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X-ray and gamma-ray limits on the primordial black hole abundance from Hawking radiation
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abstract
The non-observation of Hawking radiation from primordial black holes of $10^{16}$g sets a conservative strong bound on their cosmological abundance. We revisit this bound and show how it can be improved (both in mass reach and strength) by an adequate modeling of the combined AGN and blazar emission in the MeV range. We also estimate the sensitivity to the primordial black hole abundance of a future X-ray experiment capable of identifying a significantly larger number of astrophysical sources contributing to the diffuse background in this energy range.
Forward citations
Cited by 8 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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Bounds on PBH fraction in a stimulated axion/ALP decay scenario
Stimulated axion decay around superradiant primordial black holes yields photon fluxes that exceed observed backgrounds, forcing f_PBH < 10^-17 for PBH masses 10^-19 to 10^-7 solar masses.
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Antinuclei from Primordial Black Holes
AMS-02 antiproton data set the tightest limits yet on Galactic primordial black holes with lognormal mass distributions, and cap the expected antideuteron flux below the reach of upcoming detectors.
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Machine Learning-Based Analytical Expressions for Gray-Body Factors and Application to Primordial Black Holes
Symbolic regression is used to derive compact error-function approximations for Schwarzschild gray-body factors, and the approximations reproduce the Hawking spectra and primordial black hole constraints from full num...
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Page Time of Primordial Black Holes in the Standard Model and Beyond
For Standard Model emission, a Schwarzschild primordial black hole of about 6.23 x 10^14 grams would reach its Page time at the current age of the Universe.
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Probing light axion-like particle via primordial black hole evaporation with gamma-ray observations
PBH-emitted ALPs converting in cosmic magnetic fields, and PBH electrons scattering off ALP dark-matter halos, could create gamma-ray signals detectable by AMEGO, e-ASTROGAM, and MAST, with projected coupling reach ne...
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Relativistic accretion and burdened primordial black holes
Combining relativistic accretion with memory-burdened evaporation widens the parameter space for primordial black holes as dark matter and changes dark matter and dark radiation emission predictions.
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Searching for Dark Matter with MeVCube
Using Fisher forecasting, the author shows that a 2U to 12U MeVCube CubeSat could probe new dark matter parameter space for evaporating primordial black holes and MeV-scale decaying or annihilating dark matter.
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