Pulsar timing array (PTA) collaborations in North America, Australia, and Europe, have been
exploiting the exquisite timing precision of millisecond pulsars over decades of observations …

Gravitational waves (GWs) provide a new tool to probe the nature of dark energy (DE) and
the fundamental properties of gravity. We review the different ways in which GWs can be …

Evidence for a low-frequency stochastic gravitational-wave background has recently been
reported based on analyses of pulsar timing array data. The most likely source of such a …

We present high-precision timing data over time spans of up to 11 years for 45 millisecond
pulsars observed as part of the North American Nanohertz Observatory for Gravitational …

ABSTRACT The International Pulsar Timing Array 2nd data release is the combination of
data sets from worldwide collaborations. In this study, we search for continuous waves …

In this paper, we describe the International Pulsar Timing Array second data release, which
includes recent pulsar timing data obtained by three regional consortia: the European Pulsar …

The highly stable spin of neutron stars can be exploited for a variety of (astro) physical
investigations. In particular, arrays of pulsars with rotational periods of the order of …

Ultralight boson fields, with a mass around 10-23 eV, are promising candidates for the
elusive cosmological dark matter. These fields induce a periodic oscillation of the spacetime …

We describe 14 yr of public data from the Parkes Pulsar Timing Array (PPTA), an ongoing
project that is producing precise measurements of pulse times of arrival from 26 millisecond …

Hierarchical assembly models predict a population of supermassive black hole (SMBH)
binaries. These are not resolvable by direct imaging but may be detectable via periodic …