Ray tracing in rotating acoustic black holes yields a shadow centroid shifting linearly with circulation plus left-right redshift tilt and branch-dependent flux imbalance as key differential observables.
Steinhauer, Observation of self-amplifying Hawking radi- ation in an analogue black-hole laser, Nature Phys.10, 864 (2014)
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Transfer observables of rotating acoustic black holes from ray tracing: shadow centroid, redshift asymmetry and flux imbalance
Ray tracing in rotating acoustic black holes yields a shadow centroid shifting linearly with circulation plus left-right redshift tilt and branch-dependent flux imbalance as key differential observables.