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Searching for a subpopulation of primordial black holes in LIGO/Virgo gravitational-wave data
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With several dozen binary black hole events detected by LIGO/Virgo to date and many more expected in the next few years, gravitational-wave astronomy is shifting from individual-event analyses to population studies. Using the GWTC-2 catalog, we perform a hierarchical Bayesian analysis that for the first time combines several state-of-the-art astrophysical formation models with a population of primordial black holes (PBHs) and constrains the fraction of a putative subpopulation of PBHs in the data. We find that this fraction depends significantly on the set of assumed astrophysical models. While a primordial population is statistically favored against certain competitive astrophysical channels, such as globular clusters and nuclear stellar clusters, a dominant contribution from the stable-mass-transfer isolated formation channel drastically reduces the need for PBHs, except for explaining the rate of mass-gap events like GW190521. The tantalizing possibility that black holes formed after inflation are contributing to LIGO/Virgo observations could only be verified by further reducing uncertainties in astrophysical and primordial formation models, and it may ultimately be confirmed by third-generation interferometers.
Forward citations
Cited by 11 Pith papers
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Constraints on primordial black holes from the first part of LIGO-Virgo-KAGRA fourth observing run
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Primordial Black Hole from Tensor-induced Density Fluctuation: First-order Phase Transitions and Domain Walls
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Primordial black hole induced gravitational waves in $f(R)$ gravity
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Complementary Probes of Warped Extra Dimension: Colliders, Gravitational Waves and Primordial Black Holes from Phase Transitions
In Randall-Sundrum warped extra dimension models, the supercooled radion phase transition can form primordial black holes that account for all of dark matter for IR scales 10 TeV to 10^4 TeV, with correlated gravitati...
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The Irrelevance of Primordial Black Hole Clustering in the LVK mass range
Initial spatial clustering of primordial black holes is irrelevant for binary mergers in the LVK mass range because FIRAS spectral-distortion constraints limit the clustering scale to below the merger-relevant separat...
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Scalar-induced gravitational waves from a box-shaped curvature power spectrum
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Constraints on Primordial Black Hole Dressed by Dark Matter Halo from Microlensing Effect of Fast Radio Bursts
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Binary Black Hole Phase Space Discovers the Signature of Pair Instability Supernovae Mass Gap
Applying a phase-space overlap method to GWTC-4, the paper claims first-generation black holes are truncated near 45.5 solar masses, but the cutoff follows from the assumed exponential mass prior rather than from the data.
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Whispers from the Early Universe: The Ringdown of Primordial Black Holes
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