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

It is possible that primordial black holes constitute (or constituted) a significant fraction of the
energy budget of our universe. Terrestrial gravitational wave detectors offer the opportunity …

Pulsar timing arrays (PTAs) have revealed galaxy-size gravitational waves (GWs) in the form
of a stochastic gravitational wave background (SGWB), correlating the radio pulses emitted …

Enhancements of primordial curvature fluctuations in single field inflation often involve
departures from attractor trajectories in the phase space. We study enhancement …

In light of NANOGrav data, we provide for the first time possible observational signatures of
Superstring theory. First, we work with inflection-point inflationary potentials naturally …