occupation prescription assigns a single mean λ = n0/nhalo to every halo, independent of halo mass. For PBHs as a dark-matter component, the expected number in a halo is λ(M_halo) = f_PBH M_halo/<m>, scaling with halo mass. The bright end of the UV LF is dominated by the most massive halos, so the constant-λ assumption underassigns PBHs there and overassigns them in low-mass halos; the MCMC posteriors therefore describe an effective occupation model, not physical f_PBH and M_PBH. Additionally, M_min(z) is never specified, leaving nhalo and hence λ undefined and f_PBH degenerate with this choice. Please adopt a mass-dependent occupation and state M_min(z) explicitly.
  2. [III.A and Appendix B] It is unclear whether the HMF used in the fits is the standard ΛCDM Sheth-Tormen HMF or the PBH-modified HMF derived in Appendix B. Section III.A says only that 'the HMF can be calculated with the Sheth-Tormen algorithm', without specifying the input power spectrum; Appendix B derives P_PBH and Figure 4 shows modified HMFs, but the main text does not state that this modified P(k) is used in the MCMC. This matters because Poisson-enhanced halo abundance independently boosts the bright end. If the modified HMF is used, it should appear in the model equations; if not, Appendix B is not part of the fits.
  3. [III.C / Fig. 3] The abstract's claim that the model is 'consistent with JWST observations' is a result of fitting log f_PBH, log M_PBH, and σ directly to those data. The paper reports no quantitative model comparison against the standard ΛCDM baseline, such as Δχ², AIC/BIC, or a posterior predictive check. Without such a comparison, the improved bright-end fit is an expected by-product of the fit, not evidence that the SMPBH model is favored. Please add a formal model comparison and discuss whether the extra parameters are warranted by the data.
  4. [III.A, Eq. (8)] The stellar baseline M_UV(M_halo,z) is obtained by fitting the six parameters p1–p6 to observed UV LF data at z = 4–9, then extrapolated to z = 11 and used inside the same likelihood that constrains PBH parameters. The paper does not propagate uncertainties in p_i; the PBH posteriors are conditional on this ad hoc baseline. Please either sample p_i jointly with the PBH parameters or quantify the sensitivity of the f_PBH–M_PBH constraints to the p_i values.
minor comments (5)
  1. [Abstract / Introduction] Grammar: 'Recently James Webb Space Telescope have observed' and 'JWST have' should be 'has observed'/'has'.
  2. [Appendix B, Eq. (B3)] The symbol 'Mc' is used in Eq. (B3) but is not defined; the main text uses M_PBH. Please make the notation consistent.
  3. [Abstract / Table II] The abstract emphasizes sub-Eddington ratios λ_E << 1, but Table II also reports fits with λ_E = 1. Clarify whether λ_E = 1 is part of the central claim or an auxiliary check.
  4. [III.B, footnote 4] The footnote says low-mass halos only matter when PBH luminosity far exceeds the stellar component, but no quantitative threshold or M_min(z) function is given. This should be specified.
  5. [Fig. 2 caption] The color ordering in the caption (λ_E = 0.100 red, 1.000 blue, 0.010 gray) is inconsistent with the ordering in Table II; please align them for readability.

Circularity Check

1 steps flagged

The claimed JWST consistency is an in-sample fit: the MCMC optimizes PBH parameters against the same bright-end UV LF data that the model is then said to 'account for'.

specific steps
  1. fitted input called prediction [Sec. III.B likelihood; Sec. III.C Results and Fig. 3]
    "The results show that the inclusion of SMPBHs, especially with accretion emission, leads to a significantly improved fit to the observed data at the bright end [6, 14]. This demonstrates that our SMPBHs model can account for the excess of luminous galaxies detected by JWST."

    The JWST bright-end data [6,14] are precisely the φ_obs,i entering the log-likelihood in Sec. III.B. The MCMC (Table I) varies log f_PBH, log M_PBH, and σ to minimize (log φ_model,i - log φ_obs,i)^2 at these magnitudes. Therefore the 'significantly improved fit' and 'can account for the excess' restate the optimization: the model's bright end is pushed toward the observed points by construction. No withheld data, out-of-sample prediction, or fixed-from-first-principles parameter set is used; the consistency is an in-sample property of the fit.

full rationale

The paper's forward model (mass function Eq. 1, luminosity conversion Eq. 5, Poisson occupation Eq. 11) is a genuine model, and the mass-function shape is a theoretical premise from earlier work, not derived from the JWST data, so the self-citations [70,80] are not by themselves circular under rule 4. The Eq. (11) mass-independent mean occupation is a physical modeling concern that could bias parameters, but it is not a definitional circularity. The clear circular step is interpretive: the same JWST UV LF data that define the 'excess' are used both to optimize the PBH parameters and then to conclude that the model 'can account for' that excess. That is a fitted input presented as an explanation, so the central consistency claim reduces to the fit. Score 6 reflects partial circularity: the model still has independent theoretical content, but the headline validation is not an independent confirmation.

Axiom & Free-Parameter Ledger

6 free parameters · 6 axioms · 1 invented entities

The central claim depends on fitted parameters (PBH mass, abundance, distribution width, Eddington ratio) and on a hypothesized PBH population whose mass function and existence are taken from the authors' own prior work. No independent evidence is offered for the PBH population, and the main free parameters are tuned directly to the target JWST data.

free parameters (6)
  • p1-p6 = p1=-13.12, p2=-8.94, p3=-0.0355, p4=5.78, p5=-3.84, p6=0.341 (Eq. 9)
    Parameters of the empirical Mhalo-MUV relation, fit to low-redshift UV LF data (z=4-9); treated as fixed in the MCMC without error propagation.
  • log10(f_PBH) = -5.60 to -7.59 depending on lambda_E (Table II)
    PBH abundance relative to dark matter, sampled in MCMC.
  • log10(M_PBH/M_sun) = 8.26, 7.26, 6.26 for lambda_E=0.01,0.1,1
    Characteristic PBH mass, sampled in MCMC.
  • sigma = ~1.4
    Width of PBH mass distribution, sampled in MCMC.
  • lambda_E = fixed at 0.01, 0.1, 1
    Eddington ratio assumed same for all PBHs; not sampled.
  • M_min(z) = unspecified
    Minimum halo mass hosting PBHs, used in Eq. (11); no value or redshift evolution given.
axioms (6)
  • standard math Sheth-Tormen halo mass function
    Used to compute dn/dMhalo for the UV LF (Section III A, Ref. [82]).
  • standard math Compound Poisson statistics for PBHs in halos
    Used to build the total PBH luminosity distribution (Section III B).
  • domain assumption SMPBHs exist with mass function Eq. (1) from inflationary vacuum bubbles
    Imported from Ref. [70] (same group); no independent evidence or derivation in this paper.
  • domain assumption All PBHs have the same Eddington ratio lambda_E
    Stated in footnote 3; acknowledged as a simplification.
  • domain assumption Additive stellar and PBH luminosities
    Eq. (10); ignores dust, obscuration, and duty cycle effects.
  • domain assumption PBHs only reside in halos with M > M_min
    Footnote 4; M_min is unspecified.
invented entities (1)
  • Supermassive primordial black holes from inflationary vacuum bubbles no independent evidence
    purpose: Provide additional UV luminosity and Poisson boost to explain bright JWST galaxies
    The PBH population is hypothesized based on a prior mechanism; there is no independent detection and its parameters are inferred from the very data it explains.

reviewed 2026-08-05 · how reviews work

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Cite this review

Pith. "Pith review of Influence of supermassive primordial black holes on ultraviolet luminosity of high-redshift galaxies." pith.science (2026). https://pith.science/paper/XG63AAEK

@misc{pith2026250903152,
  author       = {Pith},
  title        = {Pith review of: Influence of supermassive primordial black holes on ultraviolet luminosity of high-redshift galaxies},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/XG63AAEK}},
  note         = {Machine review of arXiv:2509.03152}
}
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abstract

Recently James Webb Space Telescope (JWST) have observed an excess of luminous galaxies at high redshifts ($z \gtrsim 10$). In this work, we investigate whether supermassive primordial black holes (SMPBHs) can explain it by their influence on the ultraviolet luminosity function (UV LF) of high-redshift galaxies. Through Markov Chain Monte Carlo analysis, we constrain the parameters relevant with SMPBHs against current JWST observational data. The results reveal that SMPBHs with masses $M_{\rm PBH} \sim 10^{6.3\text{-}8.3} M_\odot$, abundances $f_{\rm PBH} \sim 10^{-7}\text{-}10^{-5}$, and sub-Eddington ratios $\lambda_E \ll 1$ can effectively enhance the bright end of the UV LF, consistent with JWST observations.

Figures

Figures reproduced from arXiv: 2509.03152 by Hai-Long Huang, Yi-Yang Li, Yun-Song Piao.

Figure 1
Figure 1. Figure 1: FIG. 1: The corresponding UV LF in Eq. ( [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: The MCMC posterior distributions at redshift [PITH_FULL_IMAGE:figures/full_fig_p009_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Influence of SMPBHs with the mass spectrum ( [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: Left panel: Matter power spectra at [PITH_FULL_IMAGE:figures/full_fig_p013_4.png] view at source ↗

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This paper was first reviewed by deepseek-v4-flash on August 5, 2026.