The exploration of the universe has recently entered a new era thanks to the multi-
messenger paradigm, characterized by a continuous increase in the quantity and quality of …

The collection of individually resolvable gravitational wave (GW) events makes up a tiny
fraction of all GW signals that reach our detectors, while most lie below the confusion limit …

Abstract The North American Nanohertz Observatory for Gravitational Waves (NANOGrav)
has reported evidence for the presence of an isotropic nanohertz gravitational-wave …

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 …

NANOGrav and other Pulsar Timing Arrays (PTAs) have discovered a common-spectrum
process in the nHz range that may be due to gravitational waves (GWs): if so, they are likely …

It has been a half-decade since the first direct detection of gravitational waves, which
signifies the coming of the era of the gravitational-wave astronomy and gravitational-wave …

Anisotropies in the nanohertz gravitational-wave background are a compelling next target
for pulsar timing arrays (PTAs). Measurements or informative upper limits to the anisotropies …

Gravitational waves (GWs) influence the arrival times of radio signals coming from pulsars.
Here, we investigate the harmonic space approach to describing a pulsar's response to …

Hundreds of millions of supermassive black hole binaries are expected to contribute to the
gravitational-wave signal in the nanohertz frequency band. Their signal is often …

Statistical anisotropy in the nanohertz-frequency gravitational wave background (GWB) is
expected to be detected by pulsar timing arrays (PTAs) in the near future. By develo** a …