![]() ![]() ![]() We have tried to make the article as self-contained and comprehensive as possible, targeting graduate students and new researchers looking to enter this field. Pedagogical examples are given whenever possible to compare and contrast different approaches. We provide a unified treatment of these searches at the level of detector response functions, detection sensitivity curves, and, more generally, at the level of the likelihood function, since the choice of signal and noise models and prior probability distributions are actually what define the search. Our focus is on relevant data analysis issues, and not on the particular astrophysical or early Universe sources that might give rise to such backgrounds. We consider both Bayesian and frequentist searches using ground-based and space-based laser interferometers, spacecraft Doppler tracking, and pulsar timing arrays and we allow for anisotropy, non-Gaussianity, and non-standard polarization states. We review detection methods that are currently in use or have been proposed to search for a stochastic background of gravitational radiation. ![]()
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