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Can accelerating black holes radiate their mass as an gravitational wave?If that is true maybe dark matter is not something but it is just gravitational waves from an exhausted dense object.

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    $\begingroup$ It's a wild leap from your first sentence to your second one. Doing science requires a step-by-step approach, and not wild guesses. You'll learn more doing the step-by-step approach. It's faster in the long run. $\endgroup$ – StephenG Sep 28 '19 at 23:49
  • $\begingroup$ @StephenG since we cant isolate dark matter , then guesses are acceptable and specially guesses which are based on the laws of physics. $\endgroup$ – Bright Future Sep 28 '19 at 23:50
  • $\begingroup$ Physics is not a guessing game. If you had read more about the reasons dark matter has been postulated to exist you would understand that no guessing is involved. It's about experiment and developing (methodically) a mathematical model to match results. $\endgroup$ – StephenG Sep 29 '19 at 0:39
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    $\begingroup$ If you read about dark matter you would understand how we make measurements that show it seems to be required to explain what we measure. You do not even seem to have read Wikipedia's page on the subject (pretty much the minimum we expect posters to do prior to asking questions on science related SEs) which has a lot about observational evidence. $\endgroup$ – StephenG Sep 29 '19 at 2:53
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    $\begingroup$ Note that the first sentence actually does contain a good question with a nontrivial answer, but the stuff about the dark matter made me downvote it. $\endgroup$ – Anders Sandberg Sep 29 '19 at 8:16
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Since we know reasonably well that "normal" (stellar sized) black holes do not contribute significantly to dark matter and that the source of energy for gravitational waves is the mass/energy of those black holes when they are in binary systems, then it's hard to how such gravitational waves can contribute to dark matter, especially as they are only emitted significantly in the last moments of a black hole merger.

The assertion that black holes radiate gravitational waves when they accelerate isn't quite right. It is a necessary condition, but there needs to be an accelerating quadrupole mass moment, and an isolated black hole cannot emit gravitational waves.

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