Ruling out Initially Clustered Primordial Black Holes as Dark Matter

Abstract

Combining constraints from microlensing and Lyman-$\alpha$ forest, we provide a simple argument to show that large spatial clustering of stellar-mass primordial black holes at the time of formation, such as the one induced by the presence of large non-Gaussianities, is ruled out. Therefore, it is not possible to evade existing constraints preventing stellar-mass primordial black holes to be a dominant constituent of the dark matter by boosting their initial clustering.

5 pages + supplementary material. 2 figures. v2: matching version published in PRL

References in corpus (7)

• Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
• Cosmic microwave background limits on accreting primordial black holes
• The merger rate of primordial-black-hole binaries
• Primordial Black Hole Dark Matter and the LIGO/Virgo observations
• Primordial Black Holes as Dark Matter: Converting Constraints from Monochromatic to Extended Mass Distributions
• Microlensing constraints on clustered primordial black holes
• Bondi-Hoyle-Lyttleton Accretion onto Star Clusters

Cited by in corpus (5)

• Primordial black holes: constraints, potential evidence and prospects
• Primordial Black-Hole-Based Pathways to Little Red Dots
• High-redshift Galaxies from JWST Observations in More Realistic Dark Matter Halo Models
• Primordial black hole driven cosmic acceleration
• Smoluchowski Coagulation Equation and the Evolution of Primordial Black Hole Clusters