Primordial Black Holes from CDM Isocurvature Perturbations

Abstract

We show that primordial black holes can be produced from the collapse of large isocurvature perturbations of the cold dark matter. We develop a novel procedure to compute the resulting black hole abundance by studying matched perturbations of matter-only universes, and we use our procedure to translate observational constraints on black hole abundances into model-independent constraints on cold dark matter isocurvature perturbations over a wide range of scales. The constraint on the typical amplitude of the primordial perturbations weakens slightly slower than linearly on small scales.

11 pages, 5 figures

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• The Interplay between the Dark Matter Axion and Primordial Black Holes
• Primordial black holes and induced gravitational waves from logarithmic non-Gaussianity
• Primordial black hole formation from massless scalar isocurvature
• STOLAS: STOchastic LAttice Simulation of cosmic inflation
• Compatibility of JWST results with exotic halos
• Strong lensing constraints on primordial black holes as a dark matter candidate
• Enhanced Early Galaxy Formation in JWST from Axion Dark Matter?
• Can we distinguish the adiabatic fluctuations and isocurvature fluctuations with pulsar timing arrays?
• Constraints on primordial black holes for nonstandard cosmologies
• Primordial Black Hole Formation in a Dust Bouncing Model
• Bayesian reconstruction of primordial perturbations from induced gravitational waves
• Gravitational waves induced by matter isocurvature in general cosmologies
• Enhanced Small-Scale Structure in the Cosmic Dark Ages
• Numerical simulations of primordial black hole formation via delayed first-order phase transitions
• An Analytic Treatment of Underdamped Axionic Blue Isocurvature Perturbations
• Cosmological long-wavelength solutions in non-adiabatic multi-fluid systems