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Sound waves on a fluid stream, in a de Laval nozzle, are shown to correspondto quasinormal modes emitted by black holes that are physical solutions in aquadratic curvature gravity with cosmological constant. Sound waves patterns intranssonic regimes at a laboratory are employed here to provide experimentaldata regarding generalized theories of gravity, comprised by the exact deSitter-like solution and a perturbative solution around the Schwarzschild-deSitter standard solution. Using the classical tests of General Relativity tobound free parameters in these solutions, acoustic perturbations on fluid flowsin nozzles are then regarded to study quasinormal modes of these black holessolutions, providing deviations of the de Laval nozzle cross-sectional area,when compared to the Schwarzschild solution. The fluid sonic point in thenozzle, for sound waves in the fluid, implements the acoustic event horizoncorresponding to quasinormal modes.

Quadratic curvature terms and deformed Schwarzschild-de Sitter black hole analogues in the laboratory