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 …

The pulsar timing array (PTA) collaborations have recently suggested the presence of a
gravitational wave background at nano-Hertz frequencies. In this paper, we explore potential …

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 …

Cosmological first-order phase transitions (1stOPTs) are said to be strongly supercooled
when the nucleation temperature is much smaller than the critical temperature. These are …

Recently, several major pulsar timing array (PTA) collaborations have assembled strong
evidence for the existence of a gravitational-wave background at frequencies around the …

The recent detection of a stochastic signal in the NANOGrav 15-year dataset has aroused
great interest in uncovering its origin. However, the evidence for the Hellings-Downs …

Recent observations from several pulsar timing array (PTA) collaborations have unveiled
compelling evidence for a stochastic signal in the nanohertz band. This signal aligns …

We develop a tool for the analysis of stochastic gravitational wave backgrounds from
cosmological first-order phase transitions with LISA: we initiate a template databank for …

In order to unravel the present situation of the PBH overproduction problem, our study
emphasizes the critical role played by the equation of state (EoS) parameter w within the …

Recently, multiple pulsar timing array collaborations have presented compelling evidence
for a stochastic signal at nanohertz frequencies, potentially originating from cosmic strings …