Astrophysical stochastic gravitational wave background

The stochastic gravitational wave background produced by supernovas, magnetars, and merger of binaries constituted of a pair of compact objects is reviewed and updated. The merger of systems composed of two black holes dominates by far the background signal, whose amplitude in the range 10–100 Hz is above the sensitivity of the planned Einstein laser interferometer (ET). The background signal at 25 Hz estimated by the laser interferometric gravitational observatory (LIGO)‐VIRGO collaboration, based on the available merger detection data, is in good agreement with the present theoretical predictions.