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+--- Thread: Rare 'gravitational lasers' could exist throughout the universe, paper claims (/thread-15442.html)
Rare 'gravitational lasers' could exist throughout the universe, paper claims - C C - Feb 14, 2024
https://www.livescience.com/space/black-holes/einsteins-predictions-mean-rare-gravitational-lasers-could-exist-throughout-the-universe-new-paper-claims
EXCERPTS: Among his many theoretical insights, Albert Einstein predicted the existence of two phenomena in our universe that have since been proved: gravitational waves and the stimulated emission of radiation. New research has found that these effects can sometimes combine into rare and exotic "gravitational lasers" — possibly leading to a new way to detect one of the most elusive substances in the universe.
[...] In a paper posted in January to the preprint database arXiv, Jing Liu, a physicist at the University of Chinese Academy of Sciences in Beijing, suggests that gravity itself could be channeled into a cosmic laser beam — but only if a certain model of dark matter (the mysterious, invisible substance that makes up an estimated 85% of the matter in the universe) is true.
[...] While powerful, these gravitational lasers would be very rare. ... If we see them, it would be solid evidence that dark matter exists in the form of axions — and that our universe is awesome enough to permit the existence of gravitational lasers... (MORE - missing details)