Massive Particles in Sonic & Slow Light Black Holes

[luke m]

I am working on a research project where I intend to describe what the Penrose process would like in a sonic black hole. I have found what a rotating (Kerr) black hole looks like in the sonic analog:
https://arxiv.org/pdf/1802.08306.pdf
I have also found that the analog of massless particles would be phonons:
https://arxiv.org/ftp/arxiv/papers/1510/1510.00621.pdf
The Penrose process requires massive particles to my understanding, what is the analog of this in a sonic black hole? If this is not possible in a sonic black hole, would it be possible in a different type of analog, like a slow light black hole?
Slow light black holes: https://arxiv.org/pdf/gr-qc/0303028.pdf

 

[PAllen]

Per your last reference, slow light cannot be used as an analog for quantum features of black holes. In fact, I was at a talk by Unruh on black hole analogs, and asked him this question (without knowing he had previously considered, analyzed, and rejected this possibility). He briefly explained the issues with it. At the time, I was really impressed with how he dealt with the question. Per your reference, I now see he had previously considered this!

 

[PAllen]

Per your last reference, slow light cannot be used as an analog for quantum features of black holes. In fact, I was at a talk by Unruh on black hole analogs, and asked him this question (without knowing he had previously considered, analyzed, and rejected this possibility). He briefly explained the issues with it. At the time, I was really impressed with how he dealt with the question. Per your reference, I now see he had previously considered this!

On the other hand, the Penrose process can be treated as purely classical, so slow light analogs may be workable. I just don’t know.