Gravitational waves that are detected by the current detectors are of long wavelengths and are hence low on energy, but during the initial phase of the universe high energetic phenomena like cosmic strings may have given rise to GWs with high energy. So, what could have been the upper bound for the energy of this waves during that time.
GW are produced typically under close rotation of two very heavy masses, like two black holes.
Never heard yet about origin from Cosmic Rays. This sound unlikely to me.(cannot imagine a mechanism).
Very high energy cosmic rays are thought to be a product of decay of some heavy particle.
When energetic cosmic rays come, all that happens are important particle showers, muons that in turn
decay into other particles.
It’s negligible, since cosmic rays don’t affect the geometry of spacetime through which they propagate.
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