70 AIM, UMR 7158, CEA/DRF, CNRS, Université Paris Diderot, Irfu/Service d'Astrophysique,
Centre de Saclay, FR-91191 Gif-sur-Yvette, France

We review recent works on the dynamics of circumbinary accretion, including time variability,
angular momentum transfer between the disk and the binary, and the secular evolution of …

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 …

The Square Kilometre Array (SKA) is a planned large radio interferometer designed to
operate over a wide range of frequencies, and with an order of magnitude greater sensitivity …

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 …

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 …

Using numerical hydrodynamics calculations and a novel method for densely sampling
parameter space, we measure the accretion and torque on a binary system from a …

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 …

Monitoring of vibrational eigenmodes of an elastic body excited by gravitational waves was
one of the first concepts proposed for the detection of gravitational waves. At laboratory …

The next two decades are expected to open the door to the first coincident detections of
electromagnetic (EM) and gravitational-wave (GW) signatures associated with massive …