So a spherically symmetric object, by Birkhoff's theorem, does not emit gravitational waves.(adsbygoogle = window.adsbygoogle || []).push({});

Is this why we look to binaries, so that there is some rotation of the objects with respect to each other breaking the spherical symmetry? Or mainly because the gravitational radiation is much greater as needed, or is it both reasons?

What single sources, if the sensitivity of detectors was sufficient enough, would emit gravitational waves . Like a single rotating black hole? (or is this spherically symmetric, if it rotates in a certain way)?

Thanks in advance

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# A Why binary systems for gravitational waves?

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