Planck isocurvature constraint on primordial black holes lighter than a kiloton

Abstract

We demonstrate that primordial black holes (PBHs) lighter than $10^9\text{g}$, which evaporated before the big bang nucleosynthesis, can induce significant isocurvature perturbations due to their biased clustering amplitude and the branching ratio of the Hawking radiation differing from the abundance ratio. By leveraging the upper bound on the isocurvature perturbations from the cosmic microwave background anisotropies reported by the Planck collaboration, we derive a new upper bound on the abundance of these light PBHs in the presence of primordial non-Gaussianity as a working example.

Matches with the published version; discussions on PBH bias improved; 9 pages, 2 figures

References in corpus (12)

• Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
• Primordial Black Holes as Dark Matter: Recent Developments
• The merger rate of primordial-black-hole binaries
• Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events
• Understanding caustic crossings in giant arcs: characteristic scales, event rates, and constraints on compact dark matter
• On Effective Degrees of Freedom in the Early Universe
• The end of the MACHO era- revisited: new limits on MACHO masses from halo wide binaries
• Primordial black holes as biased tracers
• Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter
• Primordial black holes from scalar field evolution in the early universe
• Thermalization of large energy release in the early Universe
• Constraining Primordial Black Hole Fraction at the Galactic Centre using radio observational data