Quantum gravitational corrections at third-order curvature, acoustic analog black holes and their quasinormal modes

Quasinormal modes for bosonic (scalar, electro- magnetic, and axial gravitational) and fermionic field per- turbations, radiated from black holes that carry quantum gravitational corrections at third order in the curvature to the Schwarzschild solution, are scrutinized from the prop- agation of analog transonic sound waves across a de Laval nozzle. The thermodynamic variables, the nozzle geometry, the Mach number, and the thrust coefficient are computed as functions of the parameter driving the effective action for quantum gravity containing a dimension-six local operator beyond general relativity. The quasinormal modes for quan- tum gravitational corrected analog black holes are also deter- mined for higher overtones, yielding a more precise descrip- tion of the quantum-corrected ringdown process and the grav- itational waveform way before the fundamental mode sets in.