The first generation of stars, often called Population III (or Pop III), form from metal-free
primordial gas at redshifts z∼ 30 and below. They dominate the cosmic star-formation …

Massive black holes (MBHs) inhabit galactic centres, and power luminous quasars and
active galactic nuclei, sha** their cosmic environment with the energy they produce. The …

Abstract The Einstein Telescope (ET), the European project for a third-generation
gravitational-wave detector, has a reference configuration based on a triangular shape …

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Although the dark matter is usually assumed to be made up of some form of elementary
particle, primordial black holes (PBHs) could also provide some of it. However, various …

The second LIGO–Virgo catalog of gravitational-wave (GW) transients has more than
quadrupled the observational sample of binary black holes. We analyze this catalog using a …

Gravitational-wave detections are enabling measurements of the rate of coalescences of
binaries composed of two compact objects—neutron stars and/or black holes. The …

In the recent years, primordial black holes (PBHs) have emerged as one of the most
interesting and hotly debated topics in cosmology. Among other possibilities, PBHs could …

The astrophysical origin of gravitational wave (GW) events discovered by LIGO/VIRGO
remains an outstanding puzzle. In active galactic nuclei (AGNs), compact-object binaries …

The first observational run of the Advanced LIGO detectors, from September 12, 2015 to
January 19, 2016, saw the first detections of gravitational waves from binary black hole …