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 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 …

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The recently released data by pulsar timing array (PTA) collaborations present strong
evidence for a stochastic signal consistent with a gravitational-wave background. Assuming …

Abstract Recently, the NANOGrav, PPTA, EPTA, and CPTA Collaborations independently
reported their evidence of the Stochastic Gravitational Waves Background (SGWB). While …

The power-law parametrization for the energy density spectrum of gravitational wave (GW)
background is a useful tool to study its physics and origin. While scalar induced secondary …

We construct an analytically solvable simplified model that captures the essential features
for primordial black hole (PBH) production in most models of single-field inflation. The …

Several pulsar timing array (PTA) collaborations, including NANOGrav, EPTA, PPTA, and
CPTA, have announced the evidence for a stochastic signal consistent with a stochastic …

The stochastic signal detected by pulsar timing arrays (PTAs) has raised great interest in
understanding its physical origin. Assuming the signal is a cosmological gravitational-wave …

The recently released data by pulsar timing array (PTA) collaborations have amassed
substantial evidence corroborating the existence of a stochastic signal consistent with a …