Although the dark matter is usually assumed to be made up of some form of elementary
particle, primordial black holes (PBHs) could also provide some of it. However, various …

This article reviews current understanding of primordial black holes (PBHs), with particular
focus on those massive examples ($\gtrsim $$10^{15}~{\rm g} $) which remain at the …

The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for
Gravitational Waves (NANOGrav) shows positive evidence for the presence of a low …

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The NANOGrav Collaboration has recently published strong evidence for a stochastic
common-spectrum process that may be interpreted as a stochastic gravitational wave …

The possibility that the dark matter comprises primordial black holes (PBHs) is considered,
with particular emphasis on the currently allowed mass windows at 1 0 16–1 0 17 g, 1 0 20 …

We review the formation and evaporation of primordial black holes (PBHs) and their
possible contribution to dark matter. Various constraints suggest they could only provide …

Primordial black holes (PBHs) could provide the dark matter in various mass windows below
102 M⊙ and those of 30 M⊙ might explain the LIGO events. PBHs much larger than this …

We review conceptual aspects of inflationary scenarios able to produce primordial black
holes by amplifying the size of curvature fluctuations to the level required to trigger black …

We construct a single-field model of inflation that achieves remarkable agreement with
Planck and BICEP/Keck cosmological observations. The model, via the presence of an …