Do we need fine-tuning to create primordial black holes?
arXiv:1811.01126 · doi:10.1103/PhysRevD.99.023504
Abstract
Recently, the formation of primordial black holes (PBHs) from the collapse of primordial fluctuations has received much attention. The abundance of PBHs formed during radiation domination is sensitive to the tail of the probability distribution of primordial fluctuations. We quantify the level of fine-tuning due to this sensitivity. For example, if the main source of dark matter is PBHs with mass , then anthropic reasoning suggests that the dark matter to baryon ratio should range between 1 and 300. For this to happen, the root-mean-square amplitude of the curvature perturbation has to be fine-tuned within a range. As another example, if the recently detected gravitational-wave events are to be explained by PBHs, the corresponding degree of fine-tuning is . We also find, however, that these fine-tunings can be relaxed if the primordial fluctuations are highly non-Gaussian, or if the PBHs are formed during an early-matter-dominated phase. We also note that no fine-tuning is needed for the scenario of a reheating of the universe by evaporated PBHs with Planck-mass relics left to serve as dark matter.
arXiv comment6 pages
References in corpus (31)
- Observation of Gravitational Waves from a Binary Black Hole Merger
- Did LIGO detect dark matter?
- New cosmological constraints on primordial black holes
- Primordial Black Hole Scenario for the Gravitational-Wave Event GW150914
- The clustering of massive Primordial Black Holes as Dark Matter: measuring their mass distribution with Advanced LIGO
- Dimensionless constants, cosmology and other dark matters
- Gravitational Wave signatures of inflationary models from Primordial Black Hole Dark Matter
- Calculating the mass spectrum of primordial black holes
- Stochastic gravitational waves associated with the formation of primordial black holes
- On Effective Degrees of Freedom in the Early Universe
- Primordial Black Holes from Inflation and non-Gaussianity
- Baryon Asymmetry, Dark Matter, and Density Perturbation from PBH
- Primordial black holes as a tool for constraining non-Gaussianity
- Primordial Black Holes from Sound Speed Resonance during Inflation
- Spins of primordial black holes formed in the matter-dominated phase of the Universe
- Primordial Black Holes from Polynomial Potentials in Single Field Inflation
- Primordial Black Holes from Inflaton Fragmentation into Oscillons
- Double inflation as a single origin of primordial black holes for all dark matter and LIGO observations
- Primordial black hole formation in the matter-dominated phase of the Universe
- Limits on primordial black holes from distortions in cosmic microwave background
- Primordial black holes from inflaton and spectator field perturbations in a matter-dominated era
- Quantum diffusion beyond slow-roll: implications for primordial black-hole production
- Primordial black holes as biased tracers
- Signatures of non-gaussianity in the isocurvature modes of primordial black hole dark matter
- Supermassive black holes formed by direct collapse of inflationary perturbations
- Baryogenesis from Hawking Radiation
- Baryon asymmetry from primordial black holes
- Effect of Inhomogeneity on Primordial Black Hole Formation in the Matter Dominated Era
- Primordial Black Hole Formation During Slow Reheating After Inflation
- Primordial Black Holes and the String Swampland
- Gauging Fine-Tuning
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- Primordial black holes from single-field inflation: a fine-tuning audit
- PBH remnants as dark matter produced in thermal, matter and runaway-quintessence post-inflationary scenarios
- Primordial black holes from null energy condition violation during inflation
- Constraints on a mixed model of dark matter particles and primordial black holes from the Galactic 511 keV line
- Ultra-low mass PBHs in the early universe can explain the PTA signal
- Detectability of Gravitational Waves from the Coalescence of Massive Primordial Black Holes with Initial Clustering
- Primordial Black Hole Formation in Non-Standard Post-Inflationary Epochs
- Solar Mass Primordial Black Holes in Moduli Dominated Universe
- Development of generic no-scale inflation