Gravitational wave background
The gravitational wave background is a random gravitational-wave signal potentially detectable by gravitational wave detection experiments. Since the background is supposed to be random it is completely determined by its statistical properties such as mean, variance etc.Detection
On 11 February 2016, the LIGO and Virgo collaborations announced the first direct detection and observation of gravitational waves, which took place in September 2015. In this case, two black holes had collided to produce detectable gravitational waves. This is the first step to discovery of the GWB.
