Abstract The Laser Interferometer Space Antenna (LISA) will be a transformative experiment
for gravitational wave astronomy, and, as such, it will offer unique opportunities to address …

Abstract The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders
about the fundamental theory of nature at play in the extreme gravity regime, where the …

We review numerous arguments for primordial black holes (PBHs) based on observational
evidence from a variety of lensing, dynamical, accretion and gravitational-wave effects. This …

We review recent trends in inflationary dynamics in the context of viable modified gravity
theories. After providing a general overview of the inflationary paradigm emphasizing on …

We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A
good fit is found for a string tension G μ∼ 10-12–10-11 and a string intercommutation …

Pulsar timing arrays gathered evidence of the presence of a gravitational wave background
around nHz frequencies. If the gravitational wave background was induced by large and …

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 …

Recently, pulsar timing array (PTA) experiments have provided compelling evidence for the
existence of the nanohertz stochastic gravitational wave background (SGWB). In this work …

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 …

Gravitational waves from a first-order cosmological phase transition, at temperatures at the
MeV-scale, would arguably be the most exciting explanation of the common red spectrum …