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Constraints on the primordial curvature power spectrum from primordial black holes
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Large-amplitude density perturbations may have collapsed during the radiation dominated epoch of the Universe to form primordial black holes (PBHs). There are several constraints to the abundance of PBHs that stem from evaporation or gravitational effects. Due to the connection between primordial perturbations and the formation of PBHs, constraints on the present-day abundance of PBHs can be translated into limits on the primordial curvature power spectrum. We introduce several new observational and forecasted constraints to the amplitude of the primordial power spectrum and incorporate in our analysis uncertainties in the critical overdensity for collapse and considerations of ellipsoidal collapse. Our results provide the most stringent limits from PBHs on the primordial curvature power spectrum on small scales.
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Cited by 2 Pith papers
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From Primordial Black Holes Abundance to Primordial Curvature Power Spectrum (and back)
Using numerical relativity thresholds, cosmological perturbation theory, and peak theory, the authors derive updated upper limits on the small-scale primordial curvature power spectrum from primordial black hole abund...
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Primordial black holes from sound speed resonance in the inflaton-curvaton mixed scenario
Primordial black holes with a narrow mass spectrum can form from parametric resonance in the curvaton sector of an inflaton-curvaton model, possibly providing a dark matter candidate.
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