In CEB-obeying models, postulated distributions of primordial black holes decaying to radiation can fit CMB data, account for all dark matter, and seed the early galaxies detected by JWST, with some Planck-scale remnants also contributing to DM.
Constraints on the Primordial Black Hole Abundance using Pulsar Parameter Drifts
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abstract
Primordial black holes (PBHs) provide a compelling interpretation for the binary black holes (BBHs) observed by ground-based gravitational-wave (GW) detectors, especially for those BBHs in the theoretical mass gap. In the early Universe, the scalar perturbations required to produce such PBHs inevitably generate scalar-induced GWs (SIGWs). These SIGWs peak in the sub-nanohertz band, and manifest secularly as measurable jerk-like drifts in the second derivative of pulsar spin periods. In this Letter, we perform the first search for SIGWs using pulsar parameter drifts, and place a 95\% confidence-level upper limit on the PBH abundance of $f_{\mathrm{PBH}} < 10^{-10}$ over the mass range $[3 \times 10^{-1}, 4 \times 10^{4}] M_{\odot}$. Our results strongly disfavor a PBH origin for the BBHs currently detected by the LIGO-Virgo-KAGRA (LVK) Collaborations.
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Can Primordial Black Holes Be Seeds for Early Galaxies in Models Satisfying the Covariant Entropy Bound?
In CEB-obeying models, postulated distributions of primordial black holes decaying to radiation can fit CMB data, account for all dark matter, and seed the early galaxies detected by JWST, with some Planck-scale remnants also contributing to DM.