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Forum » SpaceEngine » Science and Astronomy Discussions » Simulations of Binary Black Hole Mergers
Simulations of Binary Black Hole Mergers
WatsisnameDate: Friday, 07.11.2014, 06:52 | Message # 1
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https://medium.com/the-phy....d5b8498
http://arxiv.org/pdf/1410.7775v1.pdf

Neat little paper published recently on visualizing what it would look like to watch two co-orbiting black holes coalesce, with proper GR treatment of light paths. Simulating this is computationally difficult, since orbital motion is so fast that you must take the finite speed of light into account. That is, you can't calculate a geodesic for a frame, then evolve the system a little bit, and calculate again. Paths and system evolution must be integrated together, and within the framework of relativistic equations, that means using supercomputers.

Some pretty interesting effects emerge out of this, including multiple "fractal-like" images of one black hole lensed by the other. Photons can make several orbits very close to the horizons and still reach the camera/viewer. The author's also explore black holes with non-zero spin.

It is unlikely that we will have the capabilities of actually observing these effects in nature any time soon (suitable candidates are expected to be rare and far away, and current resolution capability is way too small), but being able to pull them out of the equations is very cool. smile

Edit: Fixed links, maybe for real this time.





 
anonymousgamerDate: Friday, 07.11.2014, 06:57 | Message # 2
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Both of those links 404 for me.

Here are some simulations made by the same guys who published those papers:

https://www.youtube.com/watch?v=ENd8Sz0AFOk

https://www.youtube.com/watch?v=Qg6PwRI2uS8

https://www.youtube.com/watch?v=ZsODZW0VuhQ





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WatsisnameDate: Friday, 07.11.2014, 07:09 | Message # 3
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Fixed. And thanks for those youtube vids! The one showing the event-horizons during the merger was amazing (though I wish they'd replayed the last moments slowed down a bit). Seeing the horizons "leap out" at each other is something I'd always expected intuitively, but the way it actually looks is even stranger.




 
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