[HN Gopher] Researchers observe stationary Hawking radiation in ...
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       Researchers observe stationary Hawking radiation in an analog black
       hole
        
       Author : dnetesn
       Score  : 14 points
       Date   : 2021-02-20 11:45 UTC (11 hours ago)
        
 (HTM) web link (phys.org)
 (TXT) w3m dump (phys.org)
        
       | cmrdsprklpny wrote:
       | I was confused as to how the researchers created a black hole in
       | a lab, which I hadn't heard of being done before. As far as I can
       | tell, an "analog" black hole is different from a normal black
       | hole in that it doesn't use gravity and only works on acoustic
       | waves or electromagnetic waves, depending on the type [1]. That
       | said I don't really get what's going on.
       | 
       | I'd be curious if someone who actually knows what they're talking
       | about could try to clarify how the researchers have a black hole
       | here.
       | 
       | EDIT: There's a link[2] to another article at the bottom that
       | describes how the researchers are simulating a black hole. My bad
       | for not catching this earlier.
       | 
       | [1]: http://www.phy.olemiss.edu/~luca/Topics/bh/analog.html [2]:
       | https://phys.org/news/2014-10-mimic-hawking-lab.html
        
         | ojnabieoot wrote:
         | Yes, I think it might have been more straightforward to say
         | "Researchers observe stationary Hawking radiation in 'acoustic
         | black hole'" or something to clarify to laypeople that this is
         | a mathematically analogous but physically very different
         | experiment. I don't think it's too difficult to conceptualize
         | that sound waves behave similarly to light waves and that
         | properties of black holes can be "simulated" with sound.
        
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