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Astronomy · L5 · Primordial Black Holes: Formation and Dark-Matter Constraints · flowchart

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by @openstemUpdated Astronomy
Inflation seeds an enhancedcurvature perturbation on some scalePerturbation re-enters thehorizon during radiation dominationDensity contrast δexceeds threshold δc ~ 0.4-0.6?Direct collapse to a black hole(mass ≈ horizon mass)Perturbation disperses;no black hole formsMass > ~10^15 g?PBH survives to today —constrained by lensing, CMB, GWHawking evaporation complete —constrained by γ-ray backgroundYesNoYesNo

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