A stochastic background of gravitational waves could be created by the superposition of a
large number of independent sources. The physical processes occurring at the earliest …

We review detection methods that are currently in use or have been proposed to search for a
stochastic background of gravitational radiation. We consider both Bayesian and frequentist …

In this work, we study the prospect of detecting the stochastic gravitational-wave background
with the TianQin Observatory. We consider sources of both astrophysical and cosmological …

The Laser Interferometer Space Antenna (LISA) mission, scheduled for launch in the early
2030s, is a gravitational wave observatory in space designed to detect sources emitting in …

A wide variety of astrophysical and cosmological sources are expected to contribute to a
stochastic gravitational-wave background. Following the observations of GW150914 and …

Quantum fluctuations of the gravitational field in the early Universe, amplified by inflation,
produce a primordial gravitational-wave background across a broad frequency band. We …

Beyond individually resolvable gravitational wave events such as binary black hole and
binary neutron star mergers, the superposition of many more weak signals coming from a …

Ultralight bosons, which are predicted in a variety of beyond-Standard-Model scenarios as
dark-matter candidates, can trigger superradiant instability around spinning black holes …

Detection of primordial gravitational-wave backgrounds generated during the early Universe
phase transitions is a key science goal for future ground-based detectors. The rate of …

Ultralight bosons with masses in the range 10-13 eV≤ mb≤ 10-12 eV can induce a
superradiant instability around spinning black holes (BHs) with masses of order 10− 100 …