Primordial black holes are under intense scrutiny since the detection of gravitational waves
from mergers of Solar-mass black holes in 2015. More recently, the development of …

The gravitational potential of initially Poisson distributed primordial black holes (PBH) can
induce a stochastic gravitational-wave background (SGWB) at second order in cosmological …

In this Letter, we derive for the first time a characteristic three-peaked GW signal within the
framework of no-scale Supergravity, being the low-energy limit of Superstring theory. We …

Pulsar timing array collaborations have recently announced the discovery of a stochastic
gravitational wave (GW) background at nanohertz frequencies. We analyze the GW signals …

Gravitational waves (GWs) in the MHz–GHz frequency range are motivated by a host of early
Universe phenomena such as oscillons, preheating, and cosmic strings. We point out that …

It has been recently proposed that Hawking evaporation might slow down after a black hole
has lost about half of its mass. Such an effect, called" memory burden", is parameterized as …

We analyze the classically scale-invariant BL model in the context of resonant leptogenesis
with the recently proposed mass-gain mechanism. The BL symmetry breaking in this …

In the post-LIGO era, there has been a lot of focus on primordial black holes (PBHs) heavier
than∼ 10 15 g as potential dark matter (DM) candidates. We point out that the branch of the …

A bstract Ultra-low mass primordial black holes (PBH), which may briefly dominate the
energy density of the universe but completely evaporate before the big bang …

Gravitational waves induced by large primordial curvature fluctuations may result in a
sizable stochastic gravitational wave background. Interestingly, curvature fluctuations are …