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Early Structure Formation in $\Lambda$PBH Cosmologies
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abstract
Cold dark matter (CDM) could be composed of primordial black holes (PBH) in addition to or instead of more orthodox weakly interacting massive particle dark matter (PDM). We study the formation of the first structures in such $\Lambda$PBH cosmologies using $N$-body simulations evolved from deep in the radiation era to redshift 99. When PBH are only a small component of the CDM, they are clothed by PDM to form isolated halos. On the other hand, when PBH make most of the CDM, halos can also grow via clustering of many PBH. We find that the halo mass function is well modelled via Poisson statistics assuming random initial conditions. We quantify the nonlinear velocities induced by structure formation and find that they are too small to significantly impact CMB constraints. A chief challenge is how best to extrapolate our results to lower redshifts relevant for some observational constraints.
Forward citations
Cited by 6 Pith papers
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The swallowed spike: the formation of light primordial black hole structures around heavy seeds
No torque mechanism studied supplies enough angular momentum for the innermost light-PBH shells around a heavy seed, so the spike core is swallowed and far less dense than a WIMP spike.
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Do Primordial Black Hole Clusters Survive the Galaxy? Collisional Disruption and Microlensing Implications
Cluster-cluster collisions strip 50–96% of 10^6–10^7 M⊙ PBH cluster mass by z=0, so microlensing sightlines to the Magellanic Clouds are ~49–92% smooth.
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Primordial black hole induced gravitational waves in $f(R)$ gravity
In R^(1+ε) gravity, exponential growth of scalar perturbations during a PBH-driven early matter era enhances the induced gravitational wave signal, with Ω_GW ∝ f on large scales.
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Large-Scale Structure Probes of the Post-Inflationary Axiverse
HST ultraviolet luminosity function data at z=4-10, combined with Lyman-α and CMB data, place leading constraints on subdominant post-inflationary axion dark matter via its white-noise isocurvature perturbations.
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Influence of supermassive primordial black holes on ultraviolet luminosity of high-redshift galaxies
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.
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January Food Benchmark (JFB): A Public Benchmark Dataset and Evaluation Suite for Multimodal Food Analysis
The abstract promises a food-image benchmark and a winning model, but the manuscript pages contain only a different paper on primordial black holes, leaving every benchmark claim unsubstantiated.
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