Id not heard of acoustic metrics and acoustic horizons. Where can I read more about them?
It’s still a comparatively new subject. For a general audience, I uploaded a page on acoustic metrics, on Wikipedia, which might be considered to represent some sort of a community-consensus view – anyone can edit it, but it hasn’t been changed much since, other than someone adding some scary-looking equations. For the more technically-minded, Barcelo, Liberati and Visser’s review paper at LANL http://xxx.lanl.gov/abs/gr-qc/0505065 references an awful lot of recent papers on the topic.
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