The stochastic gravitational-wave background (SGWB) is by far the most difficult source of gravitational radiation detect. At the same time, it is the most interesting and intriguing one. This book describes the initial detection of the SGWB and describes the underlying mathematics behind one of the most amazing discoveries of the 21st century. On the experimental side, detecting the SGWB would mean that interferometric gravitational-wave detectors work better than expected and on the observational side, and we could learn more about the very early universe.
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