We provide a review on the state-of-the-art of gravitational waves induced by primordial
fluctuations, so-called induced gravitational waves. We present the intuitive physics behind …

We update the constraints on the fraction of the Universe that may have gone into primordial
black holes (PBHs) over the mass range 10− 5 to 10 50 g. Those smaller than∼ 10 15 g …

Primordial black holes - ScienceDirect Skip to main contentSkip to article Elsevier logo
Journals & Books Search RegisterSign in View PDF Download full book Search ScienceDirect …

In this paper, we propose a novel mechanism in Bbb T 2-inflation to enhance the power
spectrum large enough to seed primordial black holes (PBHs) formation. To accomplish this …

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 NANOGrav collaboration for the pulsar timing array (PTA) observation recently
announced evidence of an isotropic stochastic process, which may be the first detection of …

It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

The detection of gravitational waves from mergers of tens of Solar mass black hole binaries
has led to a surge in interest in primordial black holes (PBHs) as a dark matter candidate …

We derive analytic bounds on the shape of the primordial power spectrum in the context of
single-field inflation. In particular, the steepest possible growth has a spectral index of ns …

Primordial black holes may have formed in the radiative era of the early Universe from the
collapse of large enough amplitude perturbations of the metric. These correspond to non …