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 …

One century after its formulation, Einstein's general relativity (GR) has made remarkable
predictions and turned out to be compatible with all experimental tests. Most of these tests …

We report multiple lines of evidence for a stochastic signal that is correlated among 67
pulsars from the 15 yr pulsar timing data set collected by the North American Nanohertz …

Observing and timing a group of millisecond pulsars with high rotational stability enables the
direct detection of gravitational waves (GWs). The GW signals can be identified from the …

Pulsar timing arrays (PTAs) are galactic-scale gravitational wave (GW) detectors. Each
individual arm, composed of a millisecond pulsar, a radio telescope, and a kiloparsecs-long …

We present results from the search for a stochastic gravitational-wave background (GWB) as
predicted by the theory of General Relativity using six radio millisecond pulsars from the …

We present the third data release from the Parkes Pulsar Timing Array (PPTA) project. The
release contains observations of 32 pulsars obtained using the 64-m Parkes …

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 …

We present new limits on an isotropic stochastic gravitational-wave background (GWB)
using a six pulsar data set spanning 18 yr of observations from the 2015 European Pulsar …