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the claim
Sound is a classical mechanical phenomenon rather than a quantum effect
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Standard reference texts categorize acoustics and sound propagation under classical mechanics rather than quantum effects.

Evidence for · 3
2025 · cited by 5
Bloch wavefunctions in crystals experience localization within the bulk when disorder is introduced, a phenomenon commonly known as Anderson localization. This effect is considered universal, being applicable to all types of waves, quantum or classical. However, the interaction between disorder and topology-a concept that has profoundly transformed many branches of physics-necessitates revisiting the original Anderson localization picture. For instance, in the recently discovered topological Anderson insulator, the introduction of disorder induces topological boundary states that can resist localization due to protection from line-gap topology. While line-gap topology applies to both Hermitian and non-Hermitian systems, non-Hermitian systems uniquely exhibit point-gap topology, which has no Hermitian counterparts and leads to the non-Hermitian skin effect. Here, we experimentally demonstrate disorder-induced point-gap topology in a non-Hermitian acoustic crystal. This crystal, with non-Hermitian disorder in nearest-neighbor couplings, exhibits the non-Hermitian skin effect, where all eigenstates localize at a boundary. Interestingly, the boundary where localization occurs-either the left or right-depends on the strength of the disorder. As the disorder strength increases, the direction of boundary localization can be reversed. Additionally, we observe a "bipolar" skin effect, where boundary localization occurs at both the left and right boundaries when disorder is introduced in next-nearest-neighbor couplings. These findings experimentally reveal a non-Hermitian mechanism of disorder-induced localization that goes beyond the conventional framework of Anderson localization.
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Hawking Radiation from Acoustic Black Holes, Short Distance and Back-Reaction Effects Using the action principle we first review how linear density perturbations (sound waves) in an Eulerian fluid obey a relativistic equation: the d'Alembert equation. This analogy between propagation of sound and that of a massless scalar field in a Lorentzian metric also applies to non-homogeneous flows. In these cases, sound waves effectively propagate in a curved four-dimensional ''acoustic'' metric whose properties are determined by the flow. Using this analogy, we consider regular flows which become supersonic, and show that the acoustic metric behaves like that of a black hole. The analogy is so good that, when considering quantum mechanics, acoustic black holes should produce a thermal flux of Hawking phonons. We then focus on two interesting questions related to Hawking radiation which are not fully understood in the context of gravitational black holes due to the lack of a theory of quantum gravity.
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- Celestial mechanics, motions of planets and other astronomical objects - Solid mechanics, elasticity, the properties of (semi-)rigid bodies - Acoustics, sound in solids, fluids, etc. - Hydraulics, fluids in equilibrium - Applied / Engineering mechanics - Statistical mechanics, large assemblies of particles - Relativistic or Einsteinian mechanics, universal gravitation Newton Newton proposed three laws of motion. - An object will stay at a constant speed unless a force acts on it. - F= Ma: the overall force acting on an object is the mass of the object times the object's acceleration. - For every action there is an equal but opposite reaction. Quantum mechanics The following are categorized as being part of Quantum mechanics: - Particle physics, the motion, structure, and reactions of particles - Nuclear physics, the motion, structure, and reactions of nuclei - Condensed matter physics, quantum gases, solids, liquids, etc. - Quantum statistical mechanics, large assemblies of particles
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  1. arXiv: Hawking Radiation from Acoustic Black Holes, Short Distance and Back-Reaction Effectspeer-reviewedno side taken
  2. Simple English Wikipedia: Mechanicsreferenceno side taken
  3. Observation of disorder-induced boundary localization.peer-reviewedno side taken
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